All tools
624 tools across 26 categories · 804 direct converters
Convertto is a catalogue of 624 free conversion and generation tools covering files, text, data, code, units, colour and media. Every one of them runs in your browser, so files are never uploaded, there is no sign-up and there is no size limit. Pick a category below, or search if you know what you need.
Unit Converters
Category page →Angle ConverterConvert angle between 7 units with the formula, a reverse conversion and a quick-reference table.Area ConverterConvert area between 10 units with the formula, a reverse conversion and a quick-reference table.Clothing Size ConverterConvert clothing size between 6 units with the formula, a reverse conversion and a quick-reference table.Cooking Measurement ConverterConvert cooking measurement between 10 units with the formula, a reverse conversion and a quick-reference table.Data Storage ConverterConvert data size between 11 units with the formula, a reverse conversion and a quick-reference table.Data Transfer Rate ConverterConvert transfer rate between 8 units with the formula, a reverse conversion and a quick-reference table.Density ConverterConvert density between 6 units with the formula, a reverse conversion and a quick-reference table.Energy ConverterConvert energy between 9 units with the formula, a reverse conversion and a quick-reference table.Force ConverterConvert force between 6 units with the formula, a reverse conversion and a quick-reference table.Frequency ConverterConvert frequency between 6 units with the formula, a reverse conversion and a quick-reference table.Fuel Economy ConverterConvert fuel economy between 5 units with the formula, a reverse conversion and a quick-reference table.Illuminance ConverterConvert illuminance between 5 units with the formula, a reverse conversion and a quick-reference table.Length ConverterConvert length between 14 units with the formula, a reverse conversion and a quick-reference table.Power ConverterConvert power between 7 units with the formula, a reverse conversion and a quick-reference table.Pressure ConverterConvert pressure between 10 units with the formula, a reverse conversion and a quick-reference table.Shoe Size ConverterConvert shoe size between 7 units with the formula, a reverse conversion and a quick-reference table.Speed ConverterConvert speed between 7 units with the formula, a reverse conversion and a quick-reference table.Temperature ConverterConvert temperature between 5 units with the formula, a reverse conversion and a quick-reference table.Time ConverterConvert time between 11 units with the formula, a reverse conversion and a quick-reference table.Torque ConverterConvert torque between 5 units with the formula, a reverse conversion and a quick-reference table.Volume ConverterConvert volume between 16 units with the formula, a reverse conversion and a quick-reference table.Weight & Mass ConverterConvert weight between 12 units with the formula, a reverse conversion and a quick-reference table.
Number Tools
Category page →Binary to Decimal ConverterConvert binary numbers to decimal, hex and octal instantly.Fraction to Decimal ConverterConvert fractions to decimals and decimals back to simplified fractions.Hex to Decimal ConverterConvert hexadecimal values to decimal, binary and octal.Number Base ConverterConvert numbers between any base from 2 to 36 — binary, octal, decimal, hexadecimal and beyond.Number to Words ConverterSpell out numbers in English words — for cheques, contracts and invoices.Octal to Decimal ConverterConvert octal numbers to decimal, binary and hexadecimal.Ordinal Number ConverterConvert numbers to ordinals — 1st, first, primary, Roman — with the irregular cases right.Percentage ConverterConvert between percentages, decimals, fractions, ratios and basis points.Roman Numeral ConverterConvert numbers to roman numerals and roman numerals back to numbers, from 1 to 3999.Scientific Notation ConverterConvert between standard decimal numbers and scientific or engineering notation.Words to Number ConverterConvert written English numbers back into digits — "two hundred and fifty" becomes 250.
Text Tools
Category page →Acronym GeneratorTurn a phrase into an acronym or initialism, with control over small words and separators.Add Line NumbersPrefix every line with a sequential number, with a custom start, separator and zero padding.ASCII Art Text GeneratorTurn words into large ASCII banner text for terminals, READMEs and code comments.ASCII Table FormatterTurn CSV or tab-separated text into an aligned plain-text, Markdown or box-drawing table.AZW3 to EPUB ConverterConvert Kindle AZW3 format to open EPUB format.Bionic Reading ConverterBold the leading letters of each word to guide the eye through long text.Case ConverterConvert text to UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case and more.Checklist to MarkdownTurn a plain list into Markdown task lists, HTML checkboxes or a numbered outline.Columns to Lines ConverterSwitch between a delimited single line and one item per line, in either direction.Email, URL & Number ExtractorPull emails, URLs, IP addresses, phone numbers or hashtags out of any text.DOC to DOCX ConverterRebuild a mislabelled or malformed .doc as a clean, modern .docx.DOCX to DOC ConverterSave a Word document in the legacy format older software can open.EPUB to HTML ConverterExtract chapter HTML markup from EPUB files.EPUB to PDF ConverterConvert EPUB e-books into printable PDF documents.EPUB to Text ConverterExtract plain text from EPUB e-books.EPUB to Word ConverterConvert EPUB e-books into editable Word (.docx) documents.Fancy Text GeneratorConvert text into bold, italic, script, monospace and double-struck Unicode styles.Find and Replace TextReplace text across a whole document with plain matching or full regular expressions.Glitch Text GeneratorCreate corrupted Zalgo-style glitch text using stacked Unicode combining marks.HTML to EPUB ConverterPackage HTML articles into a valid, reflowable EPUB 3 ebook.HTML to JPG ImageRender self-contained HTML into a JPG image.HTML to JSON ParserParse an HTML document into a structured JSON tree of tags, attributes and text.HTML to Markdown ConverterConvert HTML into clean, readable Markdown.HTML to PNG ImageRender self-contained HTML into a lossless PNG screenshot.HTML to SVG ConverterWrap HTML into a scalable SVG with the markup kept as live content.HTML to Plain TextStrip HTML tags and extract readable text with the paragraph breaks intact.HTML to Word ConverterConvert HTML into a real Word document with heading styles and tables.HTML to XML ConverterConvert HTML into well-formed XHTML that an XML parser will accept.Leetspeak ConverterConvert normal text into 1337 5p34k, with light or heavy substitution.Letter Frequency AnalyserCount letter and character frequencies — useful for cryptograms and puzzle solving.Line SorterSort lines alphabetically, numerically, by length or in reverse — with natural-order support.Wrap Lines in Quotes or BracketsAdd a prefix and suffix to every line and join them — build SQL IN lists, arrays and CSV rows.List Comparison & Set OperationsFind items in both lists, in one only, or combined — union, intersection and difference.List Randomizer & ShufflerShuffle a list into random order — for draws, pairings, running orders and sampling.Markdown Editor & ViewerWrite markdown with a live preview, outline, formatting toolbar and one-click HTML, PDF or .md export.Markdown to DOCX ConverterExport Markdown as a DOCX with Word heading styles, lists and grid tables.Markdown to JSON ConverterParse Markdown into a structured JSON document tree with headings, lists and tables.Markdown to Presentation SlidesTurn a Markdown outline into a real PowerPoint deck — one slide per heading.Markdown to Plain TextStrip Markdown formatting down to clean, readable plain text.Markdown to Word ConverterConvert Markdown into a real, editable Word (.docx) document with proper heading styles.MOBI to EPUB ConverterConvert Kindle MOBI books into universal EPUB format.MOBI to PDF ConverterConvert Kindle MOBI files to PDF.Morse Code TranslatorTranslate text to Morse code and decode Morse back to plain text, letters and numbers included.NATO Phonetic Alphabet ConverterSpell any word using the NATO phonetic alphabet — Alfa, Bravo, Charlie — for clear radio and phone use.Pig Latin TranslatorConvert English to Pig Latin and back, with both the classic and consonant-cluster rules.Readability Score CheckerScore text with Flesch, Gunning Fog, SMOG, Coleman-Liau and ARI, and see the reading age.Remove Accents & DiacriticsConvert accented characters to plain ASCII — café becomes cafe, naïve becomes naive.Remove Duplicate LinesDelete repeated lines from a list, keeping the first occurrence of each unique line.Remove Line BreaksTurn multi-line text into a single line, joining with a space, comma or custom separator.Sentence SplitterBreak a paragraph into one sentence per line, handling abbreviations and decimals correctly.URL Slug GeneratorTurn any title into a clean, SEO-friendly URL slug with accents stripped and symbols removed.String Byte Size CalculatorMeasure text in UTF-8, UTF-16 and UTF-32 bytes, code points and grapheme clusters.String Escaper & UnescaperEscape strings for JSON, JavaScript, CSV, SQL, XML or shell — and unescape them again.Text CleanerStrip smart quotes, invisible characters, ligatures and stray whitespace pasted from Word or a PDF.Text Padding ToolPad every line to a fixed width with any character, on the left, right or both sides.Text RepeaterRepeat any text a set number of times, separated by newlines, spaces or nothing.Text ReverserReverse text by character, word or line — useful for puzzles, testing and mirrored strings.Text ShufflerRandomly reorder lines, words, sentences or characters, with a seed for repeatable results.Text Similarity CheckerCompare two texts with Levenshtein distance, Jaccard, cosine and Dice coefficients.Word & Character Frequency CounterCount how often each word, character or line appears in your text.Text TruncatorShorten text to a character, word or sentence limit without cutting words in half.Text Wrap & TruncateHard-wrap text at a line width, or truncate it to a maximum length.Title Case ConverterApply AP, Chicago, APA or MLA title capitalisation rules — each treats small words differently.Upside Down Text GeneratorFlip text upside down using Unicode look-alike characters, readable when rotated 180°.Whitespace RemoverStrip extra spaces, tabs, blank lines and trailing whitespace from any text.Word & Character CounterCount words, characters, sentences and paragraphs, with reading time and readability.Word Frequency CounterCount how often each word appears, with stop-word filtering and a frequency chart.Word to EPUB ConverterTurn a Word document into a reflowable EPUB 3 ebook with chapters.Word to HTML ConverterConvert a Word document into clean, semantic HTML you can publish.Word to JPG ConverterRender the pages of a Word document as JPG images.Word to JSON ConverterParse a Word document into a structured JSON document tree.Word to Markdown ConverterConvert a Word document into Markdown with real headings, lists and tables.Word to PNG ConverterRender the pages of a Word document as lossless PNG images.Word to PowerPoint ConverterTurn a Word outline into a PowerPoint deck — one slide per heading.Word to RTF ConverterConvert a Word document into Rich Text Format that opens anywhere.Word to SVG ConverterRender Word pages as vector SVGs with live, selectable text.Word to Text ConverterExtract the plain text of a Word document with its structure intact.Word to XML ConverterConvert a Word document into clean structural XML.
Data & Format Tools
Category page →HTML, CSS & JS MinifierStrip whitespace and comments to shrink HTML, CSS and JavaScript for production.CSS, SCSS & Less FormatterFormat stylesheets with consistent indentation, spacing and property ordering.CSV AnalyserProfile a CSV: column types, missing values, ranges, distinct counts and outliers.CSV Column ExtractorPull selected columns out of a CSV by name or position, and reorder them.CSV Duplicate RemoverRemove duplicate rows from a CSV, matching on every column or just a key you choose.CSV Merger & JoinerJoin two CSV files on a shared key, or stack them, with inner, left and outer joins.CSV SplitterSplit a CSV into chunks of N rows, or into separate files grouped by a column value.CSV to Excel ConverterConvert CSV data into a real .xlsx workbook.CSV Viewer & Table ConverterView CSV data as a sortable table and export it as JSON or a Markdown table.cURL to Code ConverterTurn a cURL command into fetch, axios, Python requests or Node.js code.CSV Data AnonymiserMask, hash or replace personal data in a CSV so it can be shared safely.Data Format ConverterConvert between JSON, YAML, XML, CSV, TSV and TOML in any direction, locally in your browser..env to JSON ConverterConvert .env files to JSON and back — for config migrations and CI variables.Excel to CSV ConverterExport Excel sheets to properly quoted CSV.Excel to HTML ConverterConvert an Excel sheet into an HTML table.Excel to JSON ConverterConvert spreadsheet rows into a JSON array of objects.Excel to Markdown ConverterConvert an Excel sheet into a Markdown pipe table.Excel to ODS ConverterConvert an Excel workbook into an OpenDocument Spreadsheet for LibreOffice Calc.Excel to SQL ConverterGenerate CREATE TABLE and INSERT statements from a sheet.Excel to Text ConverterExtract a spreadsheet as plain, readable text.Excel to TSV ConverterExport an Excel sheet as tab-separated values.Excel to XML ConverterExport spreadsheet rows as XML with safe element names.Excel to YAML ConverterConvert spreadsheet rows into YAML.HTML FormatterFormat and indent HTML properly, preserving inline elements and whitespace sensitivity.INI & Config File ParserParse INI, .conf, .cfg and .properties files into structured JSON, YAML or TOML.JavaScript & TypeScript FormatterFormat JavaScript, TypeScript, JSX and TSX properly with Prettier.JSON DiffCompare two JSON documents and see exactly which keys were added, removed or changed.JSON FlattenerFlatten deeply nested JSON into dot-notation keys, or expand flat keys back into nested objects.JSON Formatter & ValidatorFormat, validate, repair and analyse JSON — with errors that point at the exact line.JSON MergeDeep-merge several JSON documents, choosing how arrays and conflicts are resolved.JSON Key SorterSort object keys and arrays in a JSON document to make two versions comparable.JSON to C# Model ConverterConvert JSON objects into strongly-typed C# Model definitions and data models.JSON to Dart Class ConverterConvert JSON objects into strongly-typed Dart Class definitions and data models.JSON to Go Struct ConverterConvert JSON objects into strongly-typed Go Struct definitions and data models.JSON to Java Class ConverterConvert JSON objects into strongly-typed Java Class definitions and data models.JSON to Kotlin Data Class ConverterConvert JSON objects into strongly-typed Kotlin Data Class definitions and data models.JSON to Mongoose Schema ConverterConvert JSON objects into strongly-typed Mongoose Schema definitions and data models.JSON to Prisma Model ConverterConvert JSON objects into strongly-typed Prisma Model definitions and data models.JSON to Python Dataclass ConverterConvert JSON objects into strongly-typed Python Dataclass definitions and data models.JSON to Rust Struct ConverterConvert JSON objects into strongly-typed Rust Struct definitions and data models.JSON to Swift Codable ConverterConvert JSON objects into strongly-typed Swift Codable definitions and data models.JSON to TypeScript ConverterGenerate TypeScript interfaces, Zod schemas, Go structs, Python dataclasses or Rust structs from JSON.JSON to Zod Schema ConverterConvert JSON objects into strongly-typed Zod Schema definitions and data models.JSON ValidatorCheck whether JSON is valid, with the precise position of the error and what usually causes it.JSONPath TesterRun JSONPath expressions against a document and see the matches instantly.Markdown FormatterTidy Markdown — normalise headings, lists, tables and emphasis markers.Markdown to HTML ConverterConvert Markdown to clean HTML, or turn existing HTML back into Markdown.ODS to Excel ConverterConvert a LibreOffice Calc spreadsheet into a Microsoft Excel workbook.Query String to JSON ConverterConvert URL query strings to JSON and build query strings from JSON objects.SQL FormatterFormat and indent SQL queries for MySQL, PostgreSQL, SQLite, SQL Server and BigQuery.CSV to Markdown TableTurn CSV, TSV or pasted spreadsheet data into a Markdown, HTML or reStructuredText table.Word to CSV ConverterExtract the tables from a Word document into CSV.Word to Excel ConverterExtract Word tables into an Excel workbook, one sheet per table.XLSX to PDF ConverterConvert an Excel workbook into a PDF of real tables, one section per sheet.XML FormatterFormat messy XML with proper indentation, or minify it back down, with well-formedness checked.XML ValidatorCheck XML is well-formed, with the exact line and column of the first error and a document summary.YAML Formatter & ValidatorFormat and validate YAML — catch the indentation mistakes that break CI pipelines.
Encoders & Decoders
Category page →Base32 Encoder & DecoderEncode and decode Base32 (RFC 4648) — used by TOTP secrets and case-insensitive identifiers.Base58 Encoder & DecoderEncode and decode Base58 — the Bitcoin alphabet that omits look-alike characters.Base64 Encoder & DecoderEncode and decode Base64 with automatic direction detection, plus file and data-URI support.Base64 to File ConverterDecode Base64, a data URI or hex back into a downloadable file, with the type detected automatically.Base64 to PDF ConverterDecode a Base64 string into a real, downloadable PDF file.Binary to Text ConverterTranslate text into binary ones and zeros, and decode binary back into readable text.Caesar Cipher EncoderEncrypt and decrypt text with a Caesar shift cipher, including ROT13.Data URI GeneratorTurn text, SVG or CSS into a data: URI you can inline directly in HTML or stylesheets.File to Base64 ConverterEncode any file — image, PDF, video, font, archive — as Base64, a data URI, hex or a byte array.Hex to Text ConverterConvert text to hexadecimal bytes and decode hex strings back into readable text.HTML Entity Encoder & DecoderConvert characters to HTML entities and back — escape markup safely for display.JWT DecoderDecode a JSON Web Token to inspect its header, payload and expiry — locally, never sent anywhere.Multi-Format EncoderEncode text into Base64, hex, binary, URL, HTML entities, ROT13 and more, all at once.PDF to Base64 ConverterEncode a PDF as a Base64 string or a data URI, ready to embed in code.Punycode ConverterConvert internationalised domain names to Punycode and decode xn-- domains back.Quoted-Printable Encoder & DecoderEncode and decode quoted-printable, the MIME format used in email bodies and headers.ROT13 & ROT-N CipherShift letters by any amount — ROT13, ROT47 and every rotation in between, with a full table.Unicode ConverterConvert text between code points, UTF-8, UTF-16, HTML entities and escape sequences.Unicode Escape ConverterConvert characters to \u escape sequences and back — for JSON, JavaScript and source code.URL Encoder & DecoderPercent-encode text for safe use in URLs, and decode encoded URLs back to readable text.UTF-8 Byte InspectorSee exactly how text is encoded — code points, UTF-8 bytes, names and byte counts per character.
Hash & Crypto Tools
Category page →AES Text EncryptorEncrypt and decrypt text with AES-256-GCM and a passphrase, entirely in your browser.Bcrypt Hash GeneratorHash a password with bcrypt at a configurable cost factor — the right way to store passwords.X.509 Certificate DecoderDecode a PEM certificate to see its subject, issuer, validity, SANs and key details.CRC32 Checksum CalculatorCalculate a CRC32 checksum — the fast error-detection code used in ZIP and PNG files.File Hash & Checksum CalculatorCompute SHA-256, SHA-384, SHA-512 or SHA-1 for any file and verify it against a checksum.HMAC GeneratorGenerate an HMAC signature with SHA-256, SHA-1, SHA-384 or SHA-512 and a secret key.htpasswd GeneratorCreate Apache and Nginx basic-auth credentials with bcrypt, SHA-1 or MD5-crypt.JWT SignerCreate a signed HS256, HS384 or HS512 JSON Web Token for testing, entirely in your browser.JWT VerifierVerify a JWT's HS256 signature and its expiry, issuer and audience claims, entirely in your browser.RSA & ECDSA Key Pair GeneratorGenerate an RSA or elliptic-curve key pair in your browser, exported as PEM or JWK.MD5 Hash GeneratorGenerate an MD5 hash from any text — instantly and entirely in your browser.Nano ID GeneratorGenerate compact URL-safe unique IDs — shorter than a UUID with comparable collision safety.Passphrase GeneratorGenerate memorable Diceware-style passphrases from random words.Password GeneratorGenerate strong random passwords using your browser's cryptographic random source.Password Policy TesterTest a password against a policy and see whether the policy actually improves security.Password Strength CheckerEstimate how long a password would take to crack, and see exactly what weakens it.Random String GeneratorGenerate random strings from a chosen character set — for keys, tokens and test data.SHA-1 Hash GeneratorGenerate a SHA-1 hash from text — 160-bit digest, computed locally.SHA-256 Hash GeneratorGenerate a secure SHA-256 hash from any text, in hex and Base64.SHA-384 Hash GeneratorGenerate a SHA-384 hash — a truncated SHA-512 used in TLS cipher suites.SHA-512 Hash GeneratorGenerate a 512-bit SHA-512 hash — the widest digest in the SHA-2 family.SSH Key Fingerprint CalculatorCompute the SHA-256 and MD5 fingerprints of an OpenSSH public key and read its details.TOTP Code GeneratorGenerate time-based one-time passwords from a Base32 secret to test 2FA setups.UUID v4 GeneratorGenerate random RFC 4122 version 4 UUIDs in bulk.UUID v7 GeneratorGenerate time-sortable UUID version 7 identifiers — ideal as database primary keys.
Image Tools
Category page →Aspect Ratio CalculatorWork out the aspect ratio of any dimensions and scale them proportionally.AVIF ConverterConvert images to and from AVIF in your browser, with a real encoder check so you never get a PNG renamed to .avif.Business Card OCRRecognize contact name, email, phone, and organization from business cards.Circle Crop an ImageCrop any photo into a circle, square, rounded square, hexagon or heart.EXIF RemoverStrip all metadata — including GPS location — from photos before sharing them.Favicon GeneratorTurn any image into a complete favicon set with all the sizes modern browsers expect.Handwriting to Text OCRConvert handwritten notes and letters into clean digital text.HEIC to Text OCRExtract text from iPhone HEIC photos directly in the browser.ID Card OCR ReaderExtract details from national identity card photos.Add a Border to an ImageAdd a solid, gradient or photo-style border, and round the corners of any image.Image CompressorDrop an image, see its current size and dimensions auto-detected, then set your targets and compress.Image ConverterConvert images between PNG, JPG, WebP and AVIF without uploading them anywhere.Image CropperCrop images visually with drag handles, aspect-ratio presets and a live preview.Image Filter EffectsApply grayscale, sepia, blur, brightness, contrast and invert effects to images.Image Metadata & EXIF ViewerInspect EXIF data, camera settings, GPS coordinates and dimensions inside an image.Image Colour Palette ExtractorPull the dominant colours out of any image as HEX and RGB values.Image ResizerResize images by size, percentage or a social-media preset visually in the interactive UI editor or in bulk.Image Rotator & FlipperRotate images by 90, 180 or 270 degrees and mirror them horizontally or vertically.Image SplitterCut an image into an even grid of tiles — for Instagram grids and sprite sheets.Image to ASCII Art ConverterTurn any picture into ASCII art with adjustable width and character sets.Image to Text OCRExtract text from any image (PNG, JPG, WebP, HEIC) using browser OCR.Image UpscalerDrop an image, see its current size auto-detected, set your target width, height or file size and enlarge.Add a Watermark to ImagesStamp text or a logo across your images, one at a time or a whole batch.Invoice to Excel OCRExtract invoice items and text from scanned invoices.JPG to Text OCRConvert JPG photos and screenshots into copyable plain text.Math Image to LaTeX OCRExtract equations and mathematical formulas from images into LaTeX format.Meme GeneratorAdd classic top and bottom meme captions to any image, with an outline that stays readable.Passport OCR ReaderRead and extract Machine Readable Zone (MRZ) and text from passport images.Paste Image and DownloadPress Ctrl+V to paste a screenshot or copied image, then download it as a real file. Nothing is uploaded.PDF OCR ExtractorPerform optical character recognition on scanned PDFs to extract text.Photo Collage MakerCombine several photos into one image: a grid, a horizontal strip or a vertical stack.PNG to Text OCRExtract text from PNG screenshots and documents accurately.Receipt to Text OCRExtract store names, prices, items, and totals from receipt photos.Scanned PDF to ExcelOCR tabular data from scanned PDFs into structured text.Scanned PDF to TextExtract plain text from scanned PDF pages.Scanned PDF to WordOCR scanned PDF documents into copyable text format.SVG OptimizerStrip editor cruft and optimise path data to cut SVG file size, usually by half or more.SVG to PNG ConverterRasterise an SVG to PNG, JPG or WebP at whatever resolution you need.WebP to Text OCRRecognize and extract text from WebP images.
PDF Tools
Category page →Add Page Numbers to PDFNumber the pages of a PDF with a custom start, position and format.Compare Two PDFsSee two versions side by side, overlaid or wiped between — with every changed area outlined.Compress PDFReduce PDF file size by re-rendering pages at a lower resolution and quality.Crop PDFTrim the margins of every page, or just the pages you choose, without re-rendering.Delete PDF PagesRemove unwanted pages from a PDF and keep everything else intact.Duplicate PDF PagesRepeat chosen pages any number of times — for labels, tickets, forms or handouts.Edit PDFAdd text, pictures, shapes, arrows, highlights and freehand drawing to any PDF page.Excel to PDFConvert an Excel workbook to a PDF table, one section per sheet, in your browser.Extract PDF PagesPull specific pages out of a PDF into a new document, in one file or one file per page.Fill PDF FormsRead a PDF's interactive form fields, fill them in, and optionally lock the answers.Flatten PDF FormsTurn fillable form fields into fixed page content so nobody can edit the answers.HTML to PDFConvert HTML markup into a clean, text-based PDF document in your browser.Image to PDF ConverterCombine JPG, PNG or WebP images into a single PDF document.Insert Blank PDF PagesAdd blank pages at chosen positions — for double-sided printing, notes or separators.Markdown to PDFTurn Markdown into a properly typeset PDF with real headings, lists, tables and code blocks.Merge PDFCombine several PDF files into one document, in your browser and without uploading.OCR PDFRecognise the text in a scanned PDF and add it as an invisible, selectable layer over the original pages.Create a Fillable PDF FormPlace real text fields and checkboxes onto a PDF so other people can fill it in.PDF Metadata Editor & RemoverSee what a PDF reveals about you, then rewrite it or strip it out entirely.PDF Metadata ViewerInspect a PDF's title, author, producer, creation date and page dimensions.PDF Page OrganiserSee every page as a thumbnail, then drag to reorder, rotate and remove pages before saving.PDF Text ExtractorPull all the text out of a PDF as plain text you can search, copy or reuse.PDF to BMP ConverterConvert PDF pages into uncompressed 24-bit BMP bitmaps.PDF to CSV ConverterExtract PDF tables into properly quoted CSV, one row per table row.PDF to DOCX ConverterExport PDF document content into 100% editable Microsoft Word DOCX format.PDF to Ebook ConverterTurn a PDF into a reflowable ebook you can read comfortably on a phone or e-reader.PDF to EPUB ConverterConvert a PDF into a real, reflowable EPUB 3 ebook with a chapter list.PDF to Excel ConverterExtract real tables from a PDF into an Excel workbook — columns detected, numbers kept numeric.PDF to GIF ConverterConvert PDF pages into GIFs, or the whole document into one looping animation.PDF to HEIC ConverterConvert PDF pages into HEIC, or the closest modern equivalent your browser can encode.PDF to HTML ConverterConvert a PDF into clean semantic HTML with real headings, paragraphs and tables.PDF to Image ConverterConvert PDF pages into PNG or JPG images at any resolution.PDF to JPG ConverterConvert PDF pages into JPG images at any resolution, in your browser.PDF to JSON ConverterExport a PDF as JSON — both the recovered document structure and the raw line geometry.PDF to LaTeX ConverterConvert a PDF into a compilable LaTeX document with sections and tabular environments.PDF to Markdown ConverterConvert a PDF into Markdown with proper headings and pipe tables.PDF to ODP ConverterConvert PDF pages into an OpenDocument Presentation for LibreOffice Impress.PDF to ODS ConverterConvert PDF tables into an OpenDocument Spreadsheet for LibreOffice Calc.PDF to ODT ConverterConvert a PDF into OpenDocument Text for LibreOffice Writer.PDF to PNG ConverterConvert PDF pages into crisp lossless PNG images.PDF to PowerPoint ConverterTurn PDF pages into PowerPoint slides with editable title and body text.PDF to PPTX ConverterConvert PDF pages into a real .pptx presentation, one slide per page.PDF to PostScript ConverterConvert a PDF into DSC-conformant PostScript for a printer or an RIP.PDF to RTF ConverterConvert PDF text into Rich Text Format that opens in any word processor.PDF to SVG ConverterConvert PDF pages into true vector SVGs with live, selectable text.PDF to Text ExtractorExtract the text of a PDF with paragraphs rebuilt and hyphenation repaired.PDF to TIFF ConverterConvert a whole PDF into one multi-page TIFF, the format archives and scanners use.PDF to WebP ConverterConvert PDF pages into WebP — roughly 30% smaller than JPG at the same quality.PDF to Word ConverterConvert PDFs into 100% editable Microsoft Word (.docx) documents with paragraphs, fonts, sizes and grid tables.PDF to XLSX ConverterConvert PDF tables into a Microsoft Excel XLSX workbook.PDF to XML ConverterExport PDF page layout into structured XML with per-line coordinates.PDF to ZIP ArchivePackage a PDF's text into a ZIP — one file per page, plus Markdown and HTML of the whole document.PowerPoint to Animated GIFTurn a deck into one looping animated GIF, a few seconds per slide.PowerPoint to HTML ConverterTurn a deck into a scrollable HTML page of slide cards with speaker notes.PowerPoint to ImagesRender every slide as an image at the resolution you choose.PowerPoint to JPG ConverterRender presentation slides as JPG images.PowerPoint to Markdown ConverterExtract slide titles, bullets and speaker notes as Markdown.PowerPoint to PDF ConverterConvert a presentation into a PDF of real, searchable text — one page per slide.PowerPoint to PNG ConverterRender presentation slides as lossless PNG images.PowerPoint to SVG ConverterExport slides as vector SVGs with live, selectable text.PowerPoint to Text ConverterExtract all slide text and speaker notes as plain text.PowerPoint to Video ConverterEncode a deck into an H.264 MP4 video, a few seconds per slide.PPTX to PDF ConverterConvert a .pptx deck into a PDF with selectable vector text.Protect PDF with PasswordEncrypt a PDF with a password using AES-128, and choose what readers are allowed to do.Redact PDFBlack out names, figures or images so they are genuinely gone, not just hidden behind a box.Reorder PDF PagesRearrange the pages of a PDF by dragging thumbnails, with nothing re-rendered.Repair PDFRewrite a PDF's internal structure to recover a file that will not open properly.Resize PDF PagesScale every page of a PDF to a standard paper size so it prints consistently.Rotate PDFRotate all or selected pages of a PDF by 90, 180 or 270 degrees.Scan to PDFUse your camera to capture pages and turn them into a clean, multi-page PDF.Sign PDF DocumentDraw your signature, drag it onto the page and save a signed PDF — without uploading anything.Split PDFExtract pages from a PDF or split it into separate files.Text to PDFTurn plain text, notes or log output into a paginated PDF with page numbers.Unlock PDF PasswordDecrypt a PDF you have the password for, or strip owner restrictions that need no password at all.Add Watermark to PDFStamp text across every page of a PDF — for drafts, confidential copies and proofs.Word to PDFConvert a Word .docx file to PDF entirely in your browser — headings, lists and tables intact.
Audio & Video Tools
Category page →Audio ConverterConvert audio between MP3, WAV, AAC, OGG and FLAC in your browser.Audio to SubtitlesGenerate timed SRT or WebVTT subtitles from an audio recording.Audio to Text TranscriberTranscribe speech in an audio file to text with Whisper, running on your own device.Audio TrimmerCut a section out of an audio file, with optional fade in and out.MP3 to M4A ConverterConvert MP3 audio into an M4A (AAC) file — smaller at the same quality.MP4 to MOV ConverterConvert MP4 video into a QuickTime MOV — usually without re-encoding.Remove Audio from VideoStrip the audio track from a video without re-encoding the picture.Subtitle ConverterConvert between SRT, WebVTT, ASS/SSA, MicroDVD and plain text.Subtitle MergerJoin two subtitle files end to end, or stack two languages into bilingual cues.Subtitle Quality CheckerCheck subtitles against broadcast standards for reading speed, line length and duration.Subtitle Sync & ShifterFix out-of-sync subtitles by shifting every cue, or stretching them for a frame-rate change.Subtitles to Plain TextTurn an SRT, VTT or ASS subtitle file into a clean transcript.Transcript to SubtitlesTurn a plain transcript into timed SRT or WebVTT cues at a realistic reading speed.Video CompressorShrink video file size with adjustable quality — locally, with no upload limit.Video ConverterConvert video between MP4, WebM and MKV entirely in your browser.Video Frame ExtractorPull still frames out of a video as images — for thumbnails and contact sheets.Video to MP3 ConverterExtract the audio track from a video and save it as MP3, WAV, AAC or OGG.Video to GIF ConverterTurn a video clip into an animated GIF with control over frame rate and size.Video to Frames / ImagesExtract frames from a video at any interval as JPG or PNG images.Video to SubtitlesGenerate timed SRT or WebVTT subtitles from a video, in your browser.Video to Text TranscriberPull a transcript out of a video's speech without uploading the file.Video to WebP AnimationTurn a short video clip into an animated WebP — far smaller than a GIF.Video TrimmerCut a clip out of a video by start and end time, without uploading it.
Color Tools
Category page →Colour Blindness SimulatorSee how a colour appears to people with protanopia, deuteranopia and tritanopia.Colour ConverterConvert any colour to HEX, RGB, HSL, HSV, CMYK, LAB and native code — with contrast, tints and harmonies.Colour Mixer & BlenderBlend two colours and generate the intermediate steps between them.Colour Palette GeneratorBuild harmonious palettes — complementary, triadic, analogous and monochromatic.Colour Tints & Shades GeneratorGenerate lighter tints and darker shades of any colour, with hex values.WCAG Contrast CheckerCheck colour contrast against WCAG AA and AAA thresholds for accessible text.CSS Named Colours ReferenceEvery CSS colour name with its HEX, RGB, HSL and OKLCH value, sortable by hue and contrast.Random Colour GeneratorGenerate random colours as a free palette or a harmony built around a base colour.Tailwind Colour Shade GeneratorGenerate a full 50–950 Tailwind colour scale from a single brand colour.
CSS Generators
Category page →Blob Shape GeneratorDesign organic SVG backgrounds: four interpolation styles, gradients, layers and any canvas size.CSS Border Radius GeneratorDrag eight handles to shape every corner: elliptical radii, inverted corners and squircles.CSS Box Shadow GeneratorDesign a CSS box-shadow with live values for offset, blur, spread and colour.CSS Animation GeneratorGenerate keyframe animations — fade, slide, bounce, pulse, spin and shake.CSS Button GeneratorDesign a button and copy the CSS, including the hover, active and focus-visible states.CSS Clamp GeneratorGenerate fluid clamp() values that scale smoothly between two viewport widths.CSS Clip Path GeneratorCut an element to a polygon, circle, ellipse or inset, and copy the clip-path.CSS Multi-Column GeneratorFlow text into balanced columns with a rule between them.CSS Cursor Reference & GeneratorHover to try every CSS cursor keyword, and copy the one you want.CSS Filter GeneratorBuild a CSS filter chain visually and see it applied to a real element as you adjust it.CSS Grid GeneratorBuild a CSS Grid layout visually and copy the container CSS.CSS Hover Effect GeneratorGenerate a hover effect that animates cleanly, with the reduced-motion guard included.CSS Loader GeneratorBuild a spinner, dots, bars or a pulse from pure CSS and copy the keyframes.CSS Pattern & Texture GeneratorGenerate repeating background patterns in pure CSS — no image files to host.CSS Scrollbar StylerStyle a scrollbar with both the standard properties and the WebKit pseudo-elements.CSS Shape GeneratorGenerate triangles, arrows, stars and other shapes using pure CSS.CSS Specificity CalculatorWork out a selector's specificity and see which parts contributed what.CSS Tooltip GeneratorGenerate a tooltip from a data attribute — no JavaScript, no extra markup.CSS Transform GeneratorBuild a 2D or 3D transform visually and copy the CSS, with the transform origin handled properly.Cubic Bezier Easing GeneratorBuild custom CSS easing curves and see the motion they produce.CSS Flexbox GeneratorExperiment with flex direction, alignment and wrapping, then copy the CSS.Glassmorphism CSS GeneratorCreate frosted-glass CSS with backdrop blur, transparency and a subtle border.CSS Gradient GeneratorBuild linear, radial and conic CSS gradients and copy the code.Gradient Text GeneratorFill text with a gradient, a metallic sheen or a chrome effect using background-clip.CSS Media Query GeneratorGenerate responsive breakpoint media queries, with common device presets.Neumorphism GeneratorGenerate the paired light and dark shadows that make an element look pressed into or raised from its background.nth-child Selector GeneratorBuild an :nth-child formula and see which items it selects out of a row.PX to REM ConverterConvert between pixels, rem and em using your project root font size.CSS Text Shadow GeneratorDesign text shadows, outlines and glow effects with a live preview.Type Scale GeneratorBuild a modular typographic scale and copy it as CSS custom properties.Z-Index & Stacking Context CheckerPaste your CSS and find the property that trapped the element in a stacking context.
Developer Tools
Category page →7Z to ZIP ConverterConvert 7-Zip (.7z) archives into universal ZIP format.API Request BuilderBuild an HTTP request visually and get it as curl, fetch, axios, Python, Go or PHP code.Naming Convention ConverterConvert an identifier between every common naming convention at once.Code Comment RemoverStrip comments from six language families without breaking string literals.Cron Expression ParserTranslate a cron expression into plain English and see when it will next run.Cron Next Run CalculatorSee the next fire times for a cron expression, with each field explained.Content Security Policy GeneratorBuild a CSP header from common presets, with each directive explained.Text Diff CheckerCompare two texts and highlight exactly what was added and removed.Unified Diff & Patch GeneratorProduce a unified diff between two texts that git apply and patch can consume..env File ValidatorCheck a .env file for syntax errors, duplicate keys, exposed secrets and missing entries.Font to Base64 & CSS GeneratorConvert font files directly into CSS @font-face data URIs.Git Command BuilderBuild the exact git command for fifteen common tasks, with explanations and safety notes..gitignore GeneratorBuild a .gitignore file for your stack, with the entries people usually forget.GraphQL FormatterFormat or minify a GraphQL query, mutation or schema, and inspect its depth.GZIP to ZIP ConverterConvert GZ files into standard ZIP archives.HTTP Security Header AnalyserPaste response headers and get a security grade, with what is missing and why it matters.HTTP Status Code ReferenceLook up what any HTTP status code means and when to use it.JSON Schema GeneratorInfer a JSON Schema from example data, detecting types, string formats and required keys.Line Endings ConverterConvert between CRLF, LF and CR, and strip trailing whitespace.Log File ParserParse Apache, Nginx or JSON log lines into a sortable table with traffic summaries.MIME Type LookupFind the correct MIME type for any file extension, and vice versa.OTF to TTF ConverterConvert OpenType (.otf) fonts to TrueType (.ttf) format.RAR to ZIP ConverterExtract RAR archives and repackage contents into standard ZIP format.Redirect Rule GeneratorGenerate redirect rules for Apache, Nginx, Netlify, Vercel and Next.js.Regex ExplainerBreak a regular expression into tokens and explain each one in plain English.Regex TesterTest regular expressions against sample text and see every match with its capture groups.Semantic Version CheckerTest versions against a range, sort by precedence, or compare two releases.SQL IN Clause BuilderTurn a pasted column of values into a safely quoted SQL IN clause, batched if needed.Tabs to Spaces ConverterConvert indentation between tabs and spaces without disturbing alignment inside lines.TAR to ZIP ConverterConvert uncompressed TAR archives into compressed ZIP files.TTF to WOFF ConverterConvert TrueType (.ttf) fonts to Web Open Font Format (.woff).TTF to WOFF2 ConverterConvert TrueType (.ttf) fonts to optimized WOFF2 web fonts.URL BuilderCompose a URL from its parts with correctly percent-encoded query parameters.URL ParserBreak a URL into protocol, host, path, query parameters and fragment.User Agent ParserBreak down a user-agent string into browser, engine, operating system and device.UUID InspectorIdentify a UUID version and variant, and extract the timestamp from v1, v6 and v7.Format ValidatorValidate emails, UUIDs, IP addresses, credit card numbers, IBANs and semver strings.WOFF to TTF ConverterConvert WOFF web fonts back to desktop TrueType (.ttf) fonts.WOFF2 to TTF ConverterDecompress WOFF2 fonts back to TTF format.ZIP to 7Z ConverterRepackage ZIP files into high-compression 7Z format.ZIP to TAR ConverterConvert ZIP archive files to TAR format.
SEO Tools
Category page →AI Crawler robots.txt GeneratorGenerate the robots.txt rules for 21 AI crawlers, separating training from search and from fetches a real user asked for.Keyword Density CheckerAnalyse which words and phrases dominate your content, and how often they appear.llms.txt GeneratorBuild a valid llms.txt: a curated, Markdown map of your site written for a model with a limited context window.Meta Tag GeneratorGenerate title, description, Open Graph and Twitter Card tags for any page.robots.txt GeneratorBuild a valid robots.txt file with sitemap references and crawler rules.Schema Markup GeneratorGenerate JSON-LD structured data for organisations, articles, FAQs, products and more.Google SERP PreviewPreview how your page title and description will appear in Google search results.XML Sitemap GeneratorTurn a list of URLs into a valid XML sitemap ready to submit to search engines.X (Twitter) Card ValidatorPaste your meta tags to check the X card type, title, description and image against the documented rules, including Open Graph fallbacks.UTM Link BuilderBuild tagged campaign URLs that track correctly in Google Analytics.
Network Tools
Category page →DNS LookupPull every DNS record for a domain at once, check SPF and DMARC, and compare four public resolvers.Email Header AnalyzerPaste raw email headers to map the delivery path, time every hop and read the SPF, DKIM and DMARC results the receiving server recorded.HTTP Header CheckerFollow every redirect, grade the security headers and read the cookie and caching settings.Open Graph PreviewRender your share card the way each platform really draws it, with the og:image measured.SSL Certificate CheckerOpen a real TLS handshake to any host and read the certificate it is serving right now.What Is My IP AddressYour public IPv4 and IPv6 address with the routing, registry, blocklist and VPN-leak detail behind it.WHOIS / RDAP Domain LookupRegistration dates, transfer locks and status codes in plain English, cross-checked against live DNS.
QR & Barcodes
Category page →Barcode GeneratorGenerate scannable retail and logistics barcodes, with the check digit and print size checked as you type.Barcode ReaderRead a code from a photo, a screenshot or your camera, entirely in your browser.Business Card QR to vCardDecode the QR code on a business card and save the contact as a .vcf file for any address book.QR Code GeneratorDesign QR codes with custom shapes, gradients and a logo, and check they will still scan.QR Code ReaderDecode a QR code from an image or your camera, and check the link before you open it.QR Code to TextPull the raw text, link or data out of a QR code image, and check it before you act on it.vCard GeneratorBuild a contact card with several numbers and addresses, and get the .vcf plus a scannable QR.
Calculators
Category page →Bill SplitterSplit a bill evenly or by what each person ordered, with tip and tax handled correctly.Break-Even Point CalculatorFind how many units you must sell to cover your costs.CAGR CalculatorCompound annual growth rate between two values, with the year-by-year path.Calorie CalculatorTurn a daily calorie target into a weekly deficit, a projected rate of change and a per-meal split.Compound Interest CalculatorProject savings growth with compound interest and regular contributions.Currency ConverterConvert between 30+ currencies using official European Central Bank reference rates.Debt Payoff CalculatorCompare snowball and avalanche repayment strategies across several debts.Weighted Decision MatrixScore options against weighted criteria and see which choice actually wins.Depreciation CalculatorStraight-line, declining balance, double-declining and sum-of-years depreciation schedules.Dice RollerRoll any number of dice with any number of sides, plus a modifier.Discount CalculatorWork out sale prices, stacked discounts and how much you actually save.Emergency Fund CalculatorSize an emergency fund from your real monthly outgoings and see how long it takes to build.Exponent, Root & Logarithm CalculatorCalculate powers, nth roots, logarithms in any base, and exponentials.FD CalculatorWork out what a fixed deposit matures to, with quarterly compounding and TDS accounted for.Fraction CalculatorAdd, subtract, multiply and divide fractions, with the result simplified.Freelance Rate CalculatorWork out the hourly and day rate you need to hit a target income after time off, costs and tax.GCD & LCM CalculatorFind the greatest common divisor and lowest common multiple of any set of numbers.GST CalculatorAdd GST to a price or work backwards from a GST-inclusive total, with the CGST/SGST split.Inflation CalculatorSee what an amount of money is worth after inflation over any period.Invoice GeneratorCreate invoices, quotes and GST tax invoices, keep clients and history in your browser, and download a clean PDF — no sign-up.Loan & EMI CalculatorCalculate monthly repayments, total interest and the full cost of a loan.Markup & Margin CalculatorConvert between markup and margin — they are not the same number, and confusing them costs money.Meeting Cost CalculatorWork out what a meeting actually costs in salary time, per session and per year.Mortgage Comparison CalculatorCompare two loan offers side by side — payment, total interest and the true cost with fees.NPV & IRR CalculatorNet present value, internal rate of return and payback period for a series of cash flows.Percentage CalculatorWork out percentages, percentage change and reverse percentages with the working shown.Permutation & Combination CalculatorCalculate nPr, nCr and factorials for counting and probability problems.Pregnancy Due Date CalculatorEstimate a due date from a last period, conception date or an early scan, with milestones.Prime Number Checker & FactoriserCheck whether a number is prime and see its full prime factorisation.Profit Margin & Markup CalculatorCalculate margin, markup and profit from cost and selling price — they are not the same thing.Quadratic Equation SolverSolve ax² + bx + c = 0 with real or complex roots and see the discriminant.Random Number GeneratorGenerate random numbers in any range, with optional uniqueness — for draws and sampling.Ratio CalculatorSimplify ratios, scale them, and solve for a missing value in a proportion.RD CalculatorWork out what a monthly recurring deposit matures to, with quarterly compounding.Rent vs Buy CalculatorCompare the total cost of renting against buying over a period you choose.Retirement Withdrawal CalculatorModel a safe withdrawal rate and see how long a pot lasts against inflation and returns.ROI CalculatorCalculate return on investment and the annualised rate.Salary ConverterConvert between hourly, daily, weekly, monthly and annual pay.Savings Goal CalculatorWork out how long it takes to reach a savings target, and what to save monthly.Simple Interest CalculatorCalculate simple interest and see how it differs from compound interest.SIP CalculatorProject a monthly investment plan, with optional annual step-up and the invested-versus-gain split.Mean, Median & Mode CalculatorCalculate mean, median, mode, range, variance and standard deviation from a list of numbers.Tip Calculator & Bill SplitterWork out the tip and split a bill evenly between any number of people.Trigonometry CalculatorCalculate sine, cosine, tangent and their inverses in degrees or radians.Unit Price ComparatorWork out which pack size is actually cheaper per unit, weight or volume.VAT & Sales Tax CalculatorAdd or remove VAT, GST or sales tax at any rate, with the net and tax split out.Weighted Average CalculatorCalculate a weighted mean — for grades, ratings and portfolio returns.Z-Score CalculatorCalculate how many standard deviations a value sits from the mean, with percentile.
Date & Time Tools
Category page →Age CalculatorWork out exact age in years, months and days — plus total days and the next birthday.Meeting Agenda TimerTurn an agenda into a timed schedule with start and end times for every item.Countdown CalculatorCount down to any date and see the gap in years, months, weeks, days, hours and minutes.Add or Subtract Days from a DateFind the date a set number of days, weeks, months or years before or after another.Date Difference CalculatorCount the days, weeks, months and working days between two dates.Date Format ConverterReformat a list of dates into ISO, US, European, RFC or any custom pattern.Day of Year CalculatorFind the ordinal day number, week number, quarter and how much of the year has elapsed.Time Duration CalculatorAdd, subtract and average durations written as 1h 30m, 90:00 or 1:30:00.Leap Year CheckerCheck whether a year is a leap year and see the next and previous ones, with the rule explained.Moon Phase CalculatorFind the moon phase, illumination and age for any date, plus the upcoming new and full moons.Sunrise & Sunset CalculatorCalculate sunrise, sunset, twilight and day length for any latitude and longitude.Timesheet CalculatorTotal daily clock-in and clock-out times, with breaks, rounding and optional pay.Unix Timestamp ConverterConvert Unix timestamps to human dates and back, in seconds or milliseconds.Time Zone ConverterConvert a time between any two time zones, with daylight saving handled correctly.Timezone Meeting PlannerFind the hours that are inside working time for everyone, across up to a dozen timezones.ISO Week Number CalculatorFind the ISO 8601 week number, quarter and day of year for any date.Working Days CalculatorCount business days between two dates, excluding weekends and your own holiday list.
Health & Fitness
Category page →BMI CalculatorCalculate body mass index in metric or imperial units, with the WHO categories.BMR & Calorie CalculatorEstimate your basal metabolic rate and daily calorie needs using Mifflin-St Jeor.Body Fat Percentage CalculatorEstimate body fat percentage using the US Navy tape-measure method.Heart Rate Zone CalculatorCalculate your training zones from maximum and resting heart rate.Macro CalculatorSplit daily calories into protein, carbohydrate and fat targets in grams.Running Pace CalculatorCalculate your pace per kilometre or mile and project finish times for common races.Sleep Cycle CalculatorFind the best times to sleep or wake based on 90-minute sleep cycles.Daily Water Intake CalculatorEstimate how much water to drink each day based on weight, activity and climate.
Accessibility
Category page →Alt Text CheckerFind images with missing, empty, filename-based or overlong alternative text.ARIA Roles ReferenceSearch ARIA roles with their required attributes, native HTML equivalents and gotchas.Heading Structure ValidatorCheck a page for skipped heading levels, missing or multiple H1s and empty headings.HTML Landmark CheckerCheck a page for the landmark regions screen reader users navigate by.Link Text CheckerFind vague link wording — "click here", "read more", bare URLs and duplicated labels.Palette Accessibility GraderGrade every colour in a palette against one or more backgrounds for WCAG contrast.Touch Target Size CheckerCheck whether a button or link meets the minimum tap target size and spacing.
Samples & Mock Data
Category page →Edge Case Test String GeneratorGenerate the strings that break input handling — Unicode, RTL, emoji, injection patterns and boundary lengths.Fake Address GeneratorGenerate valid-format test addresses for six countries, with correct postcode and phone patterns.Lorem Ipsum GeneratorGenerate placeholder text in paragraphs, sentences, words or list items.Mock Data GeneratorGenerate realistic fake test data in 14 formats from 100+ field types, with reproducible seeds.Placeholder Avatar GeneratorGenerate unique SVG avatars — initials, identicons, gradients or geometric shapes.Placeholder Image GeneratorGenerate placeholder images at any size with custom colours and label text.Sample API Response GeneratorGenerate realistic REST, JSON:API, GraphQL and error-envelope responses with pagination.Sample Audio File GeneratorGenerate WAV test audio: sine, square, sweep, noise or silence at any rate, depth and duration.Sample Dataset GeneratorDownload ready-made sample datasets — users, orders, products, transactions — as CSV, JSON, SQL or Excel-ready TSV.Sample File GeneratorCreate valid test files of an exact size in 22 formats — text, data, code, images, audio, PDF and ZIP.Sample File LibraryDownload a ready-made ladder of 15 sample files: size steps, page counts, aspect ratios, durations or row counts.Sample Image GeneratorGenerate test images at any aspect ratio, resolution, pattern, quality or exact file size.Sample JSON GeneratorTurn a JSON Schema into realistic sample documents, respecting types, enums, formats and constraints.Sample Log File GeneratorGenerate realistic Apache, Nginx, JSON, syslog or application logs with a controllable error rate.Sample Markdown GeneratorGenerate Markdown documents exercising every feature — tables, code, footnotes, task lists and more.Sample PDF GeneratorBuild test PDFs with any page count, paper size, orientation, content type and file size.Random Person GeneratorGenerate complete fake personas — name, email, address, phone, job, company, bio and avatar.Sample SQL Data GeneratorGenerate CREATE TABLE and INSERT statements with realistic seed data for four SQL dialects.Test Credit Card Number GeneratorGenerate Luhn-valid test card numbers for seven brands. Structurally correct, deliberately non-functional.
Design Studio
Category page →App Icon GeneratorTurn one square image into every app icon size iOS, Android, the web and desktop need.App Store Screenshot GeneratorTurn raw app screenshots into captioned App Store artwork at every resolution Apple requires.Device Mockup GeneratorDrop a screenshot into a real device frame, angle it, light it and export it at any size.Play Store Feature Graphic GeneratorBuild the 1024 × 500 banner Google Play requires, plus store header and TV banner sizes.Open Graph & Social Card GeneratorDesign the 1200 × 630 image that appears when your link is shared, plus every other social size.Play Store Screenshot GeneratorCreate Google Play listing screenshots with captions and device frames at every accepted size.Screenshot BeautifierWrap a plain screenshot in a gradient, rounded corners, a shadow and browser chrome.Signature GeneratorDraw your signature and download it as a transparent PNG for documents.
Browser & Device
Category page →Voice RecorderRecord voice notes or audio from your microphone and download the file. No account, no upload.What Browser Am I Using?See your browser, engine, version, platform and which web features it supports.Camera TestCheck that your webcam works, see the resolution it delivers and take a test photo.Connection & Network InformationSee what your browser reports about the network: connection type, downlink estimate and round-trip time.File Type IdentifierIdentify any file from its magic bytes, and see whether the extension is telling the truth.Installed Font CheckerTest which system fonts are actually available before you rely on them in a font stack.Media File InfoRead the duration, dimensions, frame rate and playability of an audio or video file.Microphone TestCheck that your microphone works, watch the live waveform and see whether your level is right.Browser Permissions InspectorCheck the permission state of camera, microphone, location, notifications and more for this origin.Screen RecorderRecord your screen, a window or a browser tab with optional audio, straight from this page.What Is My Screen Resolution?Check your screen resolution, browser viewport, device pixel ratio, colour depth and GPU.ZIP File CreatorBundle any number of files into a ZIP archive entirely in your browser.ZIP File ExtractorLook inside a ZIP, EPUB, DOCX or JAR and extract the files you want, in your browser.
Randomisers & Games
Category page →Bingo Card GeneratorGenerate unique bingo cards from your own list of items, with an optional free space.Dice Probability CalculatorRoll dice notation like 3d6+2 and see the full probability distribution.Lottery Number GeneratorGenerate random lottery lines for common draws, with the real odds shown.Random Date GeneratorGenerate random dates in a range, optionally restricted to working days.Random Picker & Team GeneratorPick winners from a list, or split names into balanced random teams.Random Team GeneratorSplit a list of people into balanced random teams, by team count or team size.Secret Santa GeneratorDraw gift assignments where nobody gets themselves, with exclusions for couples.Tournament Bracket GeneratorBuild a single-elimination bracket with byes placed correctly for any number of entrants.Username GeneratorGenerate available-looking usernames and handles in several styles.
AI & LLM Tools
Category page →AI API Cost CalculatorWork out what a prompt costs per call, per day and per month, and compare the same workload across every major model.AI Writing Pattern CheckerMeasure sentence-length variance, vocabulary richness, marker phrases and typographic tells, with per-sentence scoring.Chat Export FormatterDrop in an exported conversations file and get clean Markdown, HTML or plain text — one document per conversation.Context Window CalculatorPaste a document and see which models it fits inside, how much of each window it fills, and what is left for the reply.Embedding Similarity CalculatorPaste embedding vectors and get every pairwise cosine, dot product, Euclidean and Manhattan distance, ranked.Fine-Tuning Dataset ConverterConvert training data between the six common chat formats, and validate the result against the rules the upload endpoints enforce.GGUF Quantisation Size CalculatorWork out the download size of a quantised model at every GGUF level, and what quality each one costs you.Invisible Character DetectorFind zero-width spaces, directional overrides, Unicode tag characters and homoglyphs hidden in pasted text — then strip them.JSONL ValidatorValidate JSON Lines line by line, check chat-format structure, and estimate what training on the file would cost.LLM Model ComparisonEvery current model side by side: price per million tokens, context window, max output, modalities and cache rates.LLM Stream ParserPaste a raw server-sent-event stream and get the reconstructed message, tool calls, usage and stop reason.LLM Token CounterCount tokens with the real BPE vocabulary, see every token coloured in place, and compare the count across models.LLM VRAM CalculatorWork out exactly how much video memory a local model needs, including the KV cache that scales with context length.Prompt Injection SanitizerStrip invisible carriers, neutralise instruction-like markup and fence untrusted content before you paste it into a prompt.Prompt Template GeneratorWrite a prompt once with placeholders, paste rows of data, and get every filled prompt back with its token count and cost.Prompt Token OptimizerStrip the padding out of a prompt — dead whitespace, boilerplate politeness, redundant framing — and see the tokens and money saved.Temperature & Top-p VisualizerWatch sampling parameters change which tokens can actually be chosen, on a real softmax over logits you supply.Text Chunker for RAGChunk by tokens, sentences, paragraphs, a separator ladder or markdown headings — with overlap, token counts and embedding cost.LLM Tool Schema ConverterMove a function definition between OpenAI, Anthropic, Gemini, MCP and bare JSON Schema — or emit it as a TypeScript type or Zod schema.Words to Tokens ConverterConvert between words, characters, pages and tokens using measured ratios for prose, code, JSON and CJK.
On-Device AI
Category page →AI Alt Text GeneratorDescribe an image with a captioning model running in your browser — a first draft for the alt attribute you then edit.AI Audio TranscriptionRun Whisper locally to turn speech into text, SRT, VTT or a timestamped transcript. Works offline after the first run.AI Background RemoverCut the subject out of a photo with a real segmentation model that runs in your browser. No upload, no sign-up, no watermark.AI Content DetectorScore text with a real language model in your browser and see the per-token surprise that detection methods are built on.AI Photo RedactorDetect people, faces, plates and screens with an object-detection model in your browser, then blur or black them out.AI Text SummarizerCondense an article into a few sentences with a summarisation model running locally — nothing uploaded, no limit.AI Text to SpeechTurn text into natural speech with a neural voice running in your browser, and download the audio as a WAV file.Chat with Any DocumentAsk questions about a PDF, Word file, spreadsheet, CSV, Markdown or text file and get answers with the passage each came from.Chat with Excel & CSVAsk questions about a spreadsheet in plain English and get answers with the sheet and row they came from. Runs entirely in your browser.Chat with PDFAsk questions about any PDF and get answers with the page each one came from. The model runs in your browser — the file is never uploaded.Chat with Word DocumentAsk questions about a Word document and get answers with the heading each came from. Runs on your device — nothing is uploaded.Room Design VisualizerClick any wall, floor or piece of furniture in your own photo, then repaint it, remove it, or swap in a different product — all in your browser.Semantic Search & SimilarityEmbed a list of sentences with a real model and rank them by meaning — or find the near-duplicates in a list.Zero-Shot Text ClassifierGive a model any set of categories and it sorts your text into them — no training data, no fine-tuning, no API key.
What this catalogue is
Convertto is 624 separate tools in 26 categories. Each one does a single job: turn a file into another format, transform a block of text, generate a value, check something, or work out a number. There is no editor to learn, no project to create, no account, and no upload step. You open the tool that matches the job, paste or drop the input, and take the result.
If you arrived looking for "a conversion tool", the useful question is which end of the conversion you already know. When you know both formats, go straight to the pair. When you know only what you are holding, start from the category it belongs to. When you know neither, the search box reads every tool name, keyword and synonym on the site.
Everything runs in your browser
Files are read, processed and written back inside the page. Nothing is uploaded, so there is no queue, no file size ceiling beyond your own memory, and no copy of your document sitting on a server afterwards. That is the reason a contract, a medical scan or an unreleased app screenshot can go through these tools at all. Heavier work runs in a Web Worker or in WebAssembly, such as FFmpeg for video and a speech model for transcription, which is why a few tools download something once and then keep working offline.
How the categories are grouped
The categories are organised around what you have in front of you rather than around the technology underneath, because that is what people can name when they start looking.
- A file to convert. pdf tools, image tools, audio & video tools and qr & barcodes cover documents, pictures, audio and video, and the codes that carry data between them.
- Text or structured data. text tools for case, counting, sorting and cleaning; data & format tools for JSON, YAML, CSV, XML and the type definitions generated from them; encoders & decoders for Base64, URL escaping, entities and JWTs; hash & crypto tools for hashes, HMACs and password generation.
- A number or a date. unit converters for measurements, number tools for bases and notation, calculators for percentages, loans, interest and tax, date & time tools for timestamps, timezones and durations, and health & fitness for the fitness formulas.
- Something you are building. css generators and color tools for styling, developer tools for regex, cron, diffs and validators, seo tools for metadata and structured data, accessibility for WCAG checks, and browser & device for testing the device itself.
- Something you are designing or shipping. design studio for store screenshots, icons, mockups and social cards, social media tools for post limits, hashtags and thumbnails, and samples & mock data for test files and mock data at any size or shape.
- Work with a model. ai & llm tools for tokens, cost, context windows, chunking and dataset formats, and on-device ai for the models that run on your own device.
- Everything else. network tools for lookups, randomisers & games for draws, teams and dice.
When you know both formats
There are 804 direct converter pages named for the pair itself, such as PNG to JPG. They open the right tool with both formats already set, which saves picking them out of a dropdown. The tool behind a pair is the same tool you would reach from its category, so nothing is lost by going the long way around.
If none of the categories above sounds like what you need, use search. It matches the words people actually type, including the ones that are not the official name of the format.
Social Media Tools
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