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624+ free tools that run in your browser.
Converters, generators and calculators with no sign-up, no upload and no limits. Your files are processed on your device and never sent to a server.
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AI tools that run on your device
34 tools, no API key and no account. Token counts come from the real vocabularies the models use, and the ones that need a model download it once and run it in your browser — so prompts, documents and recordings never leave your machine.
AI & LLM Tools20Count tokens, estimate API cost, chunk documents for RAG, convert fine-tuning datasets and size a local model.OpenOn-Device AI14Remove backgrounds, transcribe audio, generate speech, upscale images and embed text — with the model running on your own device.Open
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 & LLM ToolsAI Audio TranscriptionRun Whisper locally to turn speech into text, SRT, VTT or a timestamped transcript. Works offline after the first run.On-Device AIAI 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.On-Device AIAI Content DetectorScore text with a real language model in your browser and see the per-token surprise that detection methods are built on.On-Device AIAI Text to SpeechTurn text into natural speech with a neural voice running in your browser, and download the audio as a WAV file.On-Device AIAI Writing Pattern CheckerMeasure sentence-length variance, vocabulary richness, marker phrases and typographic tells, with per-sentence scoring.AI & LLM Tools
Browse by category
624 tools across 26 categories, plus 804 direct converters.
Unit Converters22Convert length, weight, temperature, volume, speed, data and 20+ other measurement types.Number Tools11Binary, hex, octal, roman numerals, number-to-words and scientific notation.Text Tools78Change case, count words, sort lines, remove duplicates, diff, encode and transform text.Data & Format Tools57Convert, format and validate JSON, YAML, XML, CSV, TOML and Markdown.Encoders & Decoders21Base64, URL, HTML entities, JWT, hex, binary, Unicode and more.Hash & Crypto Tools25MD5, SHA-1/256/512, HMAC, bcrypt, AES, TOTP, UUID and password generators.Image Tools39Convert, resize, crop, compress and edit images without uploading them.PDF Tools76Merge, split, rotate, compress and convert PDFs — privately in your browser.Audio & Video Tools23Convert, trim and compress video and audio with in-browser FFmpeg.Color Tools9Convert between color formats, build palettes and shade scales, and check WCAG contrast.CSS Generators31Generate gradients, shadows, animations, grid, flexbox, clip-path, loaders and more.Developer Tools41Regex tester, cron builder, diff checker, timestamps, validators and generators.SEO Tools10Meta tags, Open Graph previews, schema markup, robots.txt and sitemaps.Network Tools7IP info, DNS records, HTTP headers, SSL certificates and WHOIS.QR & Barcodes7Generate and read QR codes, barcodes and vCards.Calculators48Percentage, statistics, loans, interest, tax, discounts and currency.Date & Time Tools17Timestamps, timezones, age, durations, business days and countdowns.Health & Fitness8BMI, BMR, calories, body fat, macros, pace and water intake.Accessibility7Check heading structure, alt text, link wording, colour contrast and touch target sizes.Samples & Mock Data19Generate test files, fake data and placeholder content in any format, size, quantity or shape.Design Studio8Build App Store and Play Store screenshots, device mockups, icons, banners and social cards.Browser & Device13Test your camera, microphone and screen, inspect your browser, and work with local storage and ZIPs.Randomisers & Games9Pick a winner, split teams, draw Secret Santa, roll dice and build brackets.Social Media Tools4Hashtags, character counters, emoji, thumbnails and post previews.AI & LLM Tools20Count tokens, estimate API cost, chunk documents for RAG, convert fine-tuning datasets and size a local model.On-Device AI14Remove backgrounds, transcribe audio, generate speech, upscale images and embed text — with the model running on your own device.
Popular tools
See all →Age CalculatorWork out exact age in years, months and days — plus total days and the next birthday.Date & Time ToolsAI Crawler robots.txt GeneratorGenerate the robots.txt rules for 21 AI crawlers, separating training from search and from fetches a real user asked for.SEO ToolsAlt Text CheckerFind images with missing, empty, filename-based or overlong alternative text.AccessibilityAPI Request BuilderBuild an HTTP request visually and get it as curl, fetch, axios, Python, Go or PHP code.Developer ToolsApp Icon GeneratorTurn one square image into every app icon size iOS, Android, the web and desktop need.Design StudioApp Store Screenshot GeneratorTurn raw app screenshots into captioned App Store artwork at every resolution Apple requires.Design StudioBarcode GeneratorGenerate scannable retail and logistics barcodes, with the check digit and print size checked as you type.QR & BarcodesBase64 Encoder & DecoderEncode and decode Base64 with automatic direction detection, plus file and data-URI support.Encoders & DecodersBase64 to File ConverterDecode Base64, a data URI or hex back into a downloadable file, with the type detected automatically.Encoders & DecodersBlob Shape GeneratorDesign organic SVG backgrounds: four interpolation styles, gradients, layers and any canvas size.CSS GeneratorsBMI CalculatorCalculate body mass index in metric or imperial units, with the WHO categories.Health & FitnessCSS Border Radius GeneratorDrag eight handles to shape every corner: elliptical radii, inverted corners and squircles.CSS Generators