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Convertto

Sample Files & Mock Data Generators

Generate test files, fake data and placeholder content in any format, size, quantity or shape.

Convertto generates sample files and mock data for testing: dummy files at any size from 1 KB to 64 MB in 22 formats, realistic fake records from over 100 field types, multi-page PDFs, test images at any aspect ratio, WAV audio, log files, API responses and Luhn-valid test card numbers. Everything is generated in your browser and seeded, so results are reproducible.

19 tools in this category

All samples & mock data

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.

Frequently asked questions

Is generated sample data safe to use?

Yes, for testing. Names, addresses, card numbers and bank details are synthetic — structurally valid but corresponding to no real person or account, which is exactly why they are safer than copying production data into a development environment.

Why does every generator have a seed?

A seed makes the output reproducible. The same seed and settings always produce identical data, and because the seed travels in the page URL, a shared link recreates the exact dataset a colleague was looking at.

Can I generate a file of a specific size?

Yes. The sample file generator targets an exact byte count in 22 formats, and the sample file library offers a ready-made ladder of 15 sizes from 1 KB to 50 MB in a single download.

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