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TestFiles.dev

TestFiles.dev

Generate precise test files, byte by byte

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Generate exact-size test files directly in your browser, inspect magic bytes and MIME signatures, or download verified MP4, MOV, WebM, PDF and Office samples from stable URLs. Built for upload limits, file validation, media pipelines, and Playwright/Cypress fixtures—no account or upload required.

TestFiles.dev makers

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alex alactMaker of tiny tools that save you time.
TestFiles.devTestFiles.dev