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Test file generator

dummyfiles.dev lets you create test files in any size – via the web form, no signup. Suited for upload tests, load tests, and development.

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What are test files?

Test files (dummy files) have a defined size and format but no real content. Developers and QA use them to check upload limits, check upload limits, or validate import logic – without real user data.

dummyfiles.dev provides exactly that: configurable size (1 KB to 5 GB), file type (ZIP, BIN, JPG, PNG, WebP, PDF), and fill mode (random or zero bytes). Use the web form or a simple Use via the website.

Features

Size: 1 KB to 5 GB, in KB, MB, or GB.

Types: ZIP, BIN, JPG, PNG, WebP, PDF. Content is generated according to type and mode (e.g. random bytes for realistic load).

Modes: Random (random bytes, barely compressible) or zero (null bytes, highly compressible – e.g. for ZIP tests).

Note: Downloads work only through the homepage (protected form request), not via direct URLs.

Typical use cases

  • Verify upload limits (e.g. “max 10 MB”)
  • Load testing for servers or CDNs
  • Test compression behaviour (ZIP)
  • Pipeline or upload testing with fixed file sizes
  • QA automation: generate the same test files repeatedly

Highlights

  • Files up to 5 GB
  • No registration required
  • Use via the website, easy to use in scripts or CI
  • Optional custom filename for download

FAQ

What is a test file?
A file with a defined size and optionally format, but no meaningful content – for testing uploads, performance, or parsers.
How do I create a dummy file?
On the homepage choose “File by size”, set size and type, click “Create file”.
How large can files be?
Up to 5 GB. Specify in KB, MB, or GB (e.g. 100MB, 2GB).
Can I generate test data for uploads and integration tests?
For binary files and file size, yes – via the File tab on the homepage. For structured data (JSON, CSV), dummyfiles.dev has separate generators.
What’s the difference between random and zero?
Random: random bytes, hardly compressible. Zero: null bytes only, ZIP becomes very small. Both useful for different test scenarios.
Do I need an account?
No. The form works without signup.

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