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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