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, stress APIs, 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 GET API.

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).

API: GET request with path for size (e.g. /api/file/100MB) and optional query params for type, mode, and filename.

Typical use cases

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

Highlights

• Files up to 5 GB
• No registration, no API keys
• GET API, 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”. Or call the API, e.g. /api/file/50MB?type=zip.

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 APIs?

For binary files and file size, yes – via the file API. 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 and API work without signup.

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