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Dummy File Generator

Make test files of an exact size: random or zero bytes, text, CSV, JSON, and valid PDF, PNG, WAV and ZIP files.

Free, no uploads, no sign-up. Runs 100% in your browser.

How Dummy File Generator works

Files are built byte by byte in your browser. Typed files are real and open in normal apps: the PNG gets a padding chunk with a correct checksum, the ZIP holds a text file of the right length, and the WAV plays a tone. Random data comes from the secure random generator.

Output: BIN, TXT, CSV, JSON, PDF, PNG, BMP, WAV, ZIP, SVG, HTML.

How to use Dummy File Generator

1. Open Dummy File Generator and paste or type your input.
2. Results update instantly as you type.
3. Tweak options such as format, indentation or algorithm.
4. Copy the output or download it as a file.

Tips

• Use 1 MB, 10 MB and 100 MB files to test upload limits.
• Use random bytes when you need data that will not compress.

Dummy File Generator FAQ

Are my files uploaded?

No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.

Is it free? Are there limits or watermarks?

Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.

Does it work offline?

Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

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