Random File Generator
Generate files filled with random data. Choose the file extension, size, and unit. Perfect for testing file uploads, storage limits, and application behavior.
Generated File Info
Click "Generate File" to create a random file.
Why use this tool?
Testing applications often requires files of specific sizes and formats. This tool generates random files instantly in your browser without uploading anything to a server.
- Multiple formats — Choose from TXT, BIN, CSV, JSON, XML, and more.
- Customizable size — Generate files from 1 KB to 100 GB (browser limits apply).
- Privacy-focused — All generation happens in your browser. No data is stored or transmitted.
- Fast and free — No sign-up, no limits, no ads.
How to use
- Select the desired file extension from the dropdown.
- Enter the file size and choose the unit (KB, MB, or GB).
- Click Generate File to create the random file.
- The file will download automatically to your device.
Frequently Asked Questions
Yes, completely free with no sign-up required.
The maximum size depends on your browser's memory. Generally, files up to a few hundred MB work well. Larger files may cause browser slowdowns.
Yes, the tool uses cryptographically secure random number generation when available, falling back to Math.random() for older browsers.