Runs fully in your browser. Inputs stay on your device. See recent fixes on changelog.
Dummy File Generator
Generate dummy files of a specific size for testing.
FreeRuns in browserdummy file generatortest file generator
Cmd/Ctrl+Enter Primary actionCmd/Ctrl+Shift+L Load sampleCmd/Ctrl+Shift+X Clear/resetCmd/Ctrl+Shift+C Copy result
About Dummy File Generator
Generate dummy files of a specific size for testing. Generate dummy test files of any size online for free. Choose random bytes, zeros, or lorem ipsum content in various formats to test uploads and network speed. Produces high-quality output using configurable parameters and the browser's native random number APIs. Includes options for customizing format, length, and character sets. Everything runs client-side in your browser for maximum speed and privacy — no data is sent to any server, and no signup is required.
Related tools: File Size Analyzer, Sample JSON Generator, Sample CSV Generator
How to Use Dummy File Generator
- Configure the options and parameters as needed.
- Click Generate to produce the output.
- Copy or download the generated result.
Frequently Asked Questions
What is Dummy File Generator?
Generate dummy test files of any size online for free. Choose random bytes, zeros, or lorem ipsum content in various formats to test uploads and network speed.
Are generated values truly random?
The tool uses the browser's built-in cryptographic random number generator (crypto.getRandomValues) when security matters, and high-quality pseudo-random algorithms for general-purpose generation. This ensures unpredictable, non-repeating output.
Can I customize the output?
Yes, the generator provides controls such as sliders, toggles, and selection menus to fine-tune the output to your exact requirements. Adjust length, character sets, formats, and other parameters before generating.
How are random values generated?
Values are generated entirely in your browser using JavaScript's native APIs. No external service or server call is involved, which means generation is instant and your output is never transmitted anywhere.
Is Dummy File Generator free to use?
Yes, this generator is free to use with no limits on how many values you can create. No signup or account is needed.
Is my data safe when using Dummy File Generator?
Yes, all generation happens in your browser. Nothing is sent to a server, and no generated values are stored or tracked.