Runs fully in your browser. Inputs stay on your device. See recent fixes on changelog.
Random Bytes Generator
Generate cryptographically secure random bytes in hex or base64.
FreeRuns in browserrandom bytes generatorcrypto random
32
Cmd/Ctrl+Enter Primary actionCmd/Ctrl+Shift+L Load sampleCmd/Ctrl+Shift+X Clear/resetCmd/Ctrl+Shift+C Copy result
About Random Bytes Generator
Generate cryptographically secure random bytes in hex or base64. Generate cryptographically secure random bytes online for free. Choose byte count and output as hex, base64, or byte array format for keys and tokens. 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: Encryption Key Generator, API Key Generator, OTP Generator
How to Use Random Bytes 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 Random Bytes Generator?
Generate cryptographically secure random bytes online for free. Choose byte count and output as hex, base64, or byte array format for keys and tokens.
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 Random Bytes 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 Random Bytes Generator?
Yes, all generation happens in your browser. Nothing is sent to a server, and no generated values are stored or tracked.