What output formats are available?

Base64 encoding, hexadecimal string, and JavaScript byte array format are supported. Choose based on your development needs.

How many bytes can I generate?

You can generate from 1 to 1,048,576 bytes (1MB) per result. Multiple results can be generated in a batch.

Are these bytes cryptographically secure?

Yes! We use the Web Crypto API's getRandomValues() which provides cryptographically strong random values suitable for security applications.

When should I use Base64 vs Hex?

Base64 is more compact and common in web applications. Hex is commonly used in cryptography and low-level programming. Both represent the same binary data.

Can I use this for encryption key testing?

Yes! Generate random bytes for encryption keys, initialization vectors (IVs), salts, and other cryptographic testing purposes.

What's the byte array format?

JavaScript array format like [12, 45, 255]. Useful for Node.js development, testing binary protocols, and working with TypedArrays.

Random Bytes Generator - Base64, Hex, Array Format

About this tool

This tool uses a cryptographically secure pseudo-random number generator (CSPRNG) to ensure fairness and security.

Tip: press Space to generate again.

About Random Bytes Generator

Generate cryptographically secure random bytes for testing. Output in Base64, Hex, or byte array format. Perfect for encryption testing, data generation, and binary simulation. Multiple output formats.

How to Use Random Bytes Generator

1Select byte length
2Choose output format (Base64, Hex, or Array)
3Set how many to generate
4Click 'Generate Bytes'
5Use for security testing

Features

Base64/Hex/Array formats
CSPRNG security
Up to 1MB per result
Batch generation
Crypto testing

Frequently Asked Questions

What output formats are available?: Base64 encoding, hexadecimal string, and JavaScript byte array format are supported. Choose based on your development needs.
How many bytes can I generate?: You can generate from 1 to 1,048,576 bytes (1MB) per result. Multiple results can be generated in a batch.
Are these bytes cryptographically secure?: Yes! We use the Web Crypto API's getRandomValues() which provides cryptographically strong random values suitable for security applications.
When should I use Base64 vs Hex?: Base64 is more compact and common in web applications. Hex is commonly used in cryptography and low-level programming. Both represent the same binary data.
Can I use this for encryption key testing?: Yes! Generate random bytes for encryption keys, initialization vectors (IVs), salts, and other cryptographic testing purposes.
What's the byte array format?: JavaScript array format like [12, 45, 255]. Useful for Node.js development, testing binary protocols, and working with TypedArrays.

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Secure & Private

All generation happens locally in your browser using Web Crypto API (CSPRNG). Your data never leaves your device. No tracking, no storage, complete privacy.