What is a hexadecimal number?

Hexadecimal (base-16) uses digits 0-9 and letters A-F. Each byte produces 2 hex characters. Commonly used in programming for representing binary data.

What does byte length mean?

Each byte equals 2 hexadecimal characters. For example, 4 bytes = 8 hex characters (like '1A3F5C7E'). You can generate from 1 to 1024 bytes.

Should I add the 0x prefix?

Add 0x prefix if you're using the hex values in code (like 0x1A3F). Omit it if you just need the raw hex string for data or configuration.

Are these hex values secure?

Yes! We use cryptographically secure random generation, making these hex values suitable for testing security features and generating test tokens.

Can I use this for color codes?

Yes! 3 bytes gives you 6 hex digits (like 1A3F5C) which is perfect for RGB color codes. For 8-digit colors with alpha, use 4 bytes.

What's the difference between uppercase and lowercase hex?

Purely cosmetic - hex values are case-insensitive. A-F and a-f represent the same values. Choose based on your coding style or requirements.

Random Hexadecimal Number Generator - Developer Tools

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 Hex Generator

Generate random hexadecimal numbers for developers. Specify byte length and optionally add 0x prefix. Perfect for testing, data generation, and programming. Cryptographically secure generation for developers.

How to Use Random Hex Generator

1Set the byte length (1-1024)
2Enable 0x prefix if needed
3Set how many to generate
4Click 'Generate Hex'
5Copy for your project

Features

Custom byte length
Optional 0x prefix
Batch generation
CSPRNG security
Developer friendly

Frequently Asked Questions

What is a hexadecimal number?: Hexadecimal (base-16) uses digits 0-9 and letters A-F. Each byte produces 2 hex characters. Commonly used in programming for representing binary data.
What does byte length mean?: Each byte equals 2 hexadecimal characters. For example, 4 bytes = 8 hex characters (like '1A3F5C7E'). You can generate from 1 to 1024 bytes.
Should I add the 0x prefix?: Add 0x prefix if you're using the hex values in code (like 0x1A3F). Omit it if you just need the raw hex string for data or configuration.
Are these hex values secure?: Yes! We use cryptographically secure random generation, making these hex values suitable for testing security features and generating test tokens.
Can I use this for color codes?: Yes! 3 bytes gives you 6 hex digits (like 1A3F5C) which is perfect for RGB color codes. For 8-digit colors with alpha, use 4 bytes.
What's the difference between uppercase and lowercase hex?: Purely cosmetic - hex values are case-insensitive. A-F and a-f represent the same values. Choose based on your coding style or requirements.

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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.