Random Hex String Generator

About this tool

Generate cryptographically secure random hexadecimal strings of any byte length. Useful for tokens, salts, session IDs and nonces.

Example

Input: 16 bytes

Output: 32 hex characters, e.g. 3f9a...

Privacy

This tool runs entirely in your browser. Your data is processed locally and never uploaded to a server.

How to use this tool

1. Enter the number of bytes you want the hex string to represent.
2. Choose the format if the tool offers options such as lowercase or uppercase output.
3. Generate the string and copy it into your app, config, or test data.
4. Use the result as a token, salt, nonce, session ID, or other random identifier.

Step by step, what happens

1. The tool takes your requested byte length and treats it as the amount of random data to create.
2. It uses a cryptographically secure random source, so the output is suitable for security sensitive values.
3. Each byte is converted into hexadecimal, which means the final string is twice as long as the byte count in characters.
4. The tool returns the hex string immediately so you can copy it without any extra cleanup.

Worked example

For a 16 byte API token, the tool generates one random hexadecimal string you can paste directly into your app.

Input: 16

1. You enter 16 as the requested byte length.
2. The tool creates 16 random bytes and converts each byte to hex.
3. It returns a 32 character hex string that represents those 16 bytes.

Tips and common mistakes

• Remember that each byte becomes two hex characters, so 32 hex characters means 16 bytes of random data.
• Use this tool for secrets and identifiers, not for passwords that users need to remember.
• If your system expects a specific length, check whether it wants bytes or hex characters before generating the value.
• Store the generated value exactly as shown, because changing case or trimming characters can break comparisons.

Frequently asked questions