How do URL-compatible and hexadecimal formats differ?

The URL-compatible format uses letters, numbers, hyphens, and underscores. The hexadecimal format uses only 0–9 and a–f.

Can I use these strings as real API keys?

The tool uses cryptographically secure randomness, but production keys should still be managed and renewed according to the requirements of the service that uses them.

Can I generate several strings at once?

Yes. Set the desired quantity and each result will appear on a separate line.

Random String Generator

Generate cryptographically secure hexadecimal, alphanumeric, or URL-compatible random strings. Choose a preset or define your own character set.

Files and content are processed locally in your browser and are not uploaded to our server.

About this tool

Generate random strings for API keys, temporary identifiers, file names, and test data. Choose hexadecimal, alphanumeric, or URL-compatible characters, or define your own character set. Each generated string can contain up to 512 characters.

How to use

Hexadecimal, alphanumeric, and URL-compatible presets
Custom character set
Generate several strings at once
Cryptographically secure random generation
Copy one result or the entire list
Choose a format: Select hexadecimal, alphanumeric, URL-compatible, or a custom character set.
Set length and quantity: Choose the number of characters in each string and how many strings to generate.
Generate and copy: Generate the results and copy the strings you need.

Examples

Create OAuth state parameters
Generate hexadecimal values for HMAC testing
Create several temporary identifiers at once
Generate temporary file names or identifiers

Limitations

Maximum length of 512 characters per string
A custom character set must contain at least one character
The results are generated directly in your browser using cryptographically secure randomness and are not sent to a server.

FAQ

How do URL-compatible and hexadecimal formats differ?: The URL-compatible format uses letters, numbers, hyphens, and underscores. The hexadecimal format uses only 0–9 and a–f.
Can I use these strings as real API keys?: The tool uses cryptographically secure randomness, but production keys should still be managed and renewed according to the requirements of the service that uses them.
Can I generate several strings at once?: Yes. Set the desired quantity and each result will appear on a separate line.