Random String Generator

Generate custom random strings

The Random String Generator creates random strings of any length, using exactly the character sets you choose — uppercase, lowercase, numbers, and symbols. Generate one or up to a hundred at once and copy them all. It uses your browser's cryptographically secure randomness, making it suitable for tokens, test data, and identifiers.

What you can use it for

• API keys and tokens — secure, hard-to-guess identifiers.
• Test data — fill databases and forms with varied values.
• Temporary passwords — when you need many at once.
• Unique codes — coupon codes, references, and short IDs.

How to use it

1. Set the length and how many to generate.
2. Choose the character sets to include.
3. Click Generate, then copy the results.

Choosing character sets

Need	Recommended sets
Readable codes	Uppercase + digits
Secure tokens	All sets, long length
URL-safe strings	Letters + digits (no symbols)
Numeric codes	Digits only

Randomness quality

This generator uses the Web Crypto API where available, producing cryptographically secure random values rather than the predictable output of basic random functions. That matters when the strings are used as secrets or identifiers, where predictability would be a vulnerability. For plain test data, it's simply convenient and fast.

Tips

• Longer strings with more character types are exponentially harder to guess.
• Exclude symbols if the string will appear in URLs or filenames.
• Generate in bulk to seed test datasets quickly.

Private and free

All strings are generated in your browser — nothing is uploaded or stored. The tool is completely free with no sign-up.