Random String Generator

How to use this random string generator

1. Length, set how many characters each string should have.
2. Character sets, tick lowercase, uppercase, numbers and symbols to shape the pool.
3. How many, choose how many strings to produce at once, then press Generate.
4. Copy any result with its Copy button. Change any field and the list refreshes instantly.

Nothing is submitted or stored: the strings are created on your device and never leave it, so you can produce secrets and keys privately.

Uses for random strings

• API keys. A long random string of letters and numbers makes a strong, hard-to-guess key for services and integrations.
• Tokens. Session tokens, reset tokens and CSRF tokens all rely on unpredictable random values to stay safe.
• Test IDs. Need unique identifiers for test fixtures, sample records or seed data? Generate a batch in one click.
• Salts. Random salts strengthen password hashing by making each stored hash unique, even for identical passwords.

Built on the browser crypto RNG

This tool picks every character with crypto.getRandomValues, the browser cryptographically-secure random number generator, not the weaker Math.random. It uses rejection sampling so each character is chosen uniformly from your selected pool, with no bias toward any value. The result is high-entropy output that is suitable for secrets: a 32-character string drawn from letters and numbers is practically impossible to guess.

Because all of this runs locally, the strings never touch a server. That keeps your keys and tokens private and means the tool keeps working even offline.

Frequently asked questions