Random String Generator
Generate random strings of any length from the character sets you choose.
How to use the Random String Generator
- Choose the length and how many strings you need.
- Tick the character types to include.
- Click Generate and copy the results.
About the Random String Generator
A random string generator produces unpredictable text for tokens, test fixtures, API keys, file names, coupon codes, database seeds and anything else that has to be hard to guess. Choose a length from 1 to 256 characters, ask for up to 50 strings at once, and tick which character sets to draw from: uppercase letters, lowercase letters, digits and symbols.
Randomness comes from your browser's Web Crypto generator — the same cryptographically secure source used for encryption keys, not the ordinary pseudo-random function that powers things like dice rollers. Each character is picked by reducing a fresh 32-bit random value onto the set you selected. Generation happens entirely in the page, so no string is ever transmitted, logged or stored anywhere.
One detail to know before you rely on it: the symbol set here is deliberately narrow — only -, _, . and ~, the characters that are safe to drop into a URL without escaping. If you want brackets, slashes and punctuation for a password, the password generator uses a much wider symbol set. For identifiers that must be globally unique rather than merely random, a UUID is the better fit.
Frequently asked questions
Are the strings truly random?
They use the Web Crypto secure random generator built into your browser, which is designed for keys and tokens and is far stronger than an ordinary pseudo-random function. No physical process is truly random on a computer, but this is the strongest source available to a web page.
How long can the strings be and how many can I make?
Up to 256 characters each, and up to 50 strings per click. Values outside those limits are clamped to the nearest allowed one.
Which symbols does it use?
Only the hyphen, underscore, period and tilde. These are the URL-unreserved characters, so a generated string can be used in a link or file name without percent-encoding.
Is this the same as a password generator?
It is similar, but the password generator draws on a broader symbol set aimed at password strength rules. Use this one for tokens and test data, and that one for actual passwords.
Is anything sent to your server?
No. The generator runs entirely in your browser, so the strings exist only on your device and are never uploaded, recorded or seen by us.