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Random String Generator

Generate random strings from a chosen character set — for keys, tokens and test data.

To generate random strings, choose a length, a quantity and a character set. All values come from crypto.getRandomValues rather than Math.random, so the output is suitable for API keys, session tokens and anything else that must be unguessable.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Is this random enough for a password?

Yes, when generated here — it uses the browser's cryptographic random source, not Math.random. That distinction matters: Math.random is predictable from a few outputs and must never generate anything secret.

How long should a random string be?

It depends on the alphabet. With 62 alphanumeric characters, each adds about 5.95 bits, so 22 characters gives roughly 128 bits — the usual target for something that must not be guessed.

How to use the random string generator

  1. 1Set the length.
  2. 2Set the how many.
  3. 3Choose the character set.
  4. 4The result appears immediately — copy or download it.

Embed this tool

Put the working random string generator on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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