Random String Generator
Generate random strings from a chosen character set, using a cryptographic source.
Fill in the form and press “Generate” to see the result here.
How to use it
- 1Paste your input into the input box, or type it directly.
- 2Adjust the options if you need something other than the defaults.
- 3The result updates as you type.
- 4Copy the result to your clipboard or download it as a file.
About the Random String Generator
Characters are drawn from the platform’s cryptographic random generator, and draws that would bias the distribution are rejected rather than folded with a modulo - which is the subtle bug in most hand-written generators.
The reported entropy is length × log2(alphabet size). For a value that must resist guessing, 128 bits is the usual target.
Questions people ask
Is your code uploaded to a server?
No. This tool runs entirely in your browser using standard web APIs, so your code never leaves your device. You can confirm it by opening your browser's network panel while the tool runs, or by disconnecting from the internet after the page has loaded.
Is it free, and do I need an account?
Yes, it is free, and there is no account, no sign-up and no watermark on the result. The project is funded by optional donations.