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NanoID Generator
Generate compact, URL-safe random identifiers.
Tool Panel
Processed locallyAbout NanoID Generator
NanoIDs with adjustable length and alphabet, drawn from the browser crypto source — good for short IDs and invite codes.
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Defaults to 21 characters over the 62-character `0-9A-Za-z` alphabet: about **125 bits** of entropy, slightly more than a UUIDv4's 122, at a bit over half the length. Randomness comes from `crypto.getRandomValues`, not `Math.random`.
- 2
The alphabet is yours to change: drop `0O1lI` to avoid transcription mistakes, or switch to digits and capitals for a serial number — length and character set are both adjustable.
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Sampling uses rejection rather than modulo, so the distribution is uniform (the old `byte % 62` left the most and least frequent characters 1900 samples apart over 400k draws; it is now around 400).
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Set the length
Each extra character adds about 5.95 bits; 21 is the default, while 8–10 suits short links where collisions are tolerable.
- 2
Optionally change the alphabet
Leave it empty for the 62-character default, or supply your own characters (ambiguity-free, digits only, caps only).
- 3
Generate and copy
One click produces one id in the text area below, ready to copy.
Work backward from the uniqueness you need: 21 characters (125 bits) stays collision-negligible even across billions of ids, while 8 characters is only about 47.6 bits and can collide within a few hundred thousand. Short-link style uses usually pair it with a database uniqueness check.
As a **token**, yes — the randomness is sound (a `crypto` source with uniform sampling) — but it is an identifier, not a password. Treat it server-side as an unguessable random string: store only a hash, give it an expiry, rate-limit it. For a human-typed password, use the password generator, which weighs length against memorability.
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