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Nano ID Generator

Generate compact URL-safe unique IDs — shorter than a UUID with comparable collision safety.

To generate Nano IDs, set the length and alphabet above. A 21-character URL-safe Nano ID carries about 126 bits of entropy — comparable to a UUID v4 — in 21 characters instead of 36, which keeps URLs and database keys noticeably shorter.

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

Frequently asked questions

How does Nano ID compare to a UUID?

It is shorter — 21 characters against 36 — while offering comparable collision resistance, and its alphabet is URL-safe so it needs no encoding. UUID wins on universal recognition and database-native types.

How to use the nano id generator

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

Embed this tool

Put the working nano id 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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