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Nano ID Generator

Generate Nano IDs — shorter than a UUID, and URL-safe by design.

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Quick Tool Overview

The Nano ID Generator produces URL-safe identifiers with a length and alphabet you choose, and reports the collision probability for those settings — which is the number that decides how short you can safely go.

What it does
Generates Nano ID identifiers
You give it
A length, an alphabet and a quantity
You get back
IDs plus a collision estimate
Best for
Short public identifiers in URLs and filenames
Developer Tools Free, unlimited use No sign-up Runs in your browser

About the Nano ID Generator

Nano ID is a 21-character identifier over a 64-character URL-safe alphabet, which gives it about 126 bits of randomness — essentially the same as a UUID v4 in nine fewer characters and with no hyphens to escape.

The length and alphabet are both adjustable, which is the point of the format: a shorter ID for something with few rows, a longer one for something with many. The tool reports the collision probability for whatever you choose, expressed as how many IDs you would have to generate per second, for a year, to reach a one-per-cent chance of a single collision. That is a far more useful number than a bit count when you are deciding how short you can safely go.

Key features of the Nano ID Generator

Collision probability, not just bits

How long you could generate at a given rate before a collision becomes likely — far more useful than an entropy figure when choosing a length.

URL-safe by default

The standard 64-character alphabet passes through URLs, filenames and HTML attributes with no escaping.

Any alphabet

Restrict to digits, lowercase or a set you type, for formats with their own constraints.

Cryptographically random

Drawn from the browser’s secure source with rejection sampling, exactly as the reference implementation does.

Bulk output

Up to a thousand at once, one per line, ready to copy or download.

How to use the Nano ID Generator

  1. 1

    Set the length

    21 is the default. Shorter is prettier and riskier; the collision figure quantifies it.

  2. 2

    Choose the alphabet

    The URL-safe default, or restrict it to digits, lowercase or a set you type.

  3. 3

    Read the collision estimate

    How long you could generate IDs at a given rate before a collision becomes likely.

  4. 4

    Generate in bulk

    Produce up to a thousand at once and copy or download them.

Frequently asked questions

A 21-character Nano ID has about 126 bits of randomness against a UUID v4's 122, in 21 characters rather than 36. It is also URL-safe without escaping, which a UUID's hyphens technically are too but look worse.

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