UUID Toolkit

Online Nano ID Generator

Generate compact, URL-friendly random identifiers. Cryptographically secure with configurable length.

Generate Nano ID

Compact, URL-friendly random identifier.

About Nano ID

Nano ID generates URL-friendly, cryptographically secure random strings using A-Za-z0-9_-.

  • Default 21 characters = ~126 bits of entropy
  • No timestamp, fully random
  • Shorter and more URL-safe than UUID
  • Configurable length (4-128 chars)

What is Nano ID?

Nano ID is a compact, URL-friendly unique identifier generator. It produces random strings using the alphabet A-Za-z0-9_- (64 characters), powered by the Web Crypto API for cryptographic security.

The default length of 21 characters provides approximately 126 bits of entropy, comparable to UUIDv4's 122 bits but in a much shorter string. Unlike UUIDs, Nano IDs contain no hyphens, no version bits, and no fixed structure, making them ideal for use in URLs, filenames, and HTML attributes.

Nano ID vs UUID

Comparison of Nano ID and UUID formats
Feature Nano ID UUIDv4
Default length 21 chars 36 chars
Entropy ~126 bits 122 bits
URL-safe Yes (no encoding needed) Yes (but longer)
Configurable length Yes (4-128+) No (fixed 36)
Standard / RFC No RFC 4122

Frequently Asked Questions

How long should my Nano ID be?
The default 21 characters is suitable for most applications. For very high-throughput systems, consider 24+ characters. For short-lived or low-volume use cases like invite codes, 10-12 characters may be enough.
Is Nano ID cryptographically secure?
Yes. Nano ID uses crypto.getRandomValues() in the browser and crypto.randomBytes() in Node.js.
Is my data sent to a server?
No. Nano IDs are generated entirely in your browser. Nothing is sent to any server.