UUID Generator

Compact random IDs

Nano ID Generator

Generate Nano IDs online: compact, URL-safe, collision-resistant random identifiers with a configurable length, created privately in your browser.

Your Nano IDV1StGXR8_Z5jdHi6B-myT
By UUID GeneratorUpdated Reviewed for accuracy

Nano ID is a compact, URL-safe random identifier. By default it is 21 characters from a 64-symbol alphabet, giving collision resistance comparable to UUID v4 while being noticeably shorter and safe to drop straight into URLs.

Key takeaways

  • Default Nano IDs are 21 URL-safe characters.
  • Collision resistance is comparable to UUID v4 at the default size.
  • Length is configurable, trading size against collision resistance.

Why Nano ID

Nano ID was designed to be smaller and simpler than a UUID while staying safe in URLs, filenames and DOM ids. It uses a cryptographically strong random source and an unbiased selection algorithm, so shortening the alphabet or length does not skew the output.

It is a strong choice for public-facing identifiers where a 36-character UUID feels heavy and you control both ends of the system.

Choosing a length

The default of 21 characters is a good balance for most applications. Shorter IDs are prettier but raise collision risk as you generate more of them, so tune the length deliberately for high-volume use and keep a database uniqueness constraint either way.

FAQ

Nano ID Generator questions

Is Nano ID better than UUID?

Neither is universally better. Nano ID is shorter and URL-friendly; UUID is standardized with native database support. Choose based on whether compactness or standardization matters more.

How long is a Nano ID?

By default a Nano ID is 21 characters, but the length is configurable. Shorter values increase collision probability as volume grows.

Are Nano IDs secure?

They use a secure random source, but like any identifier they are not secrets. Use a dedicated token for anything that must be unpredictable.

Nano ID Generator - Compact URL-Safe IDs Online