What is NanoID?

NanoID is a secure, URL-friendly, unique string ID generator. It uses a larger alphabet than UUID, enabling shorter strings with equivalent cryptographic strength. Ideal for database primary keys and clean public URLs.

NanoID vs UUID Collision Probability

By default, a 21-character NanoID has a collision rate equivalent to UUID v4. To generate billions of IDs safely without collisions, maintain the size between 21 and 36 characters. All operations run strictly client-side via Web Crypto standard.