NanoID Generator

NanoID is a random ID designed to be shorter than a UUID while keeping a similar collision probability. Its default alphabet is URL-safe (upper/lowercase letters, digits, '_', '-') at 21 characters, far shorter than a UUID's 36 characters with hyphens, making it popular for URL slugs and frontend component keys.

It depends on both alphabet size and length. At the default 21 characters with a 64-symbol alphabet, generating 1,000 IDs per second would still take hundreds of years before a collision is likely — but dropping to 10 characters shrinks that safety margin significantly. Stick with the default length or longer for IDs you'll use at scale over a long time.

With fewer possible characters at the same length, the collision probability goes up. Use it only for a clear purpose, like a short numeric code (e.g., a 6-digit verification code) — for general-purpose unique IDs, the default alphabet is the safer choice.

Both are fully random. Choose NanoID when you need a short, human-friendly value for URLs or filenames; choose UUID when you need to follow the industry-standard format or interoperate with other systems.

No. Every value is generated on the spot in your browser and is never sent to or stored on a server.