NanoID & ULID Generator β Short, Unique, Sortable IDs
Generate cryptographically random NanoIDs (21 URL-safe characters) and ULIDs (26 characters, time-sortable). Choose how many and copy each or all at once.
π Runs entirely in your browser. Your input and output are never sent to a server or stored β fully private.
About this tool
Generate compact, collision-resistant unique IDs without a server. NanoID gives you a short 21-character, URL-safe string, while ULID produces a 26-character identifier that sorts by the time it was created. Both are modern alternatives to the longer UUID and slot easily into databases, URLs and file names. Every ID is created in your browser using its secure random source, so nothing is generated remotely or sent anywhere β make one at a time or a whole batch at once.
Frequently asked questions
How are NanoID, ULID and UUID different?
All three are unique identifiers, but they trade off size and features. A UUID v4 is 36 characters and fully random. NanoID does much the same job in just 21 URL-safe characters, so it is shorter while keeping similar collision resistance. ULID is 26 characters and puts a timestamp at the front, which makes a batch of them sortable by the order in which they were created.
When should I choose ULID over NanoID?
Choose ULID when you want IDs that sort in chronological order. Because the first part of a ULID is a millisecond timestamp, sorting them as plain text also puts them in the order they were created β useful for database primary keys, logs and event streams where insertion order matters. If you only need a short, random ID and do not care about ordering, NanoID is the simpler pick.
Where are the IDs generated?
Entirely in your browser. Both NanoID and ULID draw on the crypto.getRandomValues secure random source on your device, so the identifiers are never produced on a server and nothing about them is uploaded or stored. Once the page has loaded you can keep generating as many as you like, even offline.