ULID Generator

Encoded Timestamp

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Date/Time

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How to use this ULID generator

  1. A new ULID generates automatically when the page loads.
  2. Click "Generate New" for another one anytime.
  3. Click the value to select it, then copy.

What is a ULID?

A Universally Unique Lexicographically Sortable Identifier combines a 48-bit timestamp with 80 bits of randomness, encoded in Crockford's Base32. Unlike a UUID, ULIDs generated later always sort after earlier ones as plain strings.

Why use a ULID instead of a UUID?

Because ULIDs are sortable by creation time, they work better as database primary keys for indexing performance, while still being effectively collision-free like a UUID.

Can I extract the creation time from a ULID?

Yes — the first 10 characters encode the millisecond timestamp, which this tool decodes and displays for you automatically.

Is a ULID case-sensitive?

ULIDs are conventionally uppercase, but Crockford's Base32 is designed to decode correctly regardless of case.