ULID Generator
Generate ULIDs (Universally Unique Lexicographically Sortable Identifiers) instantly. ULIDs combine a 48-bit timestamp with 80 bits of randomness, encoded in Crockford Base32. They sort chronologically, are URL-safe, and are compatible with UUID storage — the best of both worlds.
Frequently Asked Questions
›What is a ULID?
A ULID is a 26-character identifier that encodes a millisecond timestamp (first 10 chars) followed by randomness (last 16 chars) in Crockford Base32. They sort lexicographically by creation time, making them ideal for database primary keys.
›ULID vs UUID — when should I use ULID?
Use ULID when you need time-sortable IDs (great for database indexes and pagination), want shorter strings than UUID (26 vs 36 chars), or need IDs that naturally sort by creation order. Use UUID when you need the standardized RFC 4122 format.
›Can I store ULIDs in a UUID column?
Yes. A ULID is 128 bits, the same as a UUID. You can convert between them and store ULIDs in UUID-typed database columns. Many ORMs and libraries handle this conversion automatically.