ULID Generator
Generate lexicographically sortable, timestamp-based ULIDs in bulk.
Knowledge Base & Educational Companion: ULID: Sortable Unique IDs
A ULID is a 128-bit identifier that combines a 48-bit timestamp with 80 bits of randomness, encoded in Crockford Base32. Unlike UUID, ULIDs sort naturally by creation time.
1. Time-Ordered by Design
The leading timestamp means ULIDs generated later always sort after earlier ones as plain strings, which keeps database indexes compact and inserts fast.
2. Crockford Base32
ULIDs use a 26-character Base32 alphabet that omits ambiguous letters (I, L, O, U), making them safe to read aloud, type, and embed in URLs.
3. UUID Compatibility
At 128 bits, a ULID carries the same collision resistance as a UUID while adding sortability — a drop-in upgrade for primary keys and event logs.
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