Generate ULID
Click Generate
Batch Generate
Decode ULID
📖 ULID Format
01ARZ3NDEKJ00Y7YFDS1A14R
← 10 chars: Timestamp (ms)
16 chars: Random →
- 128--bit compatible with UUID
- Lexicographically sortable (time-ordered)
- Crockford's Base32 encoding (no I, L, O, U)
- 1.21e+24 unique IDs per millisecond
- Monotonic sort within same ms