ULID Generator & Decoder
Generate ULIDs — 26-character Crockford Base32 IDs with millisecond timestamp plus 80-bit randomness, lexicographically sortable. Bulk generation and ULID-to-timestamp decoder included.
Generate (26-char, lexicographically sortable)
Results
Press Generate. 48-bit millisecond timestamp + 80-bit crypto randomness.
Decode ULID → timestamp
Invalid ULID — 26 chars, Crockford Base32 (no I, L, O, U).
How to use
- Paste input or drop a file above.
- Adjust options (delimiter, dialect, quality, ratio).
- Copy result or download — no sign-up needed.
FAQ
ULID vs UUID v7?
Both are sortable time-ordered IDs. ULID is 26 URL-safe characters; UUID v7 is the 36-char standard format. Pick by ecosystem fit.
Are generated ULIDs unique?
80 bits of crypto randomness per ID makes collisions practically impossible.