ULID Generator

Universally unique, lexicographically sortable identifiers. 26 characters of Crockford Base32 — 48-bit millisecond timestamp + 80 random bits. Generated locally, no network.

Specv1.0
Length26 ch
Random80 bits

Casing

Monotonic

Count

10 · ULID · monotonic

click regenerate

Anatomy

  01H8XGJWBK    P4QY3R5N6Z7T8V
  └────┬───┘    └─────┬──────┘
  10 chars       16 chars
  48-bit ms      80 random bits

Crockford Base32 — excludes I L O U to avoid visual ambiguity. Lex ordering equals time ordering — perfect for primary keys.

Generated client-side. ULID spec v1.0.