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ULID Generator

Create a 26-character, time-sortable ULID with secure randomness.

ulid-generatorLOCAL WORKSPACE

Enabling local controls…

Input

Collision probability

ULID: 48-bit millisecond timestamp + 80-bit randomness. Monotonic within this page session; clock rollback retains the last timestamp and same-millisecond randomness overflow fails. Ordering does not extend across tabs or reloads. Collision risk depends on independent generators per millisecond, not an all-time birthday bound.

NanoID uses 64 URL-safe symbols and secure randomness. Processing stays in this browser; nothing is uploaded or stored. NanoID · ULID specification

Result

Run the tool to see its result here.

How to use this tool

Generate a new identifier for each record; compare ordering only within a consistent clock context.

When not to use it

ULIDs are public identifiers, not authorization tokens or proof of exact creation order.

Read the guide →