Generate ULID (Universally Unique Lexicographically Sortable Identifier)

Quickly generate ULIDs - timestamp-ordered, lexicographically sortable identifiers for use in databases, software, testing, or anywhere you need unique IDs that maintain chronological order.
No tracking, no uploads, and no limits. Just fast, secure, and private ULID generation.

Generated ULID

Timestamp Options

Custom Timestamp (milliseconds)

Or pick a date/time

Current: - Custom: -

ULID Details

48‑bit time • 80‑bit randomness

10 chars = timestamp 16 chars = random

Timestamp

10 chars ()

Date/Time

derived from timestamp

Random Part

16 chars

Batch Tools

What is a ULID? A ULID (Universally Unique Lexicographically Sortable Identifier) is a 128-bit identifier that combines a timestamp with randomness, making it sortable by creation time.
Sortable: ULIDs sort lexicographically in chronological order, making them perfect for time-series data and distributed systems.
Structure: 48-bit timestamp (millisecond precision) + 80-bit cryptographically strong random data, encoded in Crockford's base32.
How does it work? Generation uses the current timestamp and browser's crypto API for randomness. Everything happens locally, your ULIDs are never sent or stored anywhere.
Limits: No artificial usage limits or tracking. Generate and download as many ULIDs as you need, instantly.
Privacy: Nothing is uploaded, nothing is tracked, and your ULIDs remain on your device.
Have questions, suggestions, or want a new feature? Contact us.