Tools Blog

ULID Generator

Scan to open this page

Convert

Generate up to 1000 ULIDs at once with the embedded timestamp shown next to each one — no separate decode page — plus ULID-to-UUID and UUID-to-ULID conversion on the same screen.

How it works

  1. A ULID appears immediately on load, with its embedded timestamp shown alongside it
  2. Set a count (up to 1000) to generate a batch, each line paired with its timestamp
  3. Paste a ULID or UUID into the convert boxes to get the other format instantly, with no value loss

Frequently asked questions

How is a ULID different from a UUID?

A ULID's first 48 bits are a millisecond timestamp, so ULIDs sort in creation order — and its 26-character Base32 form is shorter and URL-safe compared to a 36-character UUID.

How do I see a ULID's timestamp?

It's shown automatically next to every generated ULID — no separate decode tool needed.

Can I migrate existing UUIDs to ULID?

Yes — paste a UUID into the convert box and it converts to ULID form with no value loss (a v4 UUID has no real timestamp, so the converted ULID's timestamp portion is just the UUID's original random bits, not an actual creation time).

How many can I generate at once?

Up to 1000 per batch, downloadable as a .txt file.

Is anything sent to a server?

No — generation and conversion both run entirely in your browser.

#UlidGenerator#UlidToUuidConverter#UlidDecodeTimestamp#BulkUlidGenerator#UlidVsUuidWhichToUse

Related tools

UUID v4 Generator UUID v4 Generator Unix Timestamp Converter Unix Timestamp Converter

From the blog

Most ULID generators split generate, decode, and UUID conversion into separate pages. We didn't.
dev

Most ULID generators split generate, decode, and UUID conversion into separate pages. We didn't.

One ULID site only generates one at a time and buries bulk generation on a separate page. Another has no decoder at all. We put generation, timestamp decoding, and UUID conversion on one screen.

2026-08-30

Update history

  • 2026-09-03 Bounded numeric fields are now sliders instead of number inputs.
  • 2026-08-30 Added: a cover image (a staircase of timestamped ID cards next to a two-way arrow pointing to a UUID-shaped block) — used as the card thumbnail, social share image, and blog title image.
  • 2026-08-30 Launched: live ULID generator (no button) — bulk generation up to 1000 with embedded timestamps shown inline, plus ULID↔UUID lossless conversion, entirely client-side.