Free Online ULID Generator

The ULID generator produces 26-character lexicographically sortable identifiers — a timestamp prefix plus a cryptographically random suffix, encoded in Crockford Base32.

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How to Use This Developer Tool

  1. Choose how many ULIDs you want (1–100).
  2. Click Generate.
  3. Each ULID is timestamped from the moment of generation.
  4. Click Copy All to send the whole list to your clipboard.

What Is an ULID Generator?

ULIDs are an alternative to UUIDs when you want primary keys that sort by creation order. The first 10 characters encode the creation timestamp in milliseconds; the last 16 characters are crypto-grade random. Sort ULIDs alphabetically and they come out in chronological order — useful for database indexes (where insert order matters for write performance), log entries, and any place you'd otherwise reach for `created_at` plus a random tiebreaker.

This generator produces 1 to 100 ULIDs at a time using `crypto.getRandomValues` for the random component. The encoding is Crockford Base32 (no I, L, O, or U) so values stay legible when typed or read aloud.

Frequently Asked Questions

What is a ULID?
A 26-character ID: 10 chars timestamp (milliseconds), 16 chars random. Lexicographically sortable = chronological order. Crockford's Base32.
When to use ULID over UUID?
When you need sortable IDs (database primary keys, logs). ULIDs order by creation time. UUIDs are random, not sortable.
Is ULID case-sensitive?
ULID uses uppercase Crockford Base32 (no I, L, O, U to avoid confusion). Standard is uppercase; case-insensitive for parsing.

Published by the WeGotEveryTool team. We build and test every tool in-house and update pages when the underlying spec, formula, or recommendation changes.

Reviewed: May 2026. Disclaimer: this tool is provided as-is for general informational use. For decisions with material consequences (medical, legal, financial, security) verify results against a qualified professional source.

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