UUID Generator
Generate universally unique identifiers in your browser. Supports UUID v4 (fully random, the most common choice) and UUID v7 (time-ordered, great for database keys because values sort by creation time). Generate up to 100 at once, switch between lowercase, uppercase, and no-hyphen formats, and copy individual IDs or the whole list.
Generators
Private by default
This tool runs entirely in your browser. Your data is never uploaded to a server.
How to use
4 clear steps.
Choose the UUID version (v4 random or v7 time-ordered).
Set how many UUIDs you need.
Pick formatting options (uppercase, hyphens).
Copy a single UUID or the entire batch.
Good to know
Frequently asked questions
- What is a UUID?
- A universally unique identifier: a 128-bit value written as 36 characters (e.g. 550e8400-e29b-41d4-a716-446655440000). UUIDs can be generated independently on any machine with a negligible chance of collision.
- UUID v4 vs v7 — which should I use?
- v4 is fully random and fine for most uses. v7 embeds a millisecond timestamp in the high bits, so IDs sort by creation time — much friendlier to database indexes. For new systems that sort or range-scan by ID, prefer v7.
- Can two generated UUIDs collide?
- The probability is astronomically small: v4 has 122 random bits, so you'd need to generate about 2.7×10¹⁸ UUIDs for even a 50% chance of one collision.