Free · No signup · Runs entirely in your browser
UUID Generator
Generate v4 (random) or v7 (time-ordered) UUIDs in bulk, formatted however you like. Every UUID is created locally in your browser — nothing is sent anywhere.
How it works
- Pick a version — v4 for fully random, v7 for time-ordered, or the nil UUID.
- Set how many you need and click Generate.
- Toggle uppercase or hyphen-free formatting, then copy the whole batch.
Frequently asked questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit value, usually written as 32 hex digits in five hyphenated groups, that's designed to be unique across systems without any central coordination. They're commonly used as database keys, request IDs and object identifiers.
What's the difference between v4 and v7?
Version 4 UUIDs are fully random. Version 7 UUIDs embed a millisecond Unix timestamp in the first 48 bits, so they sort chronologically and work well as database primary keys — most of the randomness stays for uniqueness, but the ordering makes indexes and pagination more efficient.
Are these UUIDs random and safe to use?
Yes. Both versions use the Web Crypto API's cryptographically secure random number generator, the same source browsers use for other security-sensitive values, so collisions are astronomically unlikely.
Is anything uploaded when I generate UUIDs?
No. Every UUID is generated locally in your browser using JavaScript — nothing is sent to a server, and nothing you generate here is logged or stored anywhere.
Can I generate many UUIDs at once?
Yes. Set the count field to however many you need, up to 1,000 at a time, choose uppercase or hyphen-free formatting if you want it, then copy the whole batch with one click.