UUID Generator
Generate cryptographically random version 4 UUIDs — one at a time or in bulk — and copy them with one click.
Frequently asked questions
What is a version 4 UUID?
A 128-bit identifier where 122 bits are random, formatted as 36 characters (8-4-4-4-12). The 4 in the third group marks the version; the variant bits appear at the start of the fourth group.
Can two UUIDs collide?
In theory yes, in practice no: with 122 random bits you would need to generate about 2.7 quintillion UUIDs to reach a 50% chance of a single collision.
Are these UUIDs secure?
They are generated with the browser's crypto API, which uses a cryptographically secure random source. Still, UUIDs are identifiers, not secrets — do not use them as passwords or tokens.