UUID Generator
Generate cryptographically random UUID v4 identifiers — all generated in your browser using the Web Crypto API.
crypto.getRandomValues() (CSPRNG). Each UUID has 122 bits of randomness, making collisions practically impossible.Guides for this tool
Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit value, usually shown as 32 hexadecimal digits in five groups. It is designed to be unique across systems without a central authority, making it ideal for database keys and IDs.
What is a version 4 UUID?
A version 4 UUID is generated from random numbers. This tool uses the browser's cryptographically secure random source, so the chance of two generated UUIDs colliding is effectively zero.
Can I generate many UUIDs at once?
Yes. You can generate multiple UUIDs in a single click and copy them together, which is useful for seeding databases or creating test data.
Are these UUIDs truly unique?
Version 4 UUIDs are not guaranteed unique but the probability of a collision is so small it is negligible for virtually all applications. They are safe to use as primary keys and identifiers.