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.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.