UUID Generator

Generate UUID v4 instantly — bulk, free, no sign-up.
Everything runs in your browser. Nothing is uploaded or stored.

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit identifier displayed as 32 hexadecimal digits in five groups separated by hyphens — for example 550e8400-e29b-41d4-a716-446655440000. Developers use UUIDs as database primary keys, session identifiers, request/trace IDs, file names, and idempotency keys, because they can be generated anywhere without a central authority and still stay unique.

Why UUID v4?

UUID version 4 is built from cryptographically random data (122 random bits). The probability of generating the same UUID twice is so low that it is treated as impossible in practice — you would need to generate billions per second for centuries to expect a single collision.

How to use this generator

  1. Choose how many UUIDs you need (1 to 100).
  2. Optionally switch on UPPERCASE or turn hyphens off.
  3. Click Generate UUIDs, then copy them all or download a .txt file (one UUID per line).

FAQ

Is it free? Yes, completely free with no sign-up.
Is it private? Yes. This page uses your browser's Web Crypto API (crypto.randomUUID()). No UUID ever leaves your device.
Can I use these UUIDs in production? Yes. They are standard RFC 4122 version 4 UUIDs, suitable for databases and APIs.