UUID Generator

Generate random UUID v4 values instantly. Choose a count, pick a format, and copy to clipboard with one click.

1 UUID
adab050c-0d60-4b7e-b2ca-e46a6d307ded

What Is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit value used to uniquely identify information in computer systems. Also known as a GUID (Globally Unique Identifier), UUIDs are standardized by RFC 4122. The most common version, UUID v4, is generated using random or pseudo-random numbers, making collisions extremely unlikely.

UUID v4 Format

A UUID v4 follows the pattern xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where each x is a random hexadecimal digit and y is one of 8, 9, a, or b. The 4 indicates the UUID version. Example:

550e8400-e29b-41d4-a716-446655440000

Common Use Cases

  • Database primary keys — UUIDs provide unique IDs without a central authority or auto-increment sequence.
  • Distributed systems — Multiple services can independently generate IDs without coordination.
  • Session tokens — Random UUIDs work well as session identifiers in web applications.
  • File naming — Ensure unique filenames for uploads or temporary files.
  • API request tracing — Attach a UUID to each request for logging and debugging across microservices.

How to Use This Generator

  1. Select a count — Choose how many UUIDs to generate at once (1, 5, 10, 50, or 100).
  2. Pick a format — Standard (with dashes), no dashes, uppercase, or lowercase.
  3. Click Generate — New UUIDs appear instantly.
  4. Copy — Click Copy on any single UUID, or Copy All to grab the entire list.

All UUIDs are generated entirely in your browser using the Web Crypto API. No data is sent to any server.