UUID Generator

Generate random UUIDs (v4) instantly. Click to copy, generate in bulk, or customize the format.

— Click to copy
Include hyphens
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What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. Also known as a GUID (Globally Unique Identifier), UUIDs are used as database primary keys, session tokens, API request IDs, file names, and distributed system identifiers. Version 4 UUIDs are randomly generated and have a virtually zero chance of collision.

UUID v4 Format

A UUID v4 follows the pattern xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where x is any hex digit and y is one of 8, 9, a, b. The 4 indicates version 4 (random), and the y bits indicate the variant. Example: 550e8400-e29b-41d4-a716-446655440000.

How to Use

  1. Click Generate New or press Space to create a UUID
  2. Click the UUID to copy it to your clipboard
  3. Use Generate Bulk to create multiple UUIDs at once (up to 1,000)
  4. Customize format: uppercase/lowercase, with/without hyphens
  5. Choose a separator for bulk output: newline, comma, space, or JSON array