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Developer Tools

UUID Generator

Generate cryptographically secure RFC 4122 Version 4 UUIDs individually or in bulk.

RFC 4122 v4 UUIDs (5)
486a5d80-971d-467e-90c1-03805473effd
a7af9982-24a7-455f-9af0-ef1df9b88424
a6892643-4c0a-43d1-88bb-fb22ecbe12c6
d72b62a9-3384-425a-8754-5534541256cb
1cae75a4-2bed-4bb9-9077-4f62638ea2f8
Runs 100% locally in your browser. Zero data transmission.

How It Works & Underlying Concept

A Universally Unique Identifier (UUID) is a 128-bit label used for information in computer systems. Version 4 UUIDs are generated using cryptographically strong pseudo-random numbers, offering negligible collision probability across distributed systems.

Mathematical Formula / RuleFormat: 8-4-4-4-12 hex digits (36 characters total). Version bit set to 4; variant bits set to 10xx.
Quick Instructions
1Select how many UUIDs you need (1 to 50).
2Select your formatting preferences (hyphens, uppercase, braces).
3Click 'Generate UUIDs' and copy the output.

Key Capabilities

  • Generates RFC 4122 Version 4 universally unique identifiers
  • Bulk generation from 1 up to 50 UUIDs at a time
  • Formatting toggles: uppercase/lowercase, omit hyphens, add braces {}
  • Cryptographically secure randomness via browser crypto API
Real-World Example

Database Primary Keys

A developer setting up database test fixtures needs 5 unique identifier keys.

Step 1:Set count to 5.
Step 2:Leave hyphens enabled.
Step 3:Click Generate.
Result: Produces 5 unique UUIDs like 'a8098c1a-f86e-11da-bd1a-00112444be1e'.
Technical Notes & Limits
  • Generates Version 4 (random) UUIDs. Version 1 (timestamp) or Version 5 (SHA-1 namespace) are not generated here.

Frequently Asked Questions

Can two generated UUID v4 identifiers collide?▾
The total number of possible UUID v4 values is 2^122 (approximately 5.3 × 10^36). The probability of a collision is so infinitesimally small that it is effectively zero in real-world systems.
Is a GUID the same thing as a UUID?▾
Yes, GUID (Globally Unique Identifier) is Microsoft's implementation of the standard UUID specification.

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