UUID Generator (v1/v4)
Why Use Our UUID Generator?
Multiple Versions
Generate both version 1 (time-based) and version 4 (random) UUIDs according to RFC 4122.
Custom Formatting
Control the output format with options for uppercase, hyphens, and braces.
Batch Generation
Generate multiple UUIDs at once for your development and testing needs.
How It Works
Select UUID Version
Choose between version 1 (time-based) or version 4 (random) UUIDs.
Set Formatting Options
Customize the output with options for uppercase, hyphens, and braces.
Generate & Copy
Generate UUIDs and copy them to your clipboard with one click.
Frequently Asked Questions
UUID version 1 is time-based and includes the MAC address of the generating computer, while version 4 is randomly generated. Version 1 UUIDs can be traced back to their origin, while version 4 UUIDs are completely random.
Yes, all generated UUIDs follow the RFC 4122 specification for Universally Unique Identifiers.
Yes, this tool works completely in your browser with no server communication, so you can use it offline.
Version 4 UUIDs have 122 random bits, making the probability of duplication extremely low. Version 1 UUIDs combine timestamp and MAC address for uniqueness.
Note: All UUID generation happens in your browser. No data is uploaded to any server.
Maximum recommended batch size: 100 UUIDs at once for performance.