Generate multiple UUIDs in versions 1, 3, 4, and 5 with custom namespace options.
UUID Generator
Generate multiple UUIDs in versions 1, 3, 4, and 5 with custom namespace options.
About UUID generation
Choose the right UUID version
Version 1 and version 4 can generate batches without a name value. Version 3 and version 5 derive a deterministic UUID from the same name and namespace, using the built-in DNS or URL namespace or a valid custom namespace UUID.
Local output for copy or download
The identifiers are created in your browser and returned as newline-separated text for quick copying or download. Version 3 uses MD5 and version 5 uses SHA-1 as UUID namespace algorithms, so treat them as identifier formats rather than password or signature hashing recommendations.
FAQ
Common questions and answers about this topic.
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify information in computer systems without requiring central coordination.
What UUID versions are supported?
Version 1 (time-based), Version 3 (namespace with MD5), Version 4 (random), and Version 5 (namespace with SHA-1) are all supported.
Are generated UUIDs truly unique?
Yes, the probability of collision is negligibly small. UUID v4, for example, has 2^122 possible values, making duplicates virtually impossible.
Is my data sent to any server?
No, UUID generation happens entirely in your browser. The identifiers are created locally with JavaScript — no data is sent to any server.