UUID Generator
Generate random UUIDs/GUIDs (v4) instantly. Bulk generation supported.
How to Use This UUID Generator
Generate universally unique identifiers (UUID v4) powered by your browser's cryptographically secure random number generator. All UUIDs are created entirely client-side — nothing is sent to any server.
- Set how many UUIDs you need (1 to 100)
- Toggle uppercase or lowercase formatting
- Choose whether to include hyphens
- Click "Generate New" to create UUIDs
- Click "Copy" on any UUID or "Copy All" for the full list
FAQ
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier that is practically unique across all systems without requiring a central authority. The format is xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where "4" indicates version 4 (random).
Are these UUIDs truly random?
Yes. This tool uses the Web Crypto API (crypto.randomUUID or crypto.getRandomValues) which provides cryptographically secure random numbers, ensuring each UUID is unpredictable and unique.
Can two UUIDs ever be the same?
While theoretically possible, the probability of generating a duplicate UUID v4 is astronomically small. You would need to generate about 2.7 quintillion UUIDs to have a 50% chance of a collision.
What is the difference between UUID and GUID?
UUID (Universally Unique Identifier) and GUID (Globally Unique Identifier) refer to the same concept. UUID is the term used in the RFC 4122 standard, while GUID is the term commonly used in Microsoft technologies.