UUID v4 Generator
Generate UUID v4 (universally unique identifiers) instantly. Create single or bulk UUIDs with one click — 100% client-side, no server, free to use.
Frequently Asked Questions about UUID Generation
How do I generate a UUID online?
Simply click the Generate button to create UUID v4 identifiers. You can generate up to 100 UUIDs at once and copy them individually or all at once.
What is a UUID v4?
UUID v4 (Universally Unique Identifier version 4) is a 128-bit identifier generated using random or pseudo-random numbers. It follows the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where 4 indicates version 4 and y is one of 8, 9, a, or b.
Are UUID v4 values truly unique?
While not 100% guaranteed unique, the probability of a collision is astronomically low. With 122 random bits, you would need to generate about 2.71 quintillion UUIDs to have a 50% chance of a single collision.
Is this UUID generator secure?
Yes, UUIDs are generated using your browser's crypto.getRandomValues() function, which provides cryptographically secure random numbers. No data is sent to any server.
Can I generate UUIDs in bulk?
Yes, set the count slider to generate up to 100 UUIDs at once. Use the Copy All button to copy all generated UUIDs to your clipboard, separated by newlines.
What are UUIDs commonly used for?
UUIDs are used as database primary keys, session identifiers, API request IDs, file names, transaction IDs, and anywhere a unique identifier is needed without central coordination.