UUID Generator
Generate cryptographically secure v4 UUIDs instantly.
Count: 5
Format
Generated UUIDs
3c422da6-3428-478d-82f1-cf4eaa26415e30780385-e2dd-4e93-bbfe-6a1250e3a598c3ced7e9-4d0c-4259-b28c-fc8398f748f2e047cef4-6e36-410f-9e77-c066c79a8a298ff2cd6e-25f4-439b-a990-2d653d4d3a59How to Use UUID Generator
- Set the count (number of UUIDs to generate) using the slider — up to 20 at once
- Choose your preferred format: Standard lowercase, UPPERCASE, No dashes, or With braces
- Click "Generate" to create a fresh batch of cryptographically secure v4 UUIDs
- Click "Copy All" to copy all generated UUIDs to your clipboard at once
Frequently Asked Questions
What is a UUID and what is it used for?
UUID stands for Universally Unique Identifier — a 128-bit label used to uniquely identify records, sessions, database rows, API keys, and resources in software. They are designed to be unique across all computers and all time without a central registry.
What is the difference between UUID v4 and other UUID versions?
UUID v4 is randomly generated, making it the most common version for general use. v1 uses the machine's MAC address and timestamp (privacy risk). v3 and v5 are hash-based. v4 is recommended when you just need a unique, unpredictable identifier.
Can two UUID v4 values ever be the same?
Theoretically yes, but the probability is so astronomically small it is considered impossible in practice. With 2^122 possible values, you would need to generate billions of UUIDs per second for centuries before seeing a collision.
Is it safe to use these UUIDs in production?
Yes. This tool uses the browser's built-in Web Crypto API (crypto.randomUUID or crypto.getRandomValues) which is cryptographically secure. The UUIDs are generated entirely in your browser — nothing is sent to any server.
Backend tools used alongside UUIDs: