UUID Generator
Generate random UUID v4 identifiers. Bulk generate up to 100 at once.
Processed locally in your browser
Generated UUIDs
Click Generate to create UUIDs
Frequently Asked Questions
What is a UUID and what is it used for?
A UUID (Universally Unique Identifier) is a 128-bit identifier used to uniquely identify resources in databases, APIs, and distributed systems without requiring a central authority.
Can two UUIDs ever be the same?
While theoretically possible, the probability of a collision with UUID v4 is astronomically low — you would need to generate about 2.71 quintillion UUIDs to have a 50% chance of a single duplicate.
What is the difference between UUID versions?
UUID v1 is based on timestamp and MAC address, v4 is fully random (most commonly used), and v5 uses SHA-1 hashing of a namespace and name. This tool generates v4 UUIDs.
Are UUIDs generated here cryptographically secure?
Yes. This tool uses the Web Crypto API (crypto.getRandomValues) to generate random bytes, ensuring the UUIDs are suitable for security-sensitive applications.