UUID Generator
Generate random UUID v4 identifiers instantly. Bulk generation, copy with one click, and format options — all processed in your browser.
Click Generate to create your first UUID
About This Tool
- Uses crypto.randomUUID() for cryptographically secure generation
- Generate up to 50 UUIDs at once for batch operations
- Choose uppercase/lowercase and with/without hyphens
- Completely free with no registration required
Frequently Asked Questions
A UUID (Universally Unique Identifier) is a 128-bit identifier that is guaranteed to be unique across space and time. It's commonly used as database primary keys, API identifiers, and session tokens.
UUID v4 is a randomly generated UUID. It uses cryptographically secure random numbers to ensure uniqueness. The format is xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where '4' indicates the version.
While theoretically possible, the probability of generating two identical UUID v4s is astronomically low — about 1 in 5.3×10^36. You would need to generate 1 billion UUIDs per second for 85 years to have a 50% chance of one collision.
Yes! It uses the Web Crypto API (crypto.randomUUID) for cryptographically secure random number generation. All UUIDs are generated in your browser — nothing is sent to any server.
Yes, completely free with no registration. Generate as many UUIDs as you need with no limits.