🔢 UUID Generator
a1b2c3d4-e5f6-4789-0123-456789abcdef
What Is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit unique identifier. UUID v4 is randomly generated with 122 random bits, making collisions astronomically unlikely.
Common Uses
- 🗄️ Database primary keys — avoid sequential ID guessing
- 🔗 API identifiers — uniquely identify resources
- 📦 Order/session IDs — unpredictable transaction IDs
- 🧪 Testing — generate unique test data
Frequently Asked Questions
Are UUIDs truly unique?▾
UUID v4 uses 122 random bits. You'd need 1 billion/second for 85 years for a 50% collision chance.
What's the difference between versions?▾
v1 uses time+MAC, v3/v5 use hashing, v4 (ours) uses random numbers. v4 is most common.