• Generates UUID v4 (random UUID).
• Uses the browser's crypto.randomUUID() API.
• Generated UUIDs are globally unique.
🔑 What is UUID Generator?
UUID (Universally Unique Identifier) is a 128-bit identifier that is globally unique. This tool generates UUID version 4 (random), with astronomically low collision probability making it practically unique. Used for database primary keys, API tokens, session IDs, filenames, and anywhere duplicates are not allowed. Powered by Web Crypto API for cryptographically secure random number generation.
📊 UUID Version Comparison
| Version | Generation Method | Characteristics |
|---|---|---|
| v1 | Time + MAC address | Traceable, security concerns |
| v4 ✓ | Random (this tool) | Most widely used, untraceable |
| v5 | Namespace + SHA-1 | Same input = same UUID |
| v7 | Time + random | Sortable, newest standard |
💡 UUID Usage Tips
- Database keys: Use UUID instead of auto-increment for distributed systems
- Case sensitivity: Spec says case-insensitive, but maintain consistency
- No dashes: Use when a 32-character continuous string is needed
- URL safe: UUIDs can be safely included in URLs
Frequently Asked Questions
Can UUIDs ever collide?▼
UUID v4 collision probability is 1 in 2^122. You would need to generate 1 billion per second for 85 years to reach 50% probability. Practically, collisions never occur.
What is the difference between GUID and UUID?▼
GUID (Globally Unique Identifier) is Microsoft terminology for UUID. They are identical in format and generation method.
What is the UUID format?▼
The format is xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx. The 4 indicates version (v4), and y is one of 8, 9, a, or b.
What is UUID Generator?
Generate universally unique identifiers (UUIDs) in version 1 (time-based) or version 4 (random) formats. Create multiple UUIDs at once for databases, APIs, and applications.