About UUID Generator
What It Does
Generate universally unique identifiers (UUIDs/GUIDs) for databases, APIs, file names, or any system that needs guaranteed-unique IDs.
Versions
- UUID v4 — 122 bits of cryptographic randomness. The most common version. Statistically impossible to collide (~2^61 UUIDs before a 50% chance of one duplicate)
- UUID v7 — RFC 9562 (2024). Embeds a 48-bit millisecond timestamp followed by random bits. UUIDs sort chronologically, making them ideal for database primary keys (better index locality than v4)
Formats
- Standard —
550e8400-e29b-41d4-a716-446655440000 - No hyphens —
550e8400e29b41d4a716446655440000 - Braces —
{550e8400-e29b-41d4-a716-446655440000} - URN —
urn:uuid:550e8400-e29b-41d4-a716-446655440000
Privacy
UUIDs are generated entirely in your browser using the Web Crypto API (crypto.getRandomValues()). Nothing is sent to any server.