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All toolsUUID Generator
Generate browser-native UUID v4 identifiers instantly.
Generate UUIDs
6061c87b-75e1-4879-8512-30417fb26d1d 8687c56f-55cb-40b9-9499-2cde789ced75 35179543-f220-45e6-bbc5-b02e36712964 c541bb88-d655-4fe8-854f-68294cf6dcb3 fac92054-537b-40c5-9f6b-decaa237b394
Frequently asked questions
- What's the difference between UUID v4 and UUID v7?
- UUID v4 is fully random and has no time ordering, while UUID v7 embeds a millisecond timestamp at the front so values sort chronologically. v7 is better for database primary keys; v4 is the safe default elsewhere.
- Are UUIDs guaranteed to be unique?
- Not guaranteed, but the 122 bits of randomness in a v4 UUID make collisions astronomically unlikely - you can generate billions per second for decades without a clash. Treat them as unique in practice.
- Can I use a UUID as a URL slug?
- Yes, UUIDs are URL-safe out of the box because they only contain hex digits and hyphens. They are long, though, so a shorter ID format like NanoID may read better for user-facing links.