UUID generator
Random v4 or sortable v7 identifiers, one or five hundred at a time.
Runs entirely in your browser — nothing you enter is sent to our servers.
v4: fully random, reveals nothing about when it was created.
How it works
UUID v4 is 122 random bits — the usual choice for IDs that shouldn't be guessable. UUID v7 (RFC 9562) starts with a millisecond timestamp, so new values sort after old ones; databases like that because inserts go to the end of the index instead of random pages. Both come from crypto.getRandomValues. Collisions aren't a practical concern at any realistic scale.
FAQ
v4 or v7 for a database primary key?
v7. It keeps B-tree indexes compact because values grow over time. Use v4 when the creation time shouldn't be visible in the ID.
Can two generated UUIDs be the same?
In theory yes, in practice no: you'd need to generate billions per second for years to get a realistic chance of a v4 collision.
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