# UUID & ULID tool

Generate UUID v4, time-ordered UUID v7 and ULID identifiers, and read the time inside one.

## How it works

Random values come from your browser’s secure random generator. UUID v7 and ULID start with the creation time in milliseconds.

## Questions

### Which should I use for database keys?

UUID v7 or ULID: they sort by time, which keeps indexes compact and inserts fast.

### Can two IDs collide?

In practice no: each has at least 74 random bits.

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