Keys & Generators
UUID / ULID Generator
Bulk UUID v4, time-ordered UUID v7 and ULID, and an inspector that reads embedded timestamps.
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About the UUID / ULID Generator
Generate up to 10,000 random UUID v4, time-ordered UUID v7 or ULID values at once, from a cryptographically secure source. The inspector identifies the version and variant of any UUID and reads the creation time embedded in v1, v6, v7 and ULID identifiers.
How to use it
- Choose UUID v7, UUID v4 or ULID.
- Set how many and the formatting.
- Generate, then copy or download.
Frequently asked questions
- UUID v4 or v7?
- Use v7 for database primary keys: it sorts by creation time, which keeps indexes compact. Use v4 when IDs must not reveal when they were created.
- Can two generated UUIDs collide?
- In practice, no. A v4 UUID has 122 random bits; you would need billions of IDs per second for decades to expect a collision.
- Are the IDs generated securely?
- Yes, from crypto.getRandomValues in your browser.