UUID / GUID generator

Create RFC 4122 v1 and v4 identifiers, RFC 9562 v7 time-ordered UUIDs, or the nil UUID - in bulk for fixtures and tests. Random bytes come from your browser (Web Crypto); nothing is uploaded.

Version

Count

Max 5,000 per run.

Bulk format

Uppercase hex

Hyphens (8-4-4-4-12)

Wrap in {} (GUID style)

Output

v4 and v7 are suitable for opaque IDs; v1 uses a MAC-free random node and clock sequence. Toggle formatting without re-rolling random values. This batch: 0 IDs.

Reference

v4 - Random (RFC 4122 variant 4).
v7 - Unix ms in the first 48 bits, then random (RFC 9562).
v1 - Gregorian timestamp + random clock and node (RFC 4122); not guaranteed globally unique without a real MAC.
Nil - All zeros; useful as a sentinel in tests.