All UUIDs are generated locally using your browser's cryptographically secure random number generator. Nothing is sent to any server.
Version
Format
Click "Generate UUIDs" to create identifiers
Version: —
Count: —
Format: —
Generated at: —
UUID v4
RFC 9562
- Source
- 122 random bits from CSPRNG
- Sortable
- No — random order
- Unique
- 2¹²² possible values (~5.3×10³⁶)
- API
crypto.randomUUID()- Best for
- General-purpose IDs, session tokens, one-off identifiers
Structure
xxxxxxxx
-
xxxx
-
4xxx
-
yxxx
-
xxxxxxxxxxxx
random
version (4)
variant bits
UUID v7
RFC 9562
- Source
- 48-bit Unix timestamp (ms) + 74 random bits
- Sortable
- Yes — lexicographically & chronologically
- Unique
- Monotonically increasing within same millisecond
- API
- Custom inline implementation (no browser API yet)
- Best for
- Database primary keys, event IDs, log correlation — anything needing time-sortable IDs
Structure
unix_ts_ms
-
ts_ms
-
7xxx
-
yxxx
-
xxxxxxxxxxxx
timestamp (ms)
version (7)
variant bits
random