Integer to UUID Converter

Map a 128-bit integer to 16 bytes and canonical UUID text without assigning semantic version meaning.

Unsigned decimal integer (0 through 2^128 - 1)

ReadyEvery 128-bit integer has UUID-shaped hexadecimal text, but arbitrary bits do not necessarily encode a defined RFC UUID version/variant.

Integer to UUID: 128-bit Round-Trip Inspector

Verify the exact 128-bit integer, 32 hexadecimal digits, 16 bytes, UUID-shaped text, version nibble, variant bits and decimal round trip.

128-bit integer ↔ UUID round trip

Pack a non-negative integer into 16 bytes, render canonical UUID text, and reverse the UUID back to its exact unsigned integer value.

Unsigned integerUUID

—128-bit hex

—Range check

Ready.

Full 0 through 2^128 − 1 range

Decimal input is range-checked with BigInt and padded back to 32 hexadecimal digits before UUID grouping. Nil and Max are recognized explicitly without claiming arbitrary bits form a defined UUID version.

RFC 9562 boundary

UUIDs are 128-bit values. Version meaning is interpreted only inside the appropriate variant, and representation conversion never changes the underlying 16 bytes.