KDBX file format

The KDBX format can be conceptually divided into two layers: the outer database with its header, and the compressed and encrypted HMAC block stream containing the inner database with its header.

Encoding

• All numbers are stored in little-endian format, so the 32-bit hex number 0x01234567 will be stored as the byte sequence 67 45 23 01
• All boolean values are stored as a single byte, with 0x00 representing false and 0x01 representing true.
• All UUIDs are stored as 16 bytes in big-endian format, so the UUID 123e4567-e89b-12d3-a456-426614174000 will be stored as the byte sequence 12 3E 45 67 E8 9B 12 D3 A4 56 42 66 14 17 40 00.
• All strings are UTF-8 encoded, so the string Hello 😃 will be stored as the byte sequence 48 65 6C 6C 6F 20 F0 9F 98 83.