You need a suitable software like KeePass from Dominik Reichl to open a KDBX file. The latest version of the KeePass software, KeePass 2.47 can be also installed on Linux and macOS platforms besides the originally supported Windows environment. The KDBX file format was introduced from KeePass 2 onwards.

Additional Information: The initial release of the KeePass software using KDB file extension to store the password details instead of the KDBX file extension.

The contents of the KDBX database can only be decrypted with the help of the master key whose components are hashed using the SHA-256 hash function. Apart from the passwords, the usernames and other notes in the KDBX files are encrypted as well.

The KDBX database is encrypted using the Twofish algorithm that supports the AES (Advanced Encryption Standard). The KDB in KDBX file stands for KeePass DataBase. The database file is given the KDBX extension. Main Use: KeePass is a free password managing application that ensures multiple usernames and associated passwords for Windows, email accounts, websites are securely saved in one database.

KDBX file format is associated with the KeePass software developed by Bruce Schneier. KDBX files mostly belong to KeePass by Dominik Reichl.

Kdbx format