Compatibility Compatibility of KeePass editions.

KDBX files (created by KeePass 2.x) and KDB files (created by KeePass 1.x) are not compatible, because KeePass 2.x supports more features than KeePass 1.x.

However, KeePass 2.x can import KDB files created by KeePass 1.x. For this, you first need to create a new database in KeePass 2.x and then import the 1.x database via 'File' → 'Import'.

Via 'File' → 'Export', KeePass 2.x can also export data to 1.x KDB files. However, note that not all 2.x fields are supported by 1.x (i.e. the export is lossy).