$ keepass viewer open a .kdbx database and read its entries
databasewaiting for a file
[ drop a .kdbx here ]
or click to browse — the file is never uploaded
entries
[ ] open a KeePass database (.kdbx, format 3.x or 4.x) to read the credentials inside it.

the file is decrypted in this browser tab with Web Crypto and Argon2 compiled to WebAssembly — the database, the master password and the key file are never sent anywhere, and this page has no server to send them to.

nothing is written back: the database is opened read-only, and everything is dropped from memory when you press lock, reload the page, or leave it idle for ten minutes.