KeePassXC is a free, open-source, cross-platform password manager for Windows, macOS and Linux. It stores usernames, passwords, URLs, attachments and notes in an encrypted file that works offline, and it natively supports the KeePass 2.x (.kdbx) format, with import of older KeePass 1 databases. Features include key files and YubiKey challenge-response, auto-type, password strength assessment, breach checks against Have I Been Pwned, passkey support and browser extensions for Firefox, Chrome, Edge and other browsers. It is installed as a desktop application; there is no vendor-hosted service.
KeePassXC is developed by the KeePassXC Team and released under the GNU GPL, with source code on GitHub. The project website names no company, owner or location. Because the database is a local file, where your data resides depends on where you store it. The project states that version 2.7.9 received a security visa from France's ANSSI, and a security review of version 2.7.4 was completed in 2022. European organisations keep full control of their data, but support is community-based.