KeePassXC is an open-source, cross-platform password manager designed for users who demand maximum control over their sensitive data. It stores usernames, passwords, URLs, attachments, and notes in an encrypted KDBX database that never leaves your device, eliminating cloud dependency and third-party risks. Built for power users and privacy-conscious individuals, it offers enterprise-grade security without subscriptions or ads.
Built in C++ with Qt, KeePassXC supports KDBX3/KDBX4 formats, integrates with browsers like Chrome, Firefox, and Edge via browser extensions, and provides CLI access, SSH agent integration, and FreeDesktop Secret Service compatibility. It runs natively on all major desktop OSes and supports YubiKey/OnlyKey hardware authentication, TOTP, and encrypted database sharing via KeeShare.
What You Get
- KDBX Database Format Support - Fully supports KDBX3 and KDBX4 formats, ensuring compatibility with KeePass and enabling advanced encryption options like Twofish and ChaCha20.
- Browser Integration - Auto-fills passwords and supports passkeys in Chrome, Firefox, Edge, Chromium, Vivaldi, Brave, and Tor Browser via native browser extensions.
- YubiKey/OnlyKey Challenge-Response - Uses hardware security keys for database unlocking and authentication, enhancing security beyond master passwords.
- TOTP Storage and Generation - Built-in time-based one-time password generator and storage for 2FA codes directly within entries.
- Password Generator with Custom Rules - Creates complex passwords or memorable passphrases with customizable length, character sets, and patterns.
- Entry History and Data Restoration - Tracks changes to entries and allows restoring previous versions to recover accidentally deleted or modified data.
- KeeShare Synchronization - Securely share and synchronize databases across devices using encrypted peer-to-peer sharing without cloud storage.
- Command Line Interface (keepassxc-cli) - Automate password management tasks, export data, or integrate with scripts using a full-featured CLI tool.
- FreeDesktop.org Secret Service Integration - Replaces GNOME Keyring and other system keychains, allowing other apps to securely retrieve passwords via D-Bus.
- Import from Multiple Formats - Imports databases from CSV, 1Password, Bitwarden, Proton Pass, and KeePass1, enabling seamless migration.
- Database Security Reports - Analyzes password health, checks for breaches via HIBP (Have I Been Pwned), and generates usage statistics.
- File Attachments and Custom Attributes - Store encrypted files (e.g., PDFs, keys) and add custom fields to entries for flexible data organization.
Common Use Cases
- Managing hundreds of unique passwords for work and personal accounts - A sysadmin uses KeePassXC to store and auto-fill credentials across servers, SaaS tools, and internal systems with TOTP and browser integration.
- Securing access with hardware keys for high-risk accounts - A journalist uses YubiKey with KeePassXC to unlock their password database, ensuring physical presence is required for access.
- Syncing passwords across Windows, macOS, and Linux machines - A developer uses KeeShare to securely synchronize their encrypted database between work and home computers without cloud services.
- Migrating from 1Password or Bitwarden to a self-hosted solution - A privacy-focused user imports their existing vaults via CSV or native importers and moves all data to an offline KDBX database.
Under The Hood
Architecture
- Clear separation of concerns through modular directories isolating data models, cryptographic primitives, and format parsers with no GUI dependencies
- Layered architecture enforces unidirectional dependencies, allowing GUI components to consume core logic while enabling headless operations
- Dependency injection via factory patterns and singleton accessors avoids global state, with configuration centralized through a dedicated Config class
- Compile-time feature flags enable plugin-like extensibility for features like YubiKey and passkeys without bloating the core
- Composite key system supports multi-factor authentication at the core layer, with polymorphic interfaces allowing dynamic GUI adaptation
- Qt-based UI components are decoupled from data logic using signal-slot mechanisms and smart pointers, supporting complex workflows like cross-database exports
Tech Stack
- C++ codebase built on Qt5 with deep integration of its GUI and declarative modules for native cross-platform desktop experience
- Dependency management via vcpkg ensures consistent cryptographic library versions including Botan, Argon2, and libqrencode
- CMake build system automates third-party resolution and platform-specific configurations across Linux and FreeBSD
- Local file-based storage with custom encryption layers replaces traditional databases, prioritizing security and portability
- Minimal external infrastructure reliance, with deployment focused on native binaries and platform-native UI components
Code Quality
- Extensive test suite using QtTest with comprehensive coverage of core operations, leveraging temporary files and signal spies to validate state transitions
- Modular organization with consistent use of QSharedPointer and const-correctness ensures safe resource management and memory integrity
- Robust error handling through nullable output parameters and explicit validation, avoiding exceptions while maintaining recoverable failure states
- Strong type safety enforced via strongly-typed enums, Q_DECLARE_TYPEINFO, and careful pointer usage to prevent common C++ pitfalls
- Comprehensive linting and build-time validation through feature flags and structured source grouping ensure consistent quality across modules
- Naming conventions follow Qt idioms with descriptive camelCase identifiers and clear prefixes for tests and platform-specific code
What Makes It Unique
- Native implementation of the freedesktop.org Secret Storage API enables seamless desktop integration without background daemons
- Bidirectional interoperability with multiple password formats (KDBX, KDB, Bitwarden, 1Password, ProtonPass) sets a new standard for ecosystem compatibility
- Pluggable cryptographic KDFs and custom stream processors allow enterprise-grade extensibility without compromising performance
- Browser extension integration with passkey support operates at the system level with memory-safe credential handling
- Block-level file monitoring detects external database changes without full re-reads, reducing attack surface
- Dynamic tag system with non-modal editing provides an innovative, clutter-free approach to credential organization