Keychain by Rhim

Take complete control of your login credentials with a lightning-fast, local-first password manager that never sends your passwords to the cloud.

Keychain is a privacy-first browser extension designed to store credentials locally and autofill login forms securely.

KEY FEATURES

• Instant Form Autofill: Automatically detects username and password fields on any website and fills them in a single click.
• Master Password Security: Encrypts your entire credential vault locally using strong cryptography derived directly from your master password.
• Custom Field Builder: Store more than just logins—add custom fields like PINs, secret keys, recovery codes, and security answers to any entry.
• Encrypted Import & Export: Effortlessly back up and restore your credential vault using password-protected JSON backup files.
• Smart Field Detection: Customize detection keywords so Keychain accurately matches username and password inputs on any unique site layout.
• 100% Private & Client-Side: All app data stays strictly inside your browser storage. No data is ever transmitted to external servers.

HOW TO USE KEYCHAIN

1. Create Master Password: Set up your primary master password when opening Keychain for the first time.
2. Save Logins: Add your accounts, web addresses, passwords, and custom fields to your vault.
3. Navigate & Autofill: Visit any login page and select your saved account from the inline dropdown or popup.
4. Lock & Protect: Click Lock anytime to secure your vault, requiring your master password to unlock again.

ZERO-CLOUD LOCAL SECURITY ARCHITECTURE

• Zero Third-Party Servers: Your vault exists exclusively inside your browser's local storage. There are no remote databases to hack.
• Master Key Derived Protection: Passwords are decrypted in-memory only when unlocked and cleared immediately upon locking.
• Complete Offline Capability: Works 100% offline without requiring internet access or account creation.

🔒 SIMPLE SECURITY & PRIVACY GUARANTEE

• Your Data Never Leaves Your Computer: Keychain runs 100% inside your browser. All data processing and storage happen directly on your own computer.
• No Cloud Uploads & No Account Needed: We do not save your files to the internet, and we do not track what websites you visit or what you type.
• Local Security Encryption: All sensitive operations occur locally on your machine storage before saving.
• Digitally Signed & Verified by Mozilla: Scanned for security issues and digitally signed in accordance with official Mozilla Add-on Signing & Verification Standards.