Note Lock

Password-protect individual notes in your Obsidian vault. Unlike folder-level protection plugins, Note Lock lets you lock specific files — right-click any markdown file to protect it.

Features

• Per-file protection — Right-click any markdown file to lock/unlock it. Only protected files require password verification.
• Password security — Passwords are stored as SHA-256 hashes using the Web Crypto API. No plaintext is ever saved.
• Idle auto-lock — Configurable timeout (in minutes) that automatically re-locks files after inactivity. Each file has its own independent timer.
• Auto-lock on file switch — Optionally re-lock the previous file when you navigate to a different note.
• Tab close detection — Closing a tab automatically revokes access to that file.
• Cross-platform — Works on both desktop and mobile using only Obsidian API and Web standard APIs.

How to use

1. Open Settings → Note Protection and set your password.
2. Right-click any markdown file → Encrypt to protect it.
3. Opening a protected file will prompt for your password.
4. To permanently remove protection, right-click → Decrypt and enter your password.

Settings

Setting	Description
Password	Set or change your global password
Idle auto-lock	Minutes of inactivity before files are re-locked (0 to disable)
Auto-encrypt on close	Re-lock the previous file when switching to another note

Supported file types

Currently only Markdown (.md) files are supported. Canvas, Excalidraw, and other non-markdown file types are not supported because protection status is stored in frontmatter, which is only available in markdown files.

How it works

• Protection status is stored in each file's frontmatter (protected: 'encrypted').
• Access is tracked in memory per session — restarting Obsidian requires re-verification.
• The plugin does not encrypt file contents. It prevents access through Obsidian's UI. Files remain readable via the filesystem.

Development

npm install
npm run build

To run tests:

npm run test