Browser extension

Capture the page you’re on as clean Markdown — then save it straight into your Locker. Works in Chrome and Brave. Pairs with the Mac app for silent saves.

Install from the Chrome Web Store →

Why a browser extension?

Research, articles, and docs live in the browser. The extension is Capture for the web: one click, a smart extract, and a real .md file in the same folder the Mac app uses. No copy-paste dance. No cloud middleman.

Modes

Article — main story only. Nav, ads, and sidebars stripped. Best default for news and blogs.
Selection — highlight text on the page first, then open the extension. Saves just that passage.
Full Page — everything. Useful when Article misses a layout you care about.

Each note gets a smart filename you can edit, plus frontmatter (title, source URL, capture time, mode). A scrollable preview shows the Markdown before you save.

Install

Get it from the Chrome Web Store — one listing covers Chrome and Brave:

chromewebstore.google.com/detail/markdown-locker

Open the listing and choose Add to Chrome (or Add to Brave)
Pin the toolbar icon
Optional: install the Mac app so “Add to Locker” writes straight into your Locker folder

How it works with the Mac app

The extension and the desktop app share one Locker folder on disk.

App installed + host registered — “Add to Locker” writes silently into ~/Documents/Markdown Locker (or ~/Markdown Locker if that folder already exists). Notes appear in Explore immediately.
App not installed — the extension still works. Notes save to Downloads/Markdown Locker/. Status tells you to install the app for direct Locker saves.

The bridge is a small native messaging host. If silent saves don’t work after installing the app, register the host once, then fully quit the browser and reload the extension:

./extension/native-host/register-host.sh

Developers

To load an unpacked build from the repo:

Clone markdown-locker
Open Chrome or Brave → Extensions → enable Developer mode
Load unpacked → select the extension/ folder

Privacy

Extraction runs on your machine. Page content is not uploaded to Markdown Locker servers. The native host only writes local .md files. See Privacy.

Same Locker. Browser captures, Smart Paste, From URL, and typed notes all land as plain markdown in one folder — ready for Explore, Think, Workspace, and agents via MCP.