This Chrome extension renders Markdown (.md) files displayed in Google Drive's preview pane as formatted HTML. This page explains exactly what the extension does and does not do with your data.
None that leaves your computer.
The extension stores two user preferences locally using Chrome's chrome.storage.sync API:
These preferences are managed by Chrome itself and may sync between your own signed-in Chrome instances if you have Chrome sync enabled. They are not transmitted to the extension's developer, to any third party, or to any external server.
The extension reads the contents of .md files you preview in Google Drive in order to convert them to HTML in the browser. This reading happens entirely within your browser. The file contents are not transmitted anywhere. They are converted to HTML by a local Markdown library (marked.js) and sanitized by a local HTML sanitizer (DOMPurify) before being inserted into the page.
The extension makes no network requests of any kind. It does not contact the developer's servers, analytics services, error reporting services, update servers (beyond Chrome's own extension update mechanism), or any other remote endpoint. You can verify this by inspecting the source code.
storage — to save your enabled/disabled and theme preferences locally.activeTab — so the popup can interact with the current Google Drive tab when you click the extension's toolbar icon.webNavigation — to detect navigation within Drive's single-page app, so the extension knows when you've opened a new .md file. Used only on the matched hosts below.https://drive.google.com/* and https://studio.workspace.google.com/* — the only hosts where the extension runs. The extension is not active on any other website.The extension uses no third-party services. Two open-source libraries (marked.js and DOMPurify) are bundled directly into the extension and run locally in your browser. They make no network requests either.
The extension does not collect data, so there is nothing to share, sell, or transfer. The developer does not have access to any information about you, your Drive contents, or your use of the extension.
The extension does not knowingly collect any data from anyone, including children.
If this policy ever changes, the updated version will be posted at this URL and the "last updated" date above will change. The extension itself does not need a privacy policy update for code changes that don't affect data handling — and as long as the extension's behavior matches the description above, no such changes are anticipated.
Source code, issues, and contributions: github.com/cfrazier/google-drive-markdown-preview