Privacy Policy

Last Updated: November 8, 2025

Overview

Markdown Viewer ("the Extension") respects and protects user privacy. This privacy policy explains how the Extension handles user information.

Data Collection

The Extension does NOT collect, store, or transmit any personal user data.

Specifically, the Extension:

• ❌ Does NOT collect personal identification information
• ❌ Does NOT collect health information
• ❌ Does NOT collect financial and payment information
• ❌ Does NOT collect authentication information
• ❌ Does NOT collect personal communications
• ❌ Does NOT collect location information
• ❌ Does NOT collect web browsing history
• ❌ Does NOT collect user activity data
• ❌ Does NOT collect website content

Local Data Storage

The Extension uses browser's local storage (Chrome Storage API) to save the following information only on your device, which is never uploaded to any server:

1. Rendering Cache: PNG images converted from Mermaid diagrams and complex HTML/SVG content, used to improve loading speed when reopening documents
2. User Settings:
3. Document reading position (scroll position)
4. Zoom level settings
5. Page layout preferences

This data is stored completely locally and can be deleted at any time by clearing browser cache.

Permissions Usage

The Extension requests the following permissions solely for core functionality:

storage & unlimitedStorage

Used to cache rendered images and user settings locally, no data uploading involved.

offscreen

Used to render Markdown content in the background, including converting Mermaid diagrams to PNG images, all processing done locally.

scripting

Used to inject rendering scripts when opening Markdown files, converting Markdown to formatted HTML display.

tabs

Used to detect if the current tab has opened a Markdown file, and to get document title for export file naming.

downloads

Used to export Markdown documents to Word (.docx) format and save locally.

Host Permissions (file://, http://, https://)

Used to access local Markdown files and online Markdown files (such as documents on GitHub, GitLab platforms).

Data Sharing

The Extension does NOT share user data with any third parties.

The Extension:
- ✅ Runs completely locally
- ✅ Contains no analytics or tracking code
- ✅ Uses no remote servers
- ✅ Sends no data to any third parties

Data Security

Since the Extension does not collect or transmit any user data, there is no risk of data breach. All processing operations are completed locally on the user's device.

User Rights

Users can at any time:
- Clear the Extension's local cache through browser settings
- Uninstall the Extension to remove all local storage data
- Manage permissions in extension settings

Children's Privacy

The Extension is not directed to children under 13 and does not knowingly collect personal information from children.

Policy Changes

If there are any changes to this privacy policy, we will update this page and modify the "Last Updated" date. Users are encouraged to review this policy regularly.

Contact

For any questions about this privacy policy, please contact:

• GitHub Issues: https://github.com/xicilion/markdown-viewer-extension/issues
• Email: xicilion@gmail.com