Markr Privacy Policy

Web Highlighter & Annotator · Chrome Extension

    Markr stores all your data locally on your device using your browser's built-in storage.

    Nothing is transmitted to any server. No account required. Ever.

What data Markr stores

Markr stores the following data exclusively in your browser's local storage (chrome.storage.local):

The text you highlight on web pages
Notes and tags you attach to highlights
Image URLs you attach to annotations
The URL and title of the page where each highlight was made
The XPath anchor used to restore highlights on page reload
Your active highlight color preference

What data Markr does NOT collect

No personal information of any kind
No browsing history beyond the specific pages you annotate
No analytics, telemetry, or crash reporting
No usage statistics
No data is ever transmitted to any server, including ALTRU.dev servers

Payment processing

Markr Pro upgrades are handled by ExtensionPay, an independent payment service. When you upgrade, ExtensionPay processes your payment via Stripe and communicates your paid status back to the extension. ALTRU.dev does not receive or store your payment card details. ExtensionPay's own privacy policy governs data collected during the payment process.

Permissions explained

storage / unlimitedStorage — stores your annotations locally with no size cap, so large annotation collections (research notes, formulas, long passages) are never lost
activeTab — injects the highlighter into the page you are currently viewing, only when you use the extension
tabs / windows — used exclusively to identify which page is active so the annotation panel shows the correct page's highlights; no tab data is stored or transmitted
contextMenus — adds a "Highlight with Markr" option to the right-click menu
sidePanel — displays the annotation panel alongside your browser window

Data portability

Pro users can export all annotations at any time as Markdown, JSON, or CSV. You own your data completely. Uninstalling Markr removes all stored data from your device.

Children's privacy

Markr does not knowingly collect any information from children under 13. The extension collects no personal information from any user regardless of age.

Changes to this policy

If this policy changes materially, the updated version will be posted at this URL. The extension version number in the Chrome Web Store listing will reflect the change.

Contact

Questions about this policy: privacy@altru.dev

Last updated: April 2026 · Markr v1.0.0 · altru.dev