Privacy Policy

1. Who We Are

This tool is operated by Ranjan Kumar as a free personal project. The service is available at mermaid.ranjankumar.in.

2. Information We Do Not Collect

We do not collect, store, or process:

• Any diagram or Mermaid code you create or edit
• Files saved through the File Manager
• Your name, email address, or any personal identifiers
• Account or login credentials (there is no account system)

All diagram content lives exclusively in your browser's localStorage and sessionStorage. It is never transmitted over the network.

3. Analytics

We use Google Analytics (GA4) with the measurement ID G-M0GCVQRDDS to understand aggregate usage patterns. This may collect:

• Pages visited and time spent
• Browser type and operating system
• Approximate geographic region (country/city)
• Referring website

Google Analytics runs in Google Consent Mode. Until you accept analytics in the cookie banner, it sets no cookies and sends only cookieless measurements. You can change or withdraw your choice at any time from "Cookie settings" in the page footer. This data is aggregated and governed by Google's Privacy Policy. You can opt out using the Google Analytics Opt-out Browser Add-on or a content blocker such as uBlock Origin.

4. Cookies

One strictly necessary cookie, cc_cookie, remembers your cookie choice for 6 months. It is set on .ranjankumar.in, so the same choice applies on ranjankumar.in and its book sites. Only if you accept analytics does Google Analytics set its cookies (_ga and _ga_<id>, which distinguish visitors and sessions and expire after 2 years). Withdrawing consent deletes them. No cookies are used for advertising.

5. Local Storage

The application uses your browser's localStorage and sessionStorage to save your diagram state and named files. This data:

• Never leaves your device
• Can be cleared at any time by clearing your browser's site data
• Is not accessible to us or any third party

6. Third-Party Libraries

The tool loads the Mermaid JavaScript library from cdn.jsdelivr.net. This CDN may log the request (your IP address and browser info) in its access logs, governed by jsDelivr's Privacy Policy. No diagram content is sent to jsDelivr.

7. Children's Privacy

This tool is not directed at children under 13. We do not knowingly collect information from anyone under 13. Because we collect no personal data at all, no special risk exists.

8. Changes to This Policy

We may update this policy as the service evolves. The "Last updated" date at the top of this page will reflect any changes. Continued use of the service after a policy update constitutes acceptance of the revised policy.

9. Contact

If you have questions about this Privacy Policy, please reach out via ranjankumar.in.