Privacy Policy

Last updated: January 2026

This Privacy Policy describes how we handle information when you use the Mermaid Viewer application. We keep data collection lean and focused on improving the product experience.

Information We Collect

  • Product usage signals

    Event data such as feature clicks, rendering errors, and session timings to understand reliability and performance.

  • Content you provide

    Diagrams, prompts, or configuration you intentionally submit while using the app.

  • Device and technical metadata

    Browser type, operating system, and non-identifying diagnostic information used to support compatibility and debugging.

How We Use Information

We process information to operate, maintain, and improve Mermaid Viewer, including stability, performance, and user experience enhancements.

We do not sell personal information, and we do not use collected data for advertising or cross-site tracking.

Data Retention

Usage and diagnostic data are retained only for as long as needed to analyze product performance and fulfill the purposes described here. User-provided content may be stored locally in your browser or persisted in your account if you choose to save it.

Security

We apply industry-standard security controls to protect information in transit and at rest. No method of transmission or storage is completely secure, and we encourage you to avoid sharing sensitive personal data in diagrams or prompts.

Third-Party Services

We may rely on trusted vendors for hosting, analytics, or AI processing. These providers are contractually required to safeguard data and use it only to deliver the services we request.

Your Choices

  • You can clear local data and saved diagrams at any time from the app settings.
  • You may opt out of non-essential analytics where provided.
  • You can request clarification about how we handle data by contacting us.

Children's Privacy

Mermaid Viewer is not directed to children under 13. We do not knowingly collect personal information from children. If you believe a child has provided us with personal data, please contact us so we can take appropriate action.

Changes to This Policy

We may update this Privacy Policy to reflect improvements or legal requirements. We will revise the "Last updated" date when changes are made.


Contact

Questions or requests about this Privacy Policy can be sent to our support team. We respond to good-faith inquiries in a reasonable time.