Privacy Policy

Mermaid diagram rendering and PNG, SVG, JPG, WebP, and PDF export happen in your browser. Your Mermaid source code and exported diagram files are not sent to our application servers for the core export workflow.

If you use a URL fragment such as #code=..., the fragment is not sent to our servers as part of the HTTP request. We also do not intentionally send URL fragments, editor content, or exported diagrams to analytics providers.

Please do not paste secrets, API keys, passwords, production credentials, or highly confidential information into any public website, including this one.

We use privacy-focused analytics and performance measurement tools, including Plausible Analytics served from plausible.shipsolo.io, Google Analytics 4, Ahrefs Web Analytics, and Cloudflare services, to understand how visitors use Mermaid Online and to improve the product.

These analytics may collect information such as:

• pages visited, such as /mermaid-to-png;
• browser, device type, approximate region, referrer, and campaign parameters;
• page load performance and basic reliability signals;
• anonymous product events, such as export format clicks or rendering error categories.

We do not use analytics to collect, read, upload, store, or share your Mermaid diagram code, editor text, URL fragment content, or exported diagram images. Product events should describe what happened, such as export_png_clickor render_failed, without including the original diagram source.

Mermaid Online is served through Cloudflare Workers, Cloudflare DNS, CDN, and related security and performance services. Cloudflare may process routine request and performance data on our behalf, such as IP address, user agent, timestamps, requested path, security events, and performance measurements.

Cloudflare Web Analytics or similar Cloudflare measurement tools may be used to measure traffic and performance. These tools are not intended to collect Mermaid diagram code, editor content, URL fragments, or exported diagrams.

If you email us, we may receive your email address, message content, and any information you choose to include. Please avoid sending sensitive Mermaid source code, credentials, or private infrastructure details unless you intentionally want us to review that information for support.

• We do not upload or store your Mermaid diagram code for the core export workflow.
• We do not use your Mermaid diagram code to train AI models.
• We do not sell your Mermaid diagram code or exported diagrams.
• We do not intentionally send editor content, URL fragments, or exported images to analytics providers.

We may update this policy when we add or change analytics, hosting, support, or product features. The latest version will be posted on this page.