Question 1

Is the Mermaid viewer free?

Accepted Answer

Yes—100% free. No signup, no subscription, no usage limits, and no hidden fees. Preview, zoom, and PNG export are all included at no cost.

Question 2

Is my diagram uploaded anywhere?

Accepted Answer

No. Parsing and rendering run entirely in your browser. Photos Quick never receives, stores, or processes your diagram source on a server.

Question 3

How do I export a PNG?

Accepted Answer

Fix any syntax errors until the badge shows Valid, then use Copy PNG or Download PNG beside the Preview title. Export uses the full diagram at native size with your chosen light or dark theme.

Question 4

Why does Copy PNG not work?

Accepted Answer

Copy PNG requires HTTPS, a recent browser, and clipboard permission for images. If copy fails, use Download PNG instead.

Question 5

What diagram types does Mermaid support?

Accepted Answer

Flowcharts, sequence diagrams, class diagrams, state diagrams, ER diagrams, Gantt charts, pie charts, and other syntax supported by the bundled Mermaid version.

Question 6

Does zoom affect the exported PNG?

Accepted Answer

No. Zoom and pan are for viewing only. PNG export always includes the full diagram, matching the light or dark theme background.

Question 7

Why does my diagram look wrong?

Accepted Answer

Check the syntax badge and error message for parse issues. Common causes include typos, unsupported directives, or features not available in the current Mermaid version.

Render Mermaid diagrams in your browser

Frequently asked questions