MermaidRender.com
MermaidRender.com is a free, interactive live editor for creating and viewing Mermaid.js diagrams. It allows you to quickly write diagram code and preview it in real-time, then export it to various formats including high-DPI print-ready PNG images (up to 700 DPI), SVG vector graphics, and PDF documents.
Select your preferred DPI (e.g., 300 DPI for high quality, or 700 DPI for maximum resolution) and format from the drop-down menu in the top toolbar, then click the Download button. The diagram will be rendered and downloaded directly to your computer.
Yes. MermaidRender.com is a serverless application that runs entirely inside your web browser. Your Mermaid code and rendered diagrams are never uploaded, stored, or processed on any external servers. Everything stays secure on your local machine.
We support the complete official Mermaid.js diagram suite. This includes standard graphs like Flowcharts, Sequence Diagrams, Gantt Charts, Class Diagrams, State Diagrams, Pie Charts, Entity Relationship (ER) Diagrams, and User Journey Maps, as well as advanced models like Mindmaps, Timelines, Sankey Diagrams, Quadrant Charts, GitGraphs, Requirement Diagrams, XY Charts, and Block Diagrams. Select any template from the Templates dropdown to test them instantly.
For high-quality printing (such as in research papers, books, reports, or slides), standard 72 DPI or 96 DPI web exports look blurry and pixelated. MermaidRender resolves this by offering high-resolution renders up to 700 DPI.
1. Export your diagram at 300 DPI or 600 DPI as a PNG image.
2. Insert it into your LaTeX document using \includegraphics[width=\textwidth]{diagram.png}, or insert it into Word. The high pixel density ensures it stays sharp when printed or scaled to PDF.
Mermaid.js lets you generate diagrams using markdown-like plain text. Here are quick syntax templates you can copy and use:
graph TD
A[Start] --> B{Is it private?}
B -- Yes --> C[Render Client-Side]
B -- No --> D[Use Other Tools]
C --> E((Done))sequenceDiagram
Alice->>Bob: Hello Bob, how are you?
alt is sick
Bob->>Alice: Not so good :(
else is well
Bob->>Alice: Feeling great!
endgantt
title A Gantt Diagram
dateFormat YYYY-MM-DD
section Section
A task :a1, 2026-06-01, 30d
Another task :after a1, 20dMost online Mermaid editors process and render diagrams on remote servers or save your charts to their databases. Here is how MermaidRender compares:
Your diagrams, design ideas, flowcharts, and source code never leave your browser. All conversion logic and high-DPI scaling happen entirely inside your local device's memory. This makes it safe for corporate, proprietary, or personal design graphs.
Because there is no backend server API handling your diagrams, the tool is extremely fast, has no upload limits, and doesn't suffer from server downtime or queuing latency.
Unlike the standard editor which exports fixed-width SVG or screenshots, MermaidRender dynamically re-scales coordinates to output true 300+ DPI images for professional publishing workflows.