How to View Mermaid Diagrams on Android

Mermaid is a JavaScript-based diagramming language that lets you create flowcharts, sequence diagrams, Gantt charts, and more — all from simple text syntax inside Markdown files. But viewing these diagrams on an Android phone has traditionally been a challenge. Most Markdown apps simply display the raw mermaid code block as plain text.

In this guide, you’ll learn how to render and view Mermaid diagrams on Android using MerMD — a free Markdown viewer that supports native Mermaid rendering.

Why Can’t Most Android Apps Render Mermaid?

Mermaid diagrams require a JavaScript rendering engine to parse the text syntax and convert it into SVG graphics. Most Android Markdown editors treat ```mermaid blocks as regular code, displaying the raw syntax instead of the visual diagram. This is because:

• Mermaid.js is a browser library — it needs a WebView or browser engine to execute
• Most Markdown apps focus on editing, not rendering quality
• Integrating Mermaid adds complexity and requires careful offline support

MerMD solves this by embedding a Mermaid rendering engine that works entirely offline — no server requests, no internet required.

Step 1: Install MerMD

Download MerMD for free from the Google Play Store. It’s a lightweight app (under 15 MB) that installs in seconds. No account required — just open and start reading.

Step 2: Open a Markdown File with Mermaid

You can open Markdown files from multiple sources:

• Local storage — browse your device’s file system for .md files
• GitHub — connect your account and browse repositories directly
• Google Drive — access Markdown files stored in Drive
• GitLab, OneDrive, Dropbox — all supported with built-in integration

Any Markdown file containing a ```mermaid code block will be automatically detected and rendered.

Step 3: View Your Diagrams

MerMD renders all major Mermaid diagram types natively:

Flowcharts

Visualize processes, decision trees, and workflows. Flowcharts are the most common Mermaid diagram type, perfect for documenting business logic and system architecture.

graph TD
    A[Start] --> B{Decision}
    B -->|Yes| C[Action 1]
    B -->|No| D[Action 2]
    C --> E[End]
    D --> E

Sequence Diagrams

Model API calls, microservice interactions, and communication patterns between system components.

sequenceDiagram
    Client->>+Server: HTTP Request
    Server->>+Database: Query
    Database-->>-Server: Results
    Server-->>-Client: JSON Response

Gantt Charts

Project timelines, sprint planning, and task scheduling — all rendered from simple Mermaid syntax in your Markdown project documentation.

ER Diagrams

Database schema visualization with entity-relationship diagrams. Perfect for reviewing data models in your repository documentation.

Class Diagrams, Pie Charts, State Diagrams

MerMD supports the full range of Mermaid diagram types including UML class hierarchies, statistical pie charts, and state machine diagrams.

Why MerMD is the Best Option for Mermaid on Android

• 100% offline — diagrams render on-device with no internet needed
• Free — no subscriptions, no in-app purchases
• Fast rendering — diagrams appear instantly as you scroll
• Cloud integration — view diagrams from GitHub, Google Drive, GitLab, OneDrive, and Dropbox
• Dark & light themes — diagrams adapt to your preferred reading theme
• Export support — save rendered documents as PDF, HTML, or images

Conclusion

Viewing Mermaid diagrams on Android doesn’t have to be frustrating. With MerMD, you get native, offline Mermaid rendering inside a beautiful Markdown viewer — with cloud storage integration so you can access diagrams from GitHub, Google Drive, and more. Download it free from Google Play and start rendering diagrams today.