Markdown Visualizer
render · preview · mermaid · diagrams
$ how-to-use
Paste or type your markdown in the editor. The preview updates in real-time. Click Format to auto-fix common issues like heading spacing, list consistency, and table alignment. Supports standard markdown syntax plus Mermaid diagrams.
What This Tool Does
Markdown is everywhere in development — README files, documentation, issue templates, pull request descriptions. This visualizer renders markdown exactly like GitHub, GitLab, and other platforms, so you can preview how your documentation will look before publishing.
The Mermaid integration lets you create flowcharts, sequence diagrams, Gantt charts, and more using simple text syntax. Perfect for documenting system architecture, API workflows, or project timelines directly in your markdown files.
Everything runs in your browser — upload sensitive documentation files, preview internal wikis, or test markdown syntax without sending data to external servers.
Features
Live Preview
Real-time rendering as you type. See exactly how your markdown will appear on GitHub, GitLab, or documentation sites.
Mermaid Diagrams
Create flowcharts, sequence diagrams, Gantt charts, and more using Mermaid syntax. Perfect for technical documentation.
Full Markdown Support
Headers, lists, links, images, code blocks, tables, task lists, and GitHub-style markdown extensions.
Auto-Format
Automatically fix common formatting issues — heading spacing, list consistency, table alignment, and more.
100% Client-Side
Everything runs in your browser. Your documentation and code snippets never leave your device.
Mermaid Diagram Examples
Flowchart
```mermaid
flowchart TD
A[Start] --> B{Is it working?}
B -->|Yes| C[Great!]
B -->|No| D[Fix it]
D --> B
```Sequence Diagram
```mermaid
sequenceDiagram
participant User
participant API
participant DB
User->>API: Request data
API->>DB: Query database
DB-->>API: Return results
API-->>User: Send response
```FAQ
Can I upload markdown files?
Yes! Use the file upload button to load .md files directly. The content will appear in the editor for preview and editing.
What Mermaid diagrams are supported?
Flowcharts, sequence diagrams, class diagrams, state diagrams, Gantt charts, pie charts, and more. Full Mermaid syntax is supported.
Does it match GitHub rendering?
Yes! The rendering closely matches GitHub's markdown parser, including support for task lists, tables, and syntax highlighting for code blocks.
What formatting issues does it fix?
Adds blank lines around headings, standardizes list bullets, aligns table columns, removes trailing whitespace, fixes link formatting, and ensures consistent code block spacing.