HTML, CSS, and JavaScript with Bootstrap 5 for layout and styling.
Marked, DOMPurify, Highlight.js, Mermaid, MathJax, and Emoji Toolkit for rendering.
Open-source credits
Markdown Viewer is built on top of open-source libraries maintained by the community. Thank you to every contributor and maintainer.
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---
title: Welcome to Markdown Viewer
description: A GitHub-style Markdown renderer with live preview, math, diagrams, and export support.
author: ThisIs-Developer
tags: ["markdown", "preview", "mermaid", "latex", "open-source"]
---
# Welcome to Markdown Viewer
## ✨ Key Features
- **Live Preview** with GitHub styling
- **Smart Import/Export** (MD, HTML, PDF)
- **Mermaid Diagrams** for visual documentation
- **LaTeX Math Support** for scientific notation
- **Emoji Support** 😄 👍 🎉
## 💻 Code with Syntax Highlighting
```javascript
function renderMarkdown() {
const markdown = markdownEditor.value;
const html = marked.parse(markdown);
const sanitizedHtml = DOMPurify.sanitize(html);
markdownPreview.innerHTML = sanitizedHtml;
// Syntax highlighting is handled automatically
// during the parsing phase by the marked renderer.
// Themes are applied instantly via CSS variables.
}
```
## 🧮 Mathematical Expressions
Write complex formulas with LaTeX syntax:
Inline equation: $$E = mc^2$$
Display equations:
$$\frac{\partial f}{\partial x} = \lim_{h \to 0} \frac{f(x+h) - f(x)}{h}$$
$$\sum_{i=1}^{n} i^2 = \frac{n(n+1)(2n+1)}{6}$$
## 📊 Mermaid Diagrams
Create powerful visualizations directly in markdown:
```mermaid
flowchart LR
A[Start] --> B{Is it working?}
B -->|Yes| C[Great!]
B -->|No| D[Debug]
C --> E[Deploy]
D --> B
```
### Sequence Diagram Example
```mermaid
sequenceDiagram
User->>Editor: Type markdown
Editor->>Preview: Render content
User->>Editor: Make changes
Editor->>Preview: Update rendering
User->>Export: Save as PDF
```
## 📋 Task Management
- [x] Create responsive layout
- [x] Implement live preview with GitHub styling
- [x] Add syntax highlighting for code blocks
- [x] Support math expressions with LaTeX
- [x] Enable mermaid diagrams
## 🆚 Feature Comparison
| Feature | Markdown Viewer (Ours) | Other Markdown Editors |
|:-------------------------|:----------------------:|:-----------------------:|
| Live Preview | ✅ GitHub-Styled | ✅ |
| Sync Scrolling | ✅ Two-way | 🔄 Partial/None |
| Mermaid Support | ✅ | ❌/Limited |
| LaTeX Math Rendering | ✅ | ❌/Limited |
### 📝 Multi-row Headers Support
Document Type
Support
Markdown Viewer (Ours)
Other Markdown Editors
Technical Docs
Full + Diagrams
Limited/Basic
Research Notes
Full + Math
Partial
Developer Guides
Full + Export Options
Basic
## 📝 Text Formatting Examples
### Text Formatting
Text can be formatted in various ways for ~~strikethrough~~, **bold**, *italic*, or ***bold italic***.
For highlighting important information, use highlighted text or add underlines where appropriate.
### Superscript and Subscript
Chemical formulas: H2O, CO2
Mathematical notation: x2, eiπ
### Keyboard Keys
Press Ctrl + B for bold text.
### Abbreviations
GUI
API
### Text Alignment
Centered text for headings or important notices
Right-aligned text (for dates, signatures, etc.)
### **Lists**
Create bullet points:
* Item 1
* Item 2
* Nested item
* Nested further
### **Links and Images**
Add a [link](https://github.com/ThisIs-Developer/Markdown-Viewer) to important resources.
Embed an image:
### **Blockquotes**
Quote someone famous:
> "The best way to predict the future is to invent it." - Alan Kay
---
## 🛡️ Security Note
This is a fully client-side application. Your content never leaves your browser and stays secure on your device.