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Headings
# Heading 1— largest heading (H1)## Heading 2— section heading (H2)### Heading 3— sub-section heading (H3)#### Heading 4—##### H5—###### H6
Text Formatting
**bold**or__bold__— bold text*italic*or_italic_— italic text***bold italic***— bold and italic~~strikethrough~~—strikethrough`inline code`—inline code<mark>highlight</mark>— highlighted text<u>underline</u>— underlined textH<sub>2</sub>O— subscript |x<sup>2</sup>— superscript
Lists
- itemor* item— unordered bullet list1. item— ordered numbered list- nested item— indent with 2 spaces to nest- [ ] task— unchecked task list item- [x] done— checked task list item
Links & Images
[link text](https://url.com)— hyperlink[link text](https://url.com "tooltip")— link with tooltip— embed image— image with title<https://url.com>— auto-linked URL
Code Blocks
- Wrap with
```on its own line to open and close a fenced code block - Add a language tag after the opening fence:
```javascript,```python,```css - Syntax highlighting applies automatically for 180+ languages
```mermaid— renders a Mermaid diagram (flowchart, sequence, gantt, pie, etc.)
Tables
- Use
|to separate columns and---in the second row to define headers :---left-align |:---:center |---:right-align- HTML
<table>tags also render and supportcolspanandrowspan
Blockquotes & Rules
> text— blockquote; nest with>>---or***— horizontal rule- End a line with two spaces or
\to force a line break
LaTeX Math
$E = mc^2$— inline math equation$$...$$on its own lines — display (block) equation- Supports all standard LaTeX math commands via MathJax
Frontmatter
- Add YAML frontmatter between
---delimiters at the very top of your file - Fields like
title,description,author, andtagsare rendered as a metadata table
Keyboard Shortcuts
- Ctrl+B — Bold | Ctrl+I — Italic | Ctrl+K — Link
- Ctrl+Z — Undo | Ctrl+Shift+Z — Redo
- Ctrl+F — Find & Replace | Ctrl+T — New Markdown Tab
- Ctrl+S — Save / Export | F11 — Fullscreen
About Markdown
Markdown Viewer
A free online markdown viewer and editor with live preview, LaTeX math, Mermaid diagrams, syntax highlighting, dark mode, and instant PDF/HTML export. No login required.
Version • Free to use • 100% client-side
What is Markdown?
Markdown is a lightweight markup language that lets you write formatted text using plain characters. Created by John Gruber in 2004, it is now the standard format for README files, technical documentation, blog posts, and developer notes. You write in plain text and a markdown viewer converts it into clean, readable HTML with headings, lists, tables, and code blocks.
What is a Markdown Viewer?
A markdown viewer reads your markdown source text and renders it as a formatted document in real time. This markdown viewer runs entirely in your browser. Your content never leaves your computer. There is no server, no account, and no cost. You get a live split-view preview with GitHub-style rendering as soon as you start typing.
What is a Markdown Editor?
A markdown editor is a text editor that understands markdown syntax and shows you a formatted preview alongside your raw text. This markdown editor includes a full toolbar for inserting headings, links, images, tables, code blocks, and math equations without needing to remember the exact syntax. It also supports find and replace, spell check, and multiple document tabs.
Key Features
- Live preview — the rendered output updates instantly as you type
- GitHub-style rendering — your documents look exactly like GitHub README files
- LaTeX math — inline
$...$and display$$...$$equations via MathJax - Mermaid diagrams — flowcharts, sequence diagrams, Gantt charts, and more
- Syntax highlighting — color-coded code blocks for 180+ programming languages
- Export to PDF and HTML — download formatted output with one click
- Dark mode — comfortable low-light theme for night editing
- Multiple tabs — work on several documents at the same time
- Offline capable — works after the first load with no internet connection
- Privacy first — zero data collection, zero server uploads
Technology
- Marked — fast GitHub-flavored markdown parser
- DOMPurify — XSS sanitization for safe rendering
- Highlight.js — syntax highlighting for code blocks
- Mermaid — diagram and chart rendering from text
- MathJax — LaTeX math equation rendering
- Bootstrap 5 — responsive layout and UI components
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