Headings
One # per level. Use one H1 per document.
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# Heading 1 ## Heading 2 ### Heading 3 #### Heading 4
CommonMark
UniversalThe standardised baseline. Works in every markdown processor and is the foundation every other flavor builds on.
Bold & italic
Wrap text in asterisks. Combine for both.
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*italic* and _italic_ **bold** and __bold__ ***both*** and ___both___
italic and italic
bold and bold
both and both
Links
Inline links use square brackets and parentheses.
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[Markdown Writer](https://markdownwriter.com) [with title](https://example.com "tooltip")
Images
Same as links, with a leading exclamation mark.
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image.png
Lists
Hyphens or asterisks for bullets. Numbers for ordered.
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- First - Second - Nested - Nested 1. One 2. Two
- First
- Second
- Nested
- Nested
- One
- Two
Blockquote
Prefix lines with a greater-than sign.
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> The clouds were doing > that thing where they > look painted on.
The clouds were doing that thing where they look painted on.
Inline code
Wrap with single backticks.
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Run `pnpm install` to get started.
Run pnpm install to get started.
Fenced code blocks
Triple backticks. Optional language hint after the opener.
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``` plain code no highlighting ```
plain code no highlighting
Horizontal rule
Three or more hyphens, asterisks, or underscores on a line.
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Above the line. --- Below the line.
Above the line.
Below the line.
GitHub Flavored
GFMGitHub's superset. Markdown Writer supports the full GFM spec — tables, task lists, footnotes, autolinks, strikethrough.
Tables
Pipe-separated columns. The dash row sets alignment with optional colons.
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| Feature | Status | Notes | | ------------ | :----: | -----------: | | Tables | ✓ | GFM | | Task lists | ✓ | GFM | | Math | ✓ | KaTeX |
| Feature | Status | Notes |
|---|---|---|
| Tables | ✓ | GFM |
| Task lists | ✓ | GFM |
| Math | ✓ | KaTeX |
Task lists
Bullets with bracketed checkboxes. Use x for checked.
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- [x] Ship cheatsheet page - [x] Add FAQ schema - [ ] Submit to Product Hunt - [ ] Land on page one
- Ship cheatsheet page
- Add FAQ schema
- Submit to Product Hunt
- Land on page one
Strikethrough
Wrap with two tildes.
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~~deprecated~~ replaced by the new API.
deprecated replaced by the new API.
Autolinks
GFM auto-detects bare URLs and email addresses.
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Visit https://markdownwriter.com or email hello@markdownwriter.com.
Visit https://markdownwriter.com or email hello@markdownwriter.com.
Highlighted code
Add a language hint after the opening fence.
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```ts
const greet = (name: string) => `Hello, ${name}!`;
```const greet = (name: string) => `Hello, ${name}!`;Footnotes
Reference with [^id] in text and define elsewhere.
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Markdown is portable[^1]. [^1]: Same source, every renderer.
Extended
Markdown WriterExtras Markdown Writer adds on top of GFM. Math, diagrams, and GitHub-style alert callouts — all rendered in the live preview.
Alert callouts
GitHub-style admonitions. Five types, all colour-coded.
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> [!NOTE] > Useful information users should know. > [!TIP] > Helpful advice for doing things better. > [!WARNING] > Critical content demanding immediate user attention.
Note
Useful information users should know.
Tip
Helpful advice for doing things better.
Warning
Critical content demanding immediate user attention.
Inline math
Wrap LaTeX in single dollar signs. Rendered with KaTeX.
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Einstein's $E = mc^2$ holds in every frame.
Einstein's E = mc2 holds in every frame.
Block math
Double dollar signs surround a centered display equation.
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$$
\int_0^\infty x^2 e^{-x} \,dx = 2
$$∫0∞∞ x2 e-x dx = 2
Mermaid diagrams
Use a mermaid-tagged code fence. Renders as SVG.
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```mermaid graph LR A[Write] --> B[Preview] B --> C[Export] ```
WritePreviewExport