Markdown in 2026 — still the default
Markdown was designed by John Gruber in 2004 to let non-programmers write HTML without thinking about HTML. Twenty years later, it's the universal syntax for developer docs, GitHub READMEs, static sites, Discord/Slack messages, Notion-like tools, and countless other surfaces. Learn it once, use it everywhere.
GitHub-flavored extensions
This tool parses GFM — the de facto standard superset used by GitHub, Reddit, most static site generators, and essentially every modern Markdown renderer:
- Tables — pipe-separated with header row
- Task lists —
- [ ]and- [x] - Strikethrough —
~~text~~ - Fenced code blocks with language hints
- Autolinks — bare URLs render as links
- Line breaks on single newlines (softer than CommonMark)
Cheatsheet
# Heading 1
## Heading 2
**bold**, *italic*, ~~strike~~, `inline code`
- bulleted list
- second item
- nested
1. numbered
2. list
- [x] completed task
- [ ] open task
[link text](https://example.com)
> blockquote
| col1 | col2 |
| --- | --- |
| a | b |
```javascript
const x = 1;
```
---
Horizontal rule above.Security note
This tool does not sanitize HTML in Markdown. Raw HTML tags in your Markdown render as-is,
which is fine for preview but unsafe if you're planning to render untrusted user input. For that,
use DOMPurify or a sandbox.
FAQ
Does this support Math / LaTeX?
Not yet. MathJax / KaTeX integration is on the roadmap.
What about Mermaid diagrams?
Also on the roadmap. Currently Mermaid blocks render as plain code.
Is it private?
Yes. Everything runs client-side via the marked library.
Related tools
- JSON Formatter — Format, validate, and beautify JSON online. 100% client-side — your data never leaves your browser.
- XML Formatter — Format, validate, and beautify XML documents.
- YAML ↔ JSON Converter — Convert between YAML and JSON formats with full fidelity.
- Text Diff — Compare two text blocks line-by-line or word-by-word. Unified and split view. Shows added, removed, and changed segments with full color coding.
Pillar
Part of Data & Format.
Written by Mian Ali Khalid. Last updated 2026-04-25.