How to use Markdown preview
- 1. Paste Markdown. Or drop a .md file.
- 2. Read the TOC. From h1–h6.
- 3. Preview HTML. Same engine as HTML ↔ Markdown.
- 4. No mermaid. Diagrams stay as code fences.
About this tool
README review is faster with a preview and a TOC. This tool runs the same Markdown pipeline as HTML ↔ Markdown and lists headings with slug ids.
GitHub vs CommonMark
marked is close to GFM for tables and fences; exact GitHub rendering can differ.
Mermaid / KaTeX
Not executed. Use a later diagram tool.
Code examples
MD
# Title
Hello **world**.