Markdown ⇄ HTML Online Converter | Bidirectional Conversion Tool
Free online tool to convert Markdown to HTML instantly. Supports tables, lists, and code blocks. Bidirectional: HTML → Markdown reverse conversion also available.
How to Use
Enter your Markdown text in the left textarea and click the “Convert »” button to see the converted HTML on the right.
Use the “« Convert” button for reverse conversion: HTML → Markdown.
💡 基本のHow to Use
- Paste your Markdown into the left textarea
- Configure options as needed
- Click “Convert »” → HTML is output on the right & auto-copied to clipboard
⚙️ Key Options
| Option | Description & When to Use |
|---|---|
| Convert Markdown → HTML | Automatically converts headings (#), lists (-/*), links, tables, and code blocks to HTML. Leave ON for standard use. |
| Fix AI-generated writing style | Smooths out repetitive patterns and unnatural connectors common in AI-generated text. Great for polishing AI-drafted blog posts. |
| Convert line breaks inside <p> → <br /> | Preserves line breaks within paragraphs as <br /> tags. Turn ON if line breaks disappear when pasting into the WordPress block editor. |
| | → <table> tag conversion + Cell merging | Converts pipe (|) separated Markdown tables to HTML. Use </> for horizontal merge and ^ for vertical merge. |
| Wrap <img /> with <picture> | When converting Markdown images (), wraps the resulting img tag with a picture element. Useful for responsive themes. |
| Auto-add class attributes to tags (a / b / s / h2–h6, etc.) | Automatically adds your theme’s class names to converted tags. For example, add link to a tags or bold to b tags — customize to match your theme. |
| Set list-style-type for <ul> / <ol> | Choose a list style from the dropdown. Supports theme-specific types such as bullet, check, and diamond. |
🎯 Use Cases
| Scenario | How to Use |
|---|---|
| WordPress Publishing | Convert a Markdown-written article to HTML and paste it into the WordPress block editor’s “Custom HTML” block. Auto class assignment preserves all styling. |
| Cleaning Up AI-Generated Content | Convert Markdown output from ChatGPT / Claude to HTML while simultaneously using the AI writing fix option to produce natural-sounding prose. |
| GitHub README → Web Page | Paste your README Markdown directly and convert to HTML. Code blocks and tables are converted as-is. |
| HTML → Markdown Reverse Conversion | To convert existing HTML back to Markdown, use the “« Convert” button. Paste HTML into the right textarea and convert. |
📋 About Advanced Options
The “Advanced Options” section contains more granular controls: special character conversion, detailed line break handling, batch text replacement, and more.
For most use cases, the basic options are sufficient. Advanced options are there for edge cases, conflict testing, or specialized format conversions.
