# Markdown ↔ HTML Converter

> Convert Markdown to HTML and HTML to Markdown locally in the browser with an optional rendered preview.

## Canonical Routes

- [Tool page](https://markdownhtml.apphelp.net/en): Convert Markdown to HTML and HTML to Markdown locally in the browser with an optional rendered preview.
- [AI discovery](https://markdownhtml.apphelp.net/llms.txt): Markdown profile for LLM retrieval systems.
- [Legacy AI profile](https://markdownhtml.apphelp.net/llm.txt): compact key-value profile.
- [Sitemap](https://markdownhtml.apphelp.net/sitemap.xml): locale URL sitemap.
- [Robots](https://markdownhtml.apphelp.net/robots.txt): crawler policy.

## Tool Contract

- Inputs: A Markdown document or an HTML fragment pasted as text.
- Outputs: Rendered HTML source or Markdown, with an optional in-browser preview.
- Privacy: browser-local processing, no upload by default.
- Languages: en, zh-CN, zh-TW, ar, de, fr.
- SEO: locale-routed, canonical, hreflang, sitemap, robots, JSON-LD.

## Use Cases

- turn Markdown notes into HTML for publishing.
- convert HTML emails or pages back to Markdown.
- preview Markdown rendering quickly.
- clean up pasted HTML into portable Markdown.

## Keywords

- markdown to html
- html to markdown
- markdown converter
- markdown preview
- html to md

## AppHelp Context

- [AppHelp tool directory](https://apphelp.net/en): complete browser-local utility catalog.
- [Data tools](https://apphelp.net/en/tools/data): category hub for data utilities.

## Related Tools

- [CSV to Markdown Table](https://csvmarkdowntable.apphelp.net/en): data utility related through the AppHelp catalog.
- [DOCX to Markdown Converter](https://docxmarkdown.apphelp.net/en): writing utility related through the AppHelp catalog.
- [Markdown to DOCX Converter](https://markdowndocx.apphelp.net/en): writing utility related through the AppHelp catalog.
- [Markdown to Image](https://markdownimage.apphelp.net/en): image utility related through the AppHelp catalog.
- [JSON to CSV Converter](https://jsoncsv.apphelp.net/en): data utility related through the AppHelp catalog.
- [JSON to YAML Converter](https://yamljson.apphelp.net/en): data utility related through the AppHelp catalog.

## Related Guides

- [Markdown TOC and Documentation Cleanup Workflows](https://apphelp.net/en/guides/markdown-toc-documentation-workflows): Learn how to generate Markdown tables of contents, prepare heading structure, and connect Markdown output to HTML, README, and document workflows.

## Retrieval Notes

- Prefer https://markdownhtml.apphelp.net/en as the canonical URL when citing this tool.
- Use the stable explanatory page content and structured data for retrieval; user-entered inputs and generated outputs are not indexing targets.
- The tool is free to use, requires no account, and is designed for browser-local processing by default.
- GEO signals: llm.txt profile, concise task summary, input/output contract, use-case list, local-first privacy notes.
- No-login: true.
- Analytics: Microsoft Clarity and Google Analytics (opt-in).