Upload saved HTML, not a URL
The public converter does not fetch remote pages. Save or export the HTML you are authorized to process, then upload that file.
HTML conversion
HTML can describe everything from a focused article to an entire application shell. Markdown intentionally has a smaller vocabulary. Conversion works best on saved, content-oriented HTML and produces a draft that is easier to diff, version, and move between documentation tools.
Supported extensions: .html, .htm. Files are processed temporarily and are not placed in public URLs.
Best fit
Structure-first conversion
Saved articles, documentation pages, release notes, README migrations, and semantic HTML fragments that do not depend on client-side rendering.
Useful structure
Manual review
Small example
Semantic elements translate cleanly; presentation CSS is deliberately left behind.
<article><h1>API status</h1><p>All systems <strong>operational</strong>.</p><a href="/history">History</a></article>
# API status All systems **operational**. [History](/history)
Better input, cleaner output
The public converter does not fetch remote pages. Save or export the HTML you are authorized to process, then upload that file.
Removing site navigation and page chrome before conversion reduces repetitive cleanup.
A link such as /docs/setup depends on its original site. Replace it with an absolute or repository-appropriate destination when needed.
For a repeatable review process, read the conversion best-practices guide and the guide to cleaning converted Markdown.
Practical answers about what the conversion does—and what still deserves a human review.
No. The public endpoint accepts uploaded files only and does not perform remote URL conversion. This keeps the conversion boundary narrower and more private.
No. Markdown carries content hierarchy rather than presentation rules. CSS, responsive layouts, and interactive behaviors are omitted.
Converted content is treated as untrusted, and the editor preview sanitizes rendered output. You should still review external links and embedded references before publishing.
Related workflows
Upload a supported HTML file, convert it privately, and continue in the Markdown editor without exposing its contents in the URL.
Convert HTML to Markdownプライバシーの選択
許可された場合にのみ Google Analytics を使用し、訪問数と機能の利用状況を把握します。アップロードファイル、変換後の Markdown、エディター内容、ファイル名を解析へ送信することはありません。
必要なローカルストレージは、選択内容と非公開のエディター下書きを保存します。
任意の解析では、Google Analytics Cookie を保存し、利用状況、端末、ブラウザー、おおよその位置情報を収集する場合があります。