HTM vs XHTML — Comparison & Free Converter
Fast, instant HTM to XHTML conversion. No signup required. Just drop your .htm file and get .xhtml in seconds.
Batch Settings
ウェブの世界は日々進化し、その基盤となるマークアップ言語もまた、より厳密で柔軟な表現が求められるようになりました。かつて主流であったHTMは、その自由度の高さゆえにブラウザ間の表示差異や将来的な互換性の課題を抱えることがあります。そこで、XMLの厳格な文法を取り入れ、より構造化されたウェブコンテンツの作成を可能にするXHTMLへの変換が注目されています。これは、特に視覚的な美しさや正確な情報伝達が重視される日本のウェブデザインにおいて、その真価を発揮するでしょう。当ツールは、お客様の貴重なHTMファイルを、次世代のウェブ標準に準拠したXHTMLへとスムーズに移行させるお手伝いをいたします。
- 電子書籍（漫画・小説）の長期保存
- 企業内文書の統一とアクセシビリティ向上
- 縦書きウェブコンテンツの正確なレイアウト
日本では、XHTMLが提供する厳密な構造が、特に日本語の複雑な組版や多様な文字表現を正確にウェブ上で再現するために評価されてきました。これにより、デザインの一貫性やアクセシビリティの確保が容易になります。
About HTM to XHTML Conversion
HTM or XHTML — which format should you use? The answer depends on your needs. Here's a quick breakdown.
HTM is a widely used file format. It has common platform support. XHTML is a widely used file format. It has common platform support.
So when should you convert HTM to XHTML? This conversion is ideal when you When you need a XHTML file. This conversion helps you convert between formats quickly.
Converting HTM to XHTML maintains high quality with CocoConvert's optimised encoder settings.
If you've decided XHTML is the right choice, CocoConvert makes the conversion effortless. Upload your .htm file, pick XHTML, and click Convert — done in seconds. The converter runs on secure servers in Germany, powered by FFmpeg, Sharp, and qpdf. Files are encrypted via TLS and erased within 24 hours.
Free tier: 5 files/hour, 250 MB each. Pro: 100 files/hour, 5 GB each. Works in every modern browser on desktop and mobile.
How to Convert HTM to XHTML
- 1
Choose your HTM file
Upload your .htm file using drag-and-drop or the file browser. Batch mode lets you add multiple files.
- 2
Set format to XHTML
Select .xhtml from the output options. The converter applies optimal quality settings automatically.
- 3
Run the conversion
Click Convert. Server-side processing means your device stays fast — even for large document files.
- 4
Get your XHTML file
Download your converted file instantly. Batch downloads are available as a zip archive.
What Happens When You Convert HTM to XHTML
Your HTM file is decoded and re-encoded as XHTML.
Your HTM file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in XHTML format
The converted file is ready for download
Format Comparison
HTM
.htm file
| Extension | .htm |
| MIME Type | text/html |
| Category | Document |
XHTML
.xhtml file
| Extension | .xhtml |
| MIME Type | application/xhtml+xml |
| Category | Document |
Should You Convert HTM to XHTML?
When to Convert
- ✓When you need a XHTML file
Frequently Asked Questions
Should I use HTM or XHTML?
It depends on your goal. HTM preserves full quality. XHTML preserves full quality. Choose based on whether file size or quality matters more for your use case.
Is XHTML higher quality than HTM?
Not necessarily. Converting HTM to XHTML maintains high quality with CocoConvert's optimised encoder settings. Quality depends on the compression type and settings, not just the format name.
Can I convert HTM to XHTML on Mac and Windows?
Yes. CocoConvert is a web-based tool that works in all modern browsers — Chrome, Safari, Firefox, Edge — on any operating system including macOS, Windows, Linux, iOS, and Android.
Is CocoConvert free for HTM to XHTML?
Yes. Free users get 5 conversions per hour (250 MB each). Pro subscribers unlock 100 files per hour, 5 GB per file, and priority processing.
What tools does CocoConvert use for HTM to XHTML?
CocoConvert uses FFmpeg for audio/video, Sharp for images, and qpdf for documents — the same open-source libraries used by Netflix, YouTube, and major enterprise platforms.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.