DOCX Won't Open? Convert to XHTML Instantly
Fast, instant DOCX to XHTML conversion. No signup required. Just drop your .docx file and get .xhtml in seconds.
Batch Settings
ビジネス文書の標準として広く使われているDOCXファイルを、ウェブコンテンツに最適なXHTML形式へ変換しませんか？ Wordで作成した企画書や報告書、美しいレイアウトの同人誌原稿などを、手軽にウェブサイトやオンライン出版物として公開できるようになります。DOCXの持つ表現力を損なうことなく、軽量で互換性の高いXHTMLへ移行することで、より多くの読者に情報を届けることが可能です。特に、縦書き文書の多い日本語環境において、ウェブ上での表示崩れを防ぎ、意図した通りのデザインを保持することは非常に重要です。当社の変換ツールは、そうした細やかなニーズにも対応し、高品質な変換を実現します。
- ビジネスレポートのウェブ公開
- 漫画・小説のオンライン配信
- IR資料の電子開示
日本語の縦書き文書やルビ（振り仮名）は、XHTML変換時にスタイルが崩れやすい特性がありますが、適切なCSSとマークアップを用いることで、ウェブ上でも美しく表示させることが可能です。
About DOCX to XHTML Conversion
Dealing with a DOCX file that won't open on your device? You're not alone — DOCX compatibility issues are one of the most common reasons people search for a file converter. DOCX is Microsoft Word's modern format based on Office Open XML — editable text documents with formatting.
The fix is simple: convert your DOCX to XHTML. XHTML is a widely used file format. This conversion lets you convert between formats quickly, solving the problem in seconds rather than hours of troubleshooting.
Converting DOCX to XHTML maintains high quality with CocoConvert's optimised encoder settings.
CocoConvert processes your DOCX file on secure servers in Germany — upload, convert, download. Your files are encrypted via TLS and automatically deleted within 24 hours. No account needed, no software to install, and it works on any device with a browser.
This conversion is ideal when you When you need a XHTML file.
The conversion engine behind CocoConvert uses FFmpeg, Sharp, and qpdf — the same open-source libraries trusted by Netflix, YouTube, and enterprise platforms. Pro users can batch convert up to 100 files at once.
How to Convert DOCX to XHTML
- 1
Add your DOCX file
Drag and drop your .docx file into the converter, or tap "Browse" to pick it from your device. Multiple files are supported for batch processing.
- 2
Pick XHTML output
Select .xhtml as the target format. CocoConvert automatically applies the best quality settings for this conversion.
- 3
Start conversion
Hit the Convert button. The document engine processes your file server-side — no CPU drain on your device.
- 4
Save your file
Once done, download your .xhtml file. For batch jobs, download all at once as a zip.
What Happens When You Convert DOCX to XHTML
Your DOCX file is decoded and re-encoded as XHTML.
Your DOCX 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
DOCX
.docx file
| Extension | .docx |
| MIME Type | application/vnd.openxmlformats-officedocument.wordprocessingml.document |
| Category | Document |
XHTML
.xhtml file
| Extension | .xhtml |
| MIME Type | application/xhtml+xml |
| Category | Document |
Should You Convert DOCX to XHTML?
When to Convert
- ✓When you need a XHTML file
Frequently Asked Questions
Why won't my DOCX file open?
DOCX files may not open if your device lacks the right codec or application. Converting to XHTML — a more widely supported format — usually resolves this. XHTML is a widely used file format.
Is it safe to convert DOCX to XHTML online?
Yes. CocoConvert encrypts your file via TLS, processes it on isolated servers in Germany, and permanently deletes it within 24 hours. Your files are never shared or analysed.
Will I lose quality converting DOCX to XHTML?
Converting DOCX to XHTML maintains high quality with CocoConvert's optimised encoder settings. CocoConvert uses high-quality encoder defaults to preserve as much fidelity as possible.
How large can my DOCX file be?
Free users can convert files up to 250 MB each. Pro users get a 5 GB limit per file, and Business API users have custom limits.
Can I convert DOCX to XHTML on my phone?
Absolutely. CocoConvert works in any modern browser — iOS Safari, Android Chrome, and all desktop browsers. No app required.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.