HTML vs HTM — Comparison & Free Converter
Fast, instant HTML to HTM conversion. No signup required. Just drop your .html file and get .htm in seconds.
Batch Settings
ウェブサイトのファイル名、特に拡張子には、時としてちょっとした「こだわり」や「慣習」が息づいていますよね。HTMLとHTM、この二つの拡張子は、技術的にはほとんど同じ機能を持ちながらも、ウェブの歴史やサーバー環境、あるいは単なる個人の好みによって使い分けられてきました。古いシステムとの互換性を保ちたい場合や、特定のサーバー設定でファイル認識をスムーズにしたい時、あるいは単にファイル名を少しでも短くしたいといった細やかなニーズに応えるのが、このHTMLからHTMへの変換です。見た目は些細な違いかもしれませんが、ウェブコンテンツを扱う上で、そうした「ちょっとした調整」が全体の調和を生み出すことも少なくありません。当サイトでは、お客様のそうした細やかなご要望にお応えするため、簡単かつ迅速に変換できるツールをご提供いたします。
- 旧式サーバーでの互換性確保
- ファイル名統一による管理効率化
- ファイルパス短縮によるURLの視認性向上
日本では、特に古いウェブサイトやシステムでは、8.3形式のファイル名制限の影響からHTM拡張子が使われるケースが今でも見られます。これは、ウェブコンテンツの長期的な安定運用を考慮する上で、時に重要な選択肢となります。
About HTML to HTM Conversion
HTML or HTM — which format should you use? The answer depends on your needs. Here's a quick breakdown.
HTML (HyperText Markup Language) is the standard language for web pages. It has universal platform support. HTM is a widely used file format. It has common platform support.
So when should you convert HTML to HTM? This conversion is ideal when you When you need a HTM file. This conversion helps you convert between formats quickly.
Converting HTML to HTM maintains high quality with CocoConvert's optimised encoder settings.
If you've decided HTM is the right choice, CocoConvert makes the conversion effortless. Upload your .html file, pick HTM, 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 HTML to HTM
- 1
Choose your HTML file
Upload your .html file using drag-and-drop or the file browser. Batch mode lets you add multiple files.
- 2
Set format to HTM
Select .htm 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 HTM file
Download your converted file instantly. Batch downloads are available as a zip archive.
What Happens When You Convert HTML to HTM
Your HTML file is decoded and re-encoded as HTM.
Your HTML file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in HTM format
The converted file is ready for download
Format Comparison
HTML
.html file
| Extension | .html |
| MIME Type | text/html |
| Category | Document |
HTM
.htm file
| Extension | .htm |
| MIME Type | text/html |
| Category | Document |
Should You Convert HTML to HTM?
When to Convert
- ✓When you need a HTM file
Frequently Asked Questions
Should I use HTML or HTM?
It depends on your goal. HTML preserves full quality. HTM preserves full quality. Choose based on whether file size or quality matters more for your use case.
Is HTM higher quality than HTML?
Not necessarily. Converting HTML to HTM 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 HTML to HTM 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 HTML to HTM?
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 HTML to HTM?
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.