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HTM to DOCX Converter

Convert HTM to DOCX online for free. Fast, secure, and high-quality conversion with no sign-up or software required.

Free to useNo file stored beyond 1 hourEncrypted over TLS 1.2/1.3No watermarks

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How it works

Three steps to your converted file

Everything happens in your browser tab - upload, pick a format, download. The heavy lifting runs on our servers.

01

Upload your file

Drag and drop, click to browse, or paste a URL. Batches take up to 20 files at once - 230+ input formats across video, audio, image, document, and archive types.

02

Choose an output format

Pick from over a hundred output formats. Filter by category or search by name - every option is open to everyone, no account needed.

03

Convert & download

Hit Convert and grab your download link moments later. Originals are erased when the job completes; results are cleared within about an hour.

What is an HTM file?

An HTM file is a HyperText Markup Language document used to structure web content, functionally identical to HTML files but utilizing a three-letter extension to accommodate legacy file system restrictions. This naming convention originated from the MS-DOS and Windows 3.x FAT file systems, which enforced an 8.3 filename limit (eight characters for the name, three for the extension). The file contains plain text adhering to W3C standards, utilizing tags to define the Document Object Model (DOM) elements such as headers, paragraphs, and embedded media references.

How to open an HTM file

All modern web browsers, including Google Chrome, Mozilla Firefox, Microsoft Edge, and Apple Safari, provide native support for rendering HTM files on any operating system. For editing purposes, the files can be opened in text editors or Integrated Development Environments (IDEs) such as Microsoft Visual Studio Code, Sublime Text, or Adobe Dreamweaver, which offer syntax highlighting for the markup.

HTM Technical Info

Full Name
HyperText Markup Language File
Developed By
W3C / WHATWG
Initial Release
1991
MIME Type
text/html

What is a DOCX file?

The DOCX format is the default document standard for Microsoft Word 2007 and newer, based on the Office Open XML (OOXML) specification standardized under ISO/IEC 29500 and ECMA-376. It functions as a compressed ZIP container that packages separate XML files (such as document.xml, styles.xml, and settings.xml) alongside media assets. This modular XML architecture allows for improved data recovery and smaller file sizes compared to legacy binary DOC files, while explicitly prohibiting the storage of VBA macros.

How to open a DOCX file

DOCX is natively supported by Microsoft Word 2007+ on Windows and macOS. Due to its status as an ISO standard, it has broad compatibility with non-Microsoft ecosystem tools; it can be opened and edited by Apple Pages, Google Docs, LibreOffice Writer, and Apache OpenOffice. Furthermore, because it is a ZIP archive, users can rename the extension to .zip to extract and inspect the internal XML structure and embedded media assets manually.

DOCX Technical Info

Full Name
Word Open XML Document
Developed By
Microsoft
Initial Release
2006
MIME Type
application/vnd.openxmlformats-officedocument.wordprocessingml.document

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Why RunConvert

The fastest way to convert any file

Purpose-built for speed, privacy, and breadth of format support.

Convert HTM to DOCX in seconds

Every HTM to DOCX conversion runs on our servers, so your device stays fast and the output quality stays intact.

Fast, cloud-powered

No queue, no waiting. Files are processed on high-performance servers and returned in seconds, even for large files.

Secure & private

Encrypted in transit and never shared with anyone. Uploads are erased the moment your job completes, and results shortly after.

Free - no account needed

Convert without creating an account - no credit card, no trial clock. Sign in only if you want history and higher daily limits.

Developer API

Convert HTM to DOCX via API

Automate HTM to DOCX conversions in three steps: create a job, upload your file, then poll for the result.

# 1. Create job
curl -X POST https://api.runconvert.com/v3/jobs \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "tag": "htm-to-docx",
    "tasks": {
      "upload-file": {
        "operation": "import/upload"
      },
      "convert": {
        "operation": "convert",
        "input": "upload-file",
        "output_format": "docx"
      },
      "export-result": {
        "operation": "export/url",
        "input": "convert"
      }
    }
  }'

# 2. Upload your file (use upload_url from the response)
curl -X PUT "$UPLOAD_URL" --upload-file input.htm

# 3. Poll for result
curl https://api.runconvert.com/v3/jobs/$JOB_ID?include=tasks \
  -H "Authorization: Bearer YOUR_API_KEY"

Replace YOUR_API_KEY with your RunConvert API key. Get your free API key at runconvert.com/api.