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將 DOC 轉換為 DOCX

Free online DOC to DOCX converter. Fast, secure, no signup required.

12.9K+ files converted

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Accepted: DOC files · Max 100 MB per file

doc docx

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Need to convert DOC to DOCX? MegaConvert makes it easy. Upload your Microsoft Word Document (DOC) file and get a Microsoft Word Open XML Document (DOCX) file in seconds — no software to install, no signup required. Whether you need this conversion for office work, academic writing, legal documents, email attachments / archival, our online converter handles it instantly. Free for files up to 25MB, with support for larger files up to 2GB.

How to Convert DOC to DOCX Online

  1. 1
    Upload your DOC file

    Click the upload area or drag and drop your DOC file. Files up to 25MB are free. Larger files are supported with pay-per-use.

  2. 2
    Choose DOCX as output format

    DOCX is automatically selected on this page. You can adjust conversion settings if needed.

  3. 3
    Click Convert

    Hit the Convert button to start processing. Your file will be converted using our high-performance servers.

  4. 4
    Download your DOCX file

    Once conversion is complete, click Download to save your new DOCX file. Free files are available for 1 hour.

Why Convert DOC to DOCX?

  • **Modernize your files** — DOC is an older format. Converting to DOCX ensures better compatibility with current software and devices.
  • **Better efficiency** — DOCX offers improved compression and quality compared to older formats, reducing file sizes while maintaining fidelity.
  • **Reduce file size** — Converting between formats can significantly reduce file size, making files easier to share via email or cloud storage.
  • **Software requirements** — Your software or platform may require DOCX format specifically. Converting ensures full compatibility.

DOC vs DOCX — Format Comparison

Feature DOC DOCX
Full Name Microsoft Word Document Microsoft Word Open XML Document
Developer Microsoft Microsoft
First Released 1983 2007
Category Document Document
Extension .doc .docx
MIME Type application/msword application/vnd.openxmlformats-officedocument.wordprocessingml.document

Complex formatting may not transfer perfectly between all formats. PDF preserves layout best.

About DOC Format

Legacy Microsoft Word binary document format widely used for word processing.

Full name: Microsoft Word Document

Developer: Microsoft (1983)

About DOCX Format

Modern Microsoft Word format based on Open XML standard with ZIP compression.

Full name: Microsoft Word Open XML Document

Developer: Microsoft (2007)

常見問題

Upload your DOC file to MegaConvert.io, select DOCX as the output format, and click Convert. Your converted file will be ready to download in seconds. No software installation required.
Yes! Files up to 25MB can be converted for free, up to 3 times per day. For larger files, pay-per-use pricing starts at just $2 for files up to 100MB.
Absolutely. All uploaded files are encrypted in transit (HTTPS), scanned for viruses, and automatically deleted after conversion. We never share or access your files.
Free users can convert files up to 25MB. Pay-per-use supports files up to 2GB. Subscribers get up to 2GB with priority processing.
Legacy Microsoft Word binary document format widely used for word processing. Developer: Microsoft (1983).
Modern Microsoft Word format based on Open XML standard with ZIP compression. Developer: Microsoft (2007).