Convert DOC to DOCX Online

CONVERT DOC to DOCX ONLINE

1) Upload DOC file to convert

Drop files here, or Click to select

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Allowed file types: one, docx, doc, wbk, rtf, rvf, odt, abw, txt, dotx, docm, hwp, wpd, wps, tmd

2) Set converting DOC to DOCX options

3) Get converted file

DOWNLOAD CONVERTED FILE

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Get Total Doc Converter to convert DOC, DOCX, TXT, RTF in batch.

Doc Converter To Convert Word and Doc files

Convert DOC Files in Batch!;
Convert DOC to DOCX and in many other formats
Convert hundreds of files in 3 clicks;
Have a desktop converter that works without Internet;
Keep your files safe, convert Doc files without sending them to the web;
Get a more poweful engine to process large files.

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Total Doc Converter

Total Doc Converter supports DocX (the format of Word 2007 documents). Installed this free Microsoft Office Compatibility Pack to convert DocX files to HTML, PDF, XLS, JPG, TIFF, TXT with Total Doc Converter.

Total Doc Converter converts Doc to PDF and allows you to add a digital signature to the final document.

Convert and combine several documents into one multi-page file (PDF, DOC, TIFF or a very long TXT file). All done in one go!

Total Doc Converter can convert Word 2010 to Word 2003 if you need a file compatible with older Microsoft Word.

Have an outdated Microsoft Office 2003? Update all your old files to the new format in one go. Convert Doc files to DocX with our Total Doc Converter.

Total Doc Converter allows setting your default font for text files.

Total Doc Converter can print out, fax to send to OneNote any file you select. It will also create detailed reports on your Doc files in PDF, XLS, CSV, TXT formats. It's the esiest way to learn how many files you have and their parameters.

Total Doc Converter has a clear, easy-to-follow interface. You won't get lost in settings!

The widest list of supported file types: convert Word, Doc, DocX, DocM, RTF, RVF, or TXT files to RTF, DOCX, XLS, JPEG, PNG, TIFF, HTML, XHTML, PDF, TXT in a batch mode. It's a powerful all-in-one doc converter!

Total Doc Converter supports several types of compression for TIFF. If you are at a loss the program will automatically choose the best value.

Every document is displayed in Preview panel. You can zoom it or view the document full-sized. Use preview option to quickly find a file.

Add your logo or any other image to the header or the footer of the output file.

Do you want more order? Total Doc Converter will add page counters or a date to every page of the output files. The app is great for stamping legal bates too!

Total Doc Converter can copy original time stamps if you want to keep them.

Total Doc Converter offers a lot of additional settings for Doc to PDF conversions. Set user permissions, password-protect your files or sign with a digital signature. Get PDF, PDF/A and non-searchable PDFs.

Total Doc Converter can be run via command line (get the ready-to-use command line from GUI).

How to convert DOC to DOCX?

💾 Upload Your File: Go to the site, click on «Upload File,» and select your DOC file.

✍️ Set Conversion Options: Choose DOCX as the output format and adjust any additional options if needed.

Convert and Download: Click 👉«Download Converted File»👈 to get your DOCX file.

Cloud Based

There is no need to install any software to convert DOC to DOCX with CoolUtils. Simply access the internet, and you can easily convert your file online with our service.

Secure

Our hardware operates in top-tier, highly secure data centers equipped with advanced electronic surveillance and multi-factor access control systems.

Ease of Use

Converting DOC to DOCX online has never been so simple. Drop your Word 97–2003 binary .doc file and the converter rewrites it as an Office Open XML .docx — the ISO-standardized format supported by every modern word processor. Formulas, tables, tracked changes, headers, footers, and embedded images are all preserved. No Word installation required.

Privacy

We understand the importance of privacy, which is why we've developed a comprehensive privacy policy detailing how we handle your files and personal information. You can read the policy here.

Doc (Word) File

File extension	.DOC
Category	Document File
Description	DOC is a native MS Word text format that supports markup and rich text styling. As opposite to TXT, together with texts DOC file can contain various formatting parameters, tables, images, other graphic elements and charts. Documents of such type are readable by MS Word, free Microsoft Word Viewer and many open source packages like LibreOffice. DOC files can be read and edited on Android OS by Kingsoft Office For Android. Since Word 2007 new, improved format version is used - DOCX.
Associated programs	AbiWord Apple Pages AppleWorks KWord Microsoft Word StarOffice
Developed by	Microsoft
MIME type	application/msword
Useful links	More detailed information on DOC files
Conversion type	DOC to DOCX

DOCX File

File extension	.DOCX
Category	Document File
Description	DOCX is an MS Office text format of new generation (starting from 2007 versions). It is a more open, more standardized version that allows various apps get easier access to data stored in Word files. DOCX files are lighter in size than DOC analogues due to a new, XML-based file structure. As opposite to DOC, a corrupted DOCX file still can be opened, and undamaged data still can be read and edited. Older Word versions can work with DOCX, if a free compatibility pack is installed and setup.
Associated programs	Microsoft Word 2007 Microsoft Word 2008 (MAC) OxygenOffice Professional (Linux) Word 2010
Developed by	Microsoft
MIME type	application/vnd.openxmlformats-officedocument.wordprocessingml.document
Useful links

Rating DOC to DOCX

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DOC to DOCX Converter — Frequently Asked Questions ▼

Why does my DOC file look different when opened in LibreOffice or Google Docs compared to Microsoft Word?

DOC (BIFF8 binary format) is a proprietary Microsoft format. LibreOffice and Google Docs use reverse-engineered parsers that handle most cases correctly but may substitute fonts, reflow text, or misinterpret complex table structures. Converting to DOCX (Office Open XML) improves compatibility because DOCX is an ISO standard (ISO 29500) that LibreOffice, Google, and Apple have all implemented more thoroughly than the older binary DOC format.

Are macros and VBA preserved when converting DOC to DOCX?

Macros embedded in DOC files (WordBasic or VBA) are carried into the DOCX output as a .docm file (DOCX with macro support) when the converter preserves VBA, or stripped when producing a clean .docx. The online converter produces standard .docx output without macros — if you need to preserve VBA, use Total Doc Converter on the desktop, which provides options for macro handling.

Will all fonts and formatting survive DOC to DOCX conversion?

Yes, with one exception: fonts that were embedded in the DOC file using OLE font embedding may require those fonts to be installed on the viewing machine. The paragraph styles, character styles, table formatting, headers, footers, and numbered lists all transfer to DOCX. Custom styles defined in the DOC's style sheet are carried over as named styles in the DOCX.

Can I convert a password-protected DOC file?

Password-protected DOC files cannot be converted without the password — the binary content is encrypted and unreadable without the correct decryption key. Remove the password protection in Word or LibreOffice before uploading for conversion.

Does the converter handle DOC files with tracked changes and comments?

Yes. Tracked changes (revisions) and comments stored in the DOC file are preserved in the DOCX output. They appear as revision markup and comment bubbles when the DOCX is opened in Word or LibreOffice, exactly as in the original.

What is the maximum DOC file size the online converter accepts?

The online converter accepts DOC files up to 50 MB. DOC files larger than this — common with heavily embedded images or many OLE objects — should be converted with Total Doc Converter (Windows desktop, $49.90), which has no size limit and supports batch conversion of entire folder hierarchies.

I have hundreds of DOC files to convert to DOCX — is batch conversion possible?

The online converter handles multiple uploads. For migrating large DOC archives — legacy legal files, scanned document repositories, or pre-2007 corporate document stores — Total Doc Converter (Windows, $49.90) processes entire directory trees from the command line: `TotalDocConverter.exe C:\docs C:\output /ConvertTo docx /ProcessRecursively`.

Convert DOC to DOCX Online — Upgrade Legacy Word Documents

DOC files created in Word 97–2003 open in modern Word but carry the weight of a binary format that tops out at 32 MB for embedded objects and lacks XML-based recovery. DOCX is Word's standard since 2007: an Open XML ZIP container, smaller on disk, readable by every modern tool. Drop your .doc here and the converter rewrites it as a fully-standard .docx — formulas, tables, tracked changes, headers, footers, and embedded images intact.

What Is a DOC File?

DOC (BIFF8 binary format) is the Word 97–2003 file format. It stores the entire document as a single binary stream using the Compound Document File Format (OLE2). DOC supports all classic Word features — paragraphs, styles, tables, embedded OLE objects, VBA macros — but the binary format makes it opaque to non-Microsoft software. Files tend to run 2–5× larger than equivalent DOCX files. Word 2007 and later still open DOC files, but Microsoft ended mainstream DOC output when it introduced DOCX as the default save format.

What Is a DOCX File?

DOCX (Office Open XML) is the Word format introduced with Office 2007 and standardized as ISO 29500. Internally it is a ZIP archive containing XML files for document content, styles, relationships, and embedded media. The XML structure makes DOCX files recoverable if partially damaged, transparent to search indexers, and processable by any XML toolkit. Google Docs, LibreOffice Writer, Apple Pages, and every modern word processor reads DOCX natively. File size is typically 50–70% smaller than the equivalent DOC. DOCX is the de facto standard for Word documents today.

DOC vs DOCX — Key Differences

Feature	DOC (Word 97–2003)	DOCX (Word 2007+)
Internal format	Binary OLE2 stream	XML inside ZIP archive
File size	Larger (binary overhead)	50–70% smaller
Corruption recovery	Difficult (binary)	Easier (XML is partially readable)
Google Docs support	Partial	Full native support
LibreOffice support	Good but not perfect	Full support
SharePoint / M365 indexing	Limited	Full text search
ISO standard	No	ISO 29500
Default in Word today	No (legacy)	Yes

How to Convert DOC to DOCX Online

Click Choose File or drag your .doc file into the upload area above.
The converter reads the binary BIFF8 structure of the DOC file — text runs, paragraph formatting, table cells, embedded objects, and VBA macros are all parsed.
The document is re-serialized into Office Open XML and packaged as a standards-compliant .docx ZIP container.
Click Download to save the .docx file.
Open in Word, LibreOffice, or Google Docs to verify the result.

When Do You Need DOC to DOCX Conversion?

Email systems rejecting DOC: Some corporate mail filters now block .doc attachments due to macro risks. DOCX passes where DOC is flagged.
Google Drive upload: Google Docs converts DOCX with much higher fidelity than DOC — fonts, styles, and tables survive better.
SharePoint document libraries: SharePoint search indexes DOCX fully; DOC indexing is partial and sometimes skipped.
Archiving legacy files: Migrating decades-old DOC archives to DOCX preserves content in a format that will remain supported long-term.
Reducing file size: Converting a large DOC to DOCX typically cuts disk space by more than half — useful for cloud storage quotas.

Feature	Online Converters	CoolUtils Desktop	WinWord Built-in	Other Software
Batch Conversion	Limited	✅ Unlimited	Manual only	Limited
File Size Limit	1-5MB	✅ No limits	System dependent	Varies
Privacy & Security	Upload required	✅ 100% offline	✅ Local only	Varies
Conversion Speed	Internet dependent	✅ Fast local processing	Slow	Medium
Advanced Options	Basic	✅ Full customization	Limited	Basic
Cost	Free/Premium	One-time purchase	Requires Office	Subscription
Formatting Preservation	Good	✅ Excellent	Good	Varies
Multiple Formats Support	Limited	✅ 40+ formats	Few formats	Limited