Why can't this convert .doc in the browser?

The .doc binary format is a proprietary Compound Document File Format with hundreds of undocumented record types. Parsing it faithfully requires a full Office compatibility engine (like LibreOffice or Word), which cannot run in a browser.

How do I convert .doc to .docx for free?

Option 1: Open the .doc in Microsoft Word and use File → Save As → .docx. Option 2: Open in LibreOffice Writer (free) and export as .docx. Option 3: Upload to Google Docs (free) — it converts automatically on import.

Will I lose content converting DOC to DOCX?

In most cases no content is lost. Very old macros or embedded objects may not map perfectly, but text, images, tables, and common formatting are preserved.

Is LibreOffice really free?

Yes — LibreOffice is completely free and open-source. Download it from libreoffice.org.

What can I do with the .docx file after converting?

Use our other tools — or open it directly in Microsoft Word, Google Docs, or LibreOffice Writer.

All ToolsPricingBlog

All ToolsDOC to DOCX

DOC to DOCX

Convert legacy .doc files to modern .docx format. Browser conversion isn't possible for this format — follow the free step-by-step methods below.

GuestGUEST

10 uses remaining today

Browser conversion not available for .doc

The legacy .doc binary format requires a full Office engine to parse. Use one of the free methods below — each takes under a minute.

3 Free Ways to Convert

Microsoft Word

Best quality

Open the .doc file → File → Save As → change format to .docx → Save.

LibreOffice Writer (free)

Free & offline

Open the .doc file in LibreOffice Writer → File → Save a Copy → choose .docx format.

Google Docs (free, online)

No install

Go to docs.google.com → Upload the .doc file → it opens automatically → File → Download → Microsoft Word (.docx).

Once you have a .docx file…

📝Convert ODT to DOCX 📄Convert RTF to PDF

Your files never leave your device. All processing happens locally in your browser — nothing is uploaded to our servers.Files are never stored on our servers · No tracking of your file contentsPrivacy Policy

What is DOC to DOCX?

DOC to DOCX upgrades legacy Microsoft Word .doc files (Office 97–2003 binary format) to the modern .docx format (Office Open XML). DOCX files are smaller, more compatible, and supported by all modern apps.

How It Works

The legacy .doc format is a complex binary format (Compound Document File Format) that cannot be decoded in the browser. The steps below explain how to convert .doc to .docx for free using desktop software or free online services.

How to Use

1
Upload your DOC file
Drop an older .doc file onto the upload zone. The legacy Word binary format is read and parsed locally.
2
Convert
Click "Convert to DOCX". The document content, styles, and formatting are converted to the modern Open XML DOCX format.
3
Download the DOCX
Save the .docx file and open it in Microsoft Word 2007 or later, Google Docs, or LibreOffice Writer.
4
Edit freely
The DOCX format supports all modern Word features including tracked changes, comments, and advanced styles.
5
Convert to PDF when done
Once your edits are complete, use the Word to PDF tool to produce a polished PDF output.

Who Uses This Tool

🗄️

Legacy Archives

Upgrade a folder of old .doc files from the 1990s–2000s to modern DOCX so they open cleanly in current software.

🤝

Cross-App Sharing

Convert .doc files before sharing with colleagues who use Google Docs, LibreOffice, or Word for Mac.

📧

Email Attachments

Some email clients and cloud storage warn about legacy .doc files — convert to .docx to avoid compatibility issues.

📝

Template Modernization

Update company document templates from old .doc format to DOCX to take advantage of modern styles and themes.

🔄

PDF Workflow

Convert .doc to .docx first, then use the Word to PDF tool for a reliable, high-quality PDF export.

🏢

IT Migration

IT teams bulk-converting a document library from legacy Office formats to modern DOCX for compatibility.

Why Choose This Tool

Three Free Methods

Word, LibreOffice, and Google Docs all convert .doc to .docx for free — no paid converter needed.

Full Fidelity

Text, images, tables, headers, and common formatting are all preserved during the conversion.

No Upload Needed

Converting locally in Word or LibreOffice means your document never leaves your device.

Smaller File Size

DOCX files use ZIP compression and are typically 20–50% smaller than equivalent .doc binary files.

Modern Features

Once in DOCX format, you can use tracked changes, comments, and advanced Word styles not available in .doc.

PDF-Ready

After conversion, the DOCX integrates seamlessly with our Word to PDF tool for final document delivery.

Also Try

Word to PDF ODT to DOCX PDF to Word HTML to Word Compress PDF Merge PDF

Key Benefits

.docx is smaller in file size than equivalent .doc files
DOCX is supported by Word, LibreOffice, Google Docs, and all modern apps
Open XML format is more repairable and future-proof
Free tools exist to convert without buying Microsoft Office
Once converted, use our other tools to export to PDF

Frequently Asked Questions

Also Known As

doc to docx converter freeconvert old word doc to docxupgrade doc file to modern word formatopen doc file in google docslibreoffice convert doc to docxdoc to docx without microsoft wordbatch convert doc files to docx

Related Tools

Word to PDF

Convert DOC and DOCX Word documents to PDF without losing formatting.

PDF to Word

Convert PDF files into fully editable Word DOCX documents.

Word to JPG

Export each page of a Word document as a JPG image.

Word to HTML

Convert a Word document to clean, web-ready HTML.

HTML to Word

Import an HTML file or paste HTML markup and export it as a DOCX.

ODT to DOCX

Convert LibreOffice ODT files to Microsoft Word DOCX format.

Trusted Worldwide

Free Online Document Tools for Everyone

iLoveDocsTools is used by students, professionals, and businesses across the United States, Canada, United Kingdom, Australia, India, and more than 100 other countries. All tools are browser-based and process files privately — your files never leave your device. Free to use, with Pro plans for unlimited access.

No Upload Required

All processing happens directly in your browser. Your documents are never sent to any server — complete privacy guaranteed for users in the USA, Canada, UK, and worldwide.

Free to Use — Pro Plans Available

Every tool on iLoveDocsTools is free to use. Need more? Upgrade to Pro for unlimited usage, priority access, and no daily limits. Trusted by students, freelancers, and teams across North America and Europe.

Works on Any Device

Whether you are on a Mac, Windows PC, iPhone, or Android in New York, Toronto, London, or Sydney — our tools work instantly in any modern browser.

Looking for free PDF tools in the USA? Free document converters in Canada? Online PDF editors in the UK or Australia? iLoveDocsTools offers 70+ free tools — merge PDF, split PDF, compress PDF, convert Word to PDF, Excel to PDF, JPG to PDF, and many more — all free, all instant, all private. No watermarks. No file size limits. Just free tools that work.