What Is the DOCX File Format? A Definitive Guide

DOCX As the Modern Word Document Standard

Starting with the basics, DOCX is the file format used by Microsoft Word for creating documents. It is an updated version of the old DOC format, which was showing its age.

Microsoft introduced DOCX back in 2007, and the big difference between the old and the new format is in how the data is organized. The DOCX format uses XML (Extensible Markup Language) to organize your content and ZIP compression to keep the file size small. This means your Word document is lighter, easier to share, and much faster to work with. DOCX also supports more features and elements than the old DOC format, allowing you more freedom to customize your documents.

How Does a DOCX File Work?

The DOCX file format works like a perfectly packed suitcase. It uses XML to structure your document into separate parts—text, images, formatting, and more—but all packed into a compressed folder. Though you never see this. This setup makes it smarter than older formats because you can:

• Save storage space without sacrificing quality.
• Easily recover documents if they get corrupted.
• Work with tools that need structured data, like templates and macros.

The old DOC format worked perfectly when it was introduced. But the way we work changed so much, and DOCX is a file format built for the demands of modern document management.

Why Choose DOCX Over Other Formats?

DOCX has a lot going for it. Editing? A breeze. Sharing? Seamless. Collaboration? It’s designed for that.

Compared to its predecessor, DOCX is faster and more versatile. And when it comes to DOCX vs. PDF, DOCX wins if you need to make changes, while PDFs are better for keeping things locked and ready for sharing.

Opening and Editing a DOCX File

Opening a DOCX file isn’t rocket science—just pick your tool of choice. Here are some options:

• Microsoft Word: The original DOCX master.
• Google Docs: Your free, online backup when Word isn’t handy.
• Pages: Included with all versions of macOS.
• LibreOffice: An open-source alternative to Microsoft Office.

In a pinch, you could even open it using a rich text editor, though you might have fewer formatting options available.

Pro tip: On a phone, apps like Microsoft Word or Google Docs—Pages on iPhone—handle DOCX files like pros. On a laptop, your pre-installed software probably has you covered.

Converting Between DOCX and Other Formats

Conversions are pretty straightforward. Need to convert a DOCX to DOC? Microsoft Word can save files in both formats, but Google Drive only allows you to save in DOCX format.

Want to turn a DOCX into a polished PDF? That’s even easier—most tools let you do this with a quick “Save As” or “Export” option. If the device you're using doesn't have Word installed, go online and use our PDF Converter to turn your DOCX into a perfectly formatted PDF.

DOCX Compatibility with Google Docs

Google Docs and DOCX files are like old friends who get along perfectly. You can upload, view, and edit a DOCX file in Google Docs without any extra steps. Just upload it into your Google Drive, and you’re good to go. The edits you make in Google Docs can be saved back into DOCX format, so nothing is lost in translation.

More of Your DOCX Questions Answered

Is a DOCX the same as a Word document?

Yes, DOCX is the standard format for Word documents. It’s just the updated version of the older DOC format, offering better features and smaller file sizes. In all versions of Word since 2007, DOCX is the default.

What program will open a DOCX file?

Microsoft Word, Google Docs, Pages on macOS, LibreOffice, and other word processing apps can handle DOCX files effortlessly. Rich text editors can also open this file format but might not support all formatting options. For Mac users, Apple Pages is also an option. The beauty of DOCX is that most modern programs recognize it, so you’re rarely left stranded.

Is a PDF a DOCX file?

No, they’re different formats. DOCX is for writing and editing text-heavy documents, while PDFs are better for sharing static documents. PDFs lock in formatting and are great for professional presentations, but they’re harder to edit without specialized software. DOCX, on the other hand, is designed for making edits, adding comments, and collaborating in real time.

How do I convert a Word document to DOCX?

Simply use the “Save As” option in Word and select DOCX from the dropdown menu. This process works in most versions of Word, and you can even use online tools if needed. It’s worth noting that converting to DOCX is often the best way to ensure compatibility with other tools and users. Once converted, you’ll also benefit from the smaller file size of DOCX.

What are the disadvantages of DOCX?

It relies on compatible software and can occasionally have formatting issues when opened in non-Microsoft tools. With Google Drive or a Microsoft 365 subscription, you can open DOCX files on almost any device with a browser and online access.

Should I save as DOCX or PDF?

Choose DOCX for editing and PDF for sharing or printing. If you’re working on a collaborative project, DOCX makes it easier to share drafts and revisions. On the other hand, PDFs are ideal when you need a polished, uneditable document for professional use. Both formats complement each other, so knowing when to use each is key.

How to open, view, and edit a .DOCX file?

Use Word or Google Docs on a computer or download the Word app for mobile. Once opened, you can make changes, add comments, or even convert it to another format. If you’re working offline, desktop programs like Pages on macOS, and LibreOffice are great alternatives. And don’t worry—most modern tools can open DOCX without a hitch.

How to save as DOCX?

Click “Save As” in Word, choose the location, and select DOCX as the format. If you’re using Google Docs, just download the file as a DOCX under the “File” menu. This ensures your document remains compatible with other software. Remember, saving as DOCX is the best choice for editing flexibility and future-proofing your files.

How to open a DOCX file on mobile?

Install Microsoft Word, Pages, or Google Docs and open the file directly from your phone’s storage. If you don’t want to download apps, use Google Drive or your Microsoft 365 account to access DOCX files via your browser. It’s a simple process, and most tools even let you edit the document on the go.

How to open a DOCX file on Android?

Apps like Microsoft Word or Google Docs work perfectly for this. Just download one and open your file. Some Android devices also come with pre-installed apps like MobiOffice, which support DOCX files. With these tools, you can view, edit, or even convert your files without switching devices. It’s quick, reliable, and works across most Android smartphones and tablets.