Yes, .docx is the standard Word document format
.docx is Microsoft Word's native file format. When you save a document in Microsoft Word 2007 or later, it saves as .docx by default. The format replaced the older .doc format and is now the industry standard for word processing documents across Windows, Mac, and web-based versions of Word.
The "x" at the end stands for "Office Open XML," which is the underlying technical structure. This matters because it means .docx files are actually compressed folders containing XML code, images, and formatting instructions — not a single solid file like older .doc files were. You can open a .docx file with Word, Google Docs, LibreOffice, and dozens of other programs.
If someone sends you a .docx file or you download one from the internet, it is a Word document. You do not need to convert it or wonder about compatibility — it will open in Word or most other document editors without any special steps.
Key Takeaways
- .docx is Microsoft Word's default format for documents created in Word 2007 and all versions since then.
- The format works across Windows, Mac, and web browsers, and most document programs can open .docx files without conversion.
- Older Word documents saved as .doc are a different format, though Word can open both .doc and .docx without any trouble.
- The .docx format stores formatting, images, and text in a compressed structure, which is why file sizes are usually smaller than older .doc files.
How .docx differs from the older .doc format
Microsoft Word used the .doc format from 1997 through 2003. Starting with Word 2007, the company switched to .docx. The main difference is how the files store information: .doc files use a proprietary binary format that only Microsoft Word could read reliably, while .docx uses an open standard called Office Open XML that other programs can understand.
In practical terms, this means .docx files are smaller, more secure, and more compatible with non-Microsoft programs. Word can still open .doc files without any problem, and you can save a .doc file as .docx by opening it in Word and choosing "Save As" with the .docx format. Most people will never need to think about this distinction unless they are working with very old documents from the 1990s or early 2000s.
What programs can open .docx files
Microsoft Word is the primary program for opening and editing .docx files, but it is far from the only one. Google Docs can open .docx files directly from your computer or from Google Drive, and you can edit them in the browser without installing anything. LibreOffice, which is free and open-source, handles .docx files with full formatting support.
Apple Pages, WPS Office, Zoho Writer, and dozens of smaller word processors all support .docx. Even some basic text editors can read the text inside a .docx file, though they may not preserve formatting like bold, italics, or images. If you receive a .docx file and do not have Word installed, Google Docs is usually the fastest way to open it — you can upload the file to Google Drive and edit it there for free.
Why .docx files are smaller than .doc files
The .docx format compresses the document's contents, which is why a .docx file with the same text and images as a .doc file will usually be noticeably smaller. This compression happens automatically — you do not have to do anything to enable it. The smaller file size makes .docx documents faster to email, upload, or store on cloud services.
The compression also makes .docx files more resilient. If a .docx file becomes corrupted, recovery tools can sometimes extract the text and formatting from the compressed structure. A corrupted .doc file is often unrecoverable.
Opening a .docx file on different devices
On Windows, double-clicking a .docx file will open it in Word if Word is installed, or in whatever word processor you have set as the default. On Mac, the same applies — Word, Pages, or another program will open depending on what you have installed. If you do not have any word processor installed, you can right-click the file, choose "Open With," and select from available programs.
On a smartphone or tablet, you can open .docx files in the mobile versions of Microsoft Word, Google Docs, or other word processing apps. You can also email the file to yourself and open it from your email app, or upload it to a cloud service like OneDrive, Google Drive, or Dropbox and open it from there. Most phones and tablets will prompt you to choose which app to use when you tap a .docx file.
Converting .docx to other formats
If you need to save a .docx file as a different format — such as .pdf, .txt, or .doc — you can do this in Word by opening the file and choosing "Save As." Word will show you a list of available formats. Google Docs also offers a "Download" option that lets you save as .pdf, .docx, .odt, .rtf, .txt, or .zip. LibreOffice has similar options.
Converting to .pdf is common when you want to send a document that should not be edited, or when you need to preserve exact formatting across different computers. Converting to .txt removes all formatting and keeps only the text itself. Most conversions happen instantly and require no special software beyond the word processor you are already using.
Frequently Asked Questions
Can I open a .docx file without Microsoft Word?
Yes. Google Docs, LibreOffice, Apple Pages, and many other programs open .docx files. Google Docs is free and works in any web browser — you can upload a .docx file to Google Drive and edit it there without installing anything.
Is .docx the same as .doc?
No, they are different formats. .doc is the older Word format from 1997–2003, and .docx is the newer format from 2007 onward. Word can open both, but .docx files are smaller and more compatible with other programs.
Why is my file showing as .docx instead of .doc?
If you saved it in Word 2007 or later, it automatically saved as .docx. If you need it as .doc for an older system, open it in Word, choose "Save As," and select ".doc" from the format list.
Can I edit a .docx file on my phone?
Yes. Download the free Microsoft Word app, Google Docs app, or another word processor app on your phone, then open the .docx file from your email, cloud storage, or file manager. You can edit and save changes directly from your phone.
What happens if I email a .docx file to someone?
They can open it in Word, Google Docs, or another program that supports .docx. The file will arrive with all formatting, images, and text intact. If they do not have a word processor installed, they can upload it to Google Drive or another cloud service to open it for free.