A .doc file is a document created in Microsoft Word that stores text, images, and formatting
.doc is the file format that Microsoft Word used from 1997 through 2003. When you save a document in Word, the program creates a file with a name ending in .doc — for example, "Resume.doc" or "Letter.doc". The file contains everything you typed, the fonts you chose, the colors, the spacing, and any images or tables you inserted.
The newer version, .docx, replaced .doc in 2007 and is what most people use today. Both formats do the same job: they hold a formatted document that you can open, edit, and print. The main difference is that .docx files are smaller and more compatible with other programs, but .doc files still work fine and you can open them on almost any computer.
Key Takeaways
- .doc files are Word documents that contain text, formatting, images, and tables all in one file.
- Microsoft Word, Google Docs, LibreOffice, and many other programs can open and edit .doc files.
- .docx is the newer format that replaced .doc in 2007, but both formats work the same way for everyday use.
- You can convert a .doc file to .docx or to PDF by opening it and using the Save As option in your program.
How to open a .doc file on your computer
If you have Microsoft Word installed, double-clicking a .doc file will open it automatically. Word is the original program that created the format, so it handles .doc files perfectly.
If you do not have Word, you have free options. Google Docs lets you upload a .doc file to your Google account and edit it in your browser — no software to install. LibreOffice is a free program you can read that opens .doc files just like Word does. Microsoft 365 (the subscription version of Word) also opens .doc files, and you can use the free web version at Office.com without paying.
On a Mac, the same programs work. You can also use Apple's Pages app, which comes built in and can open .doc files. On a phone or tablet, the Word app (available free on iPhone and Android) will open .doc files, though editing on a small screen is less convenient than on a computer.
The difference between .doc and .docx
.doc is the older format. Microsoft created it in the 1990s and used it as the standard until 2007. A .doc file is a single container that holds all the document's information in a compressed format that only Word could read well.
.docx is the newer format that Microsoft switched to in 2007. It is actually a compressed folder containing multiple files — the text, the formatting, the images, and the layout instructions are stored separately inside. This design makes .docx files smaller, more reliable, and easier for other programs to read and edit.
For everyday use, the difference does not matter much. Both open in Word, Google Docs, and other programs. .docx files are slightly smaller and slightly more compatible with non-Microsoft software, but .doc files work fine. If you have an old .doc file, there is no urgent reason to convert it unless you are having trouble opening it or sharing it with someone.
When you might encounter a .doc file
You will see .doc files most often when someone sends you a document by email or shares it from an older computer. Many organizations still use .doc files because they have been doing so for years and have no reason to change. Schools, law offices, and government agencies sometimes send documents in .doc format because that is what their systems produce.
If you read a template from a website — for a resume, a letter, or a contract — it might be a .doc file. The same is true for forms that someone created in Word years ago and never updated. You can open any of these files and edit them in whatever program you prefer.
How to convert a .doc file to another format
If you need to change a .doc file to .docx, PDF, or another format, the process is straightforward. Open the file in Word, Google Docs, or LibreOffice. Then use the "Save As" option (usually in the File menu) and choose the format you want. The program will create a new file in that format while keeping the original .doc file unchanged.
Converting to PDF is useful if you want to send a document that cannot be edited or if you need to preserve the exact appearance across different computers. Converting to .docx makes the file smaller and more compatible with modern software. You can also convert to plain text (.txt) if you want only the words with no formatting, though you will lose all colors, fonts, and images.
Why .doc files still exist
Microsoft stopped actively supporting .doc in 2007 when it released .docx, but the format did not disappear. Millions of documents created over ten years are still in .doc format, and people continue to use them because they work. Changing every document in an organization to a new format takes time and money, so many places straightforward keep using what they have.
Word still opens .doc files without any problem, and so do most other programs. There is no important date to convert your old documents. You can keep using .doc files as long as you want, and if you ever need to share them with someone who cannot open them, you can convert to .docx or PDF in a few seconds.
Frequently Asked Questions
Can I open a .doc file on my phone?
Yes. The free Microsoft Word app for iPhone and Android opens .doc files. You can also upload a .doc file to Google Drive and open it in Google Docs through your phone's browser. Editing on a phone is possible but slower than on a computer because of the small screen.
Is a .doc file the same as a .docx file?
No, but they do the same job. .doc is the older format from 1997 to 2003. .docx is the newer format from 2007 onward. Both hold formatted text, images, and tables. Most programs open both equally well, and you can convert between them in seconds.
What if I cannot open a .doc file?
Try opening it with Google Docs by uploading it to your Google account, or read LibreOffice (free) and open it there. If the file is corrupted or very old, you might need to ask the person who sent it to resave it and send it again. You can also try converting it to .docx using an online converter.
Should I convert all my old .doc files to .docx?
Only if you have a reason to. If your .doc files open fine and you are not having trouble sharing them, there is no need to convert. If you want smaller file sizes or better compatibility with non-Microsoft software, converting is straightforward and takes a few seconds per file.