How to Change File Extension in Windows 10 (Step-by-Step Guide)

Changing a file extension in Windows 10 is simple once you enable file name extensions. In this step-by-step guide, you will learn how to show file extensions and safely rename them.

Why Change File Extensions?

You may need to change a file extension when:

• Converting .txt to .html for web development
• Creating script files like .bat
• Fixing incorrect file types
• Testing how different file formats behave

By default, Windows 10 hides file extensions, which makes file management harder.

Step 1: Enable File Name Extensions in Windows 10

Before changing a file extension, you must make them visible.

1. Open File Explorer (Press Windows + E)
2. Click the View tab at the top
3. Check the box File name extensions

After enabling this option, you will see extensions like .txt, .html, .jpg, etc.

Step 2: Rename the File Extension

Now that extensions are visible:

1. Right-click the file
2. Click Rename
3. Change the extension

Example:
test.txt → test.html

4. Press Enter

Step 3: Confirm the Warning Message

When you change the extension, Windows will show a warning message:

If you change a file name extension, the file might become unusable.

Click Yes if you are sure.

Important: Changing Extension vs Converting File

Changing the file extension does not convert the file format.

For example:

• Renaming .mp4 to .mp3 does not convert video into audio.
• Renaming .txt to .pdf does not create a real PDF file.

If you need to convert files, use proper file conversion software.

Conclusion

Now you know how to change file extension in Windows 10 step-by-step. By enabling file name extensions and renaming files correctly, you can manage your files more efficiently.

This small setting makes a big difference, especially for beginners, students, and developers.