To change a file type on Windows, open the file in a compatible app, select Save As or Export, and choose the new format. If you only need to correct an incorrect filename extension, show extensions in File Explorer and press F2 to rename the selected file. Renaming changes the filename without converting its contents, while changing the default app only changes which program opens it.
The File Explorer and Settings steps use Windows 11 menus. Keep an original copy before converting, because conversion can lose formatting, transparency, macros, metadata, or quality.
The short version
- Convert the contents: Choose the destination format through a compatible app’s Save As or Export command.
- Correct an extension: Make filename extensions visible before renaming the part after the final period.
- Change the opening app: Choose a compatible program through the file’s opening options or Windows default app settings.
- Keep the original: Save converted files under a new name so you can return to the original if the result loses something you need.
| Your task | Method | Result |
|---|---|---|
| Correct an incorrect extension | File Explorer and F2 | Renamed file with unchanged contents |
| Convert a picture | Paint Save as | New image format |
| Convert an Office file | Office Save As | New document format |
| Export a Word document as PDF | Word Export | PDF copy |
| Make a PDF editable in Word | Word Open and Save As | Word document with possible layout changes |
| Create a PDF from printable content | Microsoft Print to PDF | PDF of the printed content |
| Convert audio or video | VLC Convert/Save | New media file |
| Correct multiple extensions | PowerToys PowerRename | Renamed files with unchanged contents |
| Choose an app from a file | Open with | One-time or default opening app |
| Choose an app by extension | Windows Default apps | Default opening app for that extension |
Show and rename the file extension
Use renaming when the file already contains the correct data but has the wrong extension, such as a plain-text file incorrectly named report.text instead of report.txt. Press Windows + E to open File Explorer, then select View > Show > File name extensions. This makes the extension visible without changing the file.
Select the file and press F2, or right-click it and select Rename. Replace the extension after the final period, keeping the rest of the filename, then press Enter. You need permission to rename the file.
This is an extension correction, not a format conversion. For example, replacing .png with .jpg leaves the original image contents unchanged. To turn a PNG into a JPEG, choose JPEG as the output format in a compatible image app.
Convert a picture in Paint
For an image that current Paint on Windows 11 can open, select File > Open in Paint and choose the picture. Select File > Save as, then choose an offered format, such as JPEG, PNG, or BMP. Enter a new filename, choose a location, and select Save.
Choose the output format from the menu rather than just typing a different extension into the filename. Paint supports PNG, JPEG, BMP, and GIF output, but the available choices depend on format support. If Paint cannot open the source or does not offer your destination format, use an image application that supports that conversion.
Save documents in another format
In Word, Excel, or PowerPoint for Microsoft 365 or Office 2024 on Windows, open the file and select File > Save As, or Save a Copy where offered. Choose This PC or Browse, enter a new name in File name, and select the destination format in Save as type. Select Save to create the converted copy.
Pressing F12 provides another route to Save As in these Office apps. Available formats depend on the application, so choose from its format list. If the converted copy loses formatting or features you need, return to the original and choose another suitable format.
To create a PDF in desktop Word, select File > Export > Create PDF/XPS Document > Create PDF/XPS. Choose the filename and destination, then select Publish. You can also follow the dedicated steps to save a Word document as PDF.
To convert a PDF into an editable document in Word for Microsoft 365 or Word 2024, select File > Open > Browse and open the PDF. Select OK at the conversion notification, then use File > Save As, choose Word Document, and save the converted file. This works best with mostly textual PDFs, and the layout can change.
Create a PDF from printable content
On Windows 11 or Windows 10 with Microsoft Print to PDF installed, open the file in an application that can print it and press Ctrl + P. Choose Microsoft Print to PDF as the printer, then select Print. In Save Print Output As, enter a name in File name, choose a location, and select Save.
This method requires an application that can open and print the original content. If your current app cannot do that, open the file in a compatible application first. For Office documents, you can also use the application’s PDF export option.
Convert audio or video with VLC
If you need to install VLC, get it from the official VLC for Windows download page. In VLC 3.0 for Windows, select Media > Convert/Save > Add. Select your source file and choose Open. If VLC returns you to the Open media dialog instead of opening the Convert dialog, select Convert/Save there.
Choose an output Profile, then enter a new path and filename in Destination file with an extension matching that profile. Select Start to begin conversion. The profile determines the conversion, so changing only the destination extension is not enough.
Conversion depends on VLC’s available input decoders and output profiles. If it cannot handle the source or does not offer the output you need, use a converter that supports that format pair. Keep the original media because conversion can affect quality.
Change several file extensions together
For multiple extension corrections, PowerToys PowerRename lets you review the proposed names before applying them. Get PowerToys through Microsoft’s official PowerToys product page and its Install PowerToys link, then enable PowerRename. Select the files in File Explorer, right-click, and select Rename with PowerRename, using Show more options if necessary.
Under Apply to, choose Extension only. Enter the old extension without its period in Search for, and enter the replacement in Replace with. Review the Renamed preview, then select Apply.
Each selected file should already contain data appropriate for the replacement extension. PowerRename changes filenames without converting their contents. To convert a folder of pictures or documents, you need an application that performs the required format conversion.
Choose which app opens the file type
On Windows 11, right-click the file and select Open with > Choose another app. Choose a compatible app, then select Always to make it the default or Just once for this opening.
To choose by extension on Windows 11, open Settings > Apps > Default apps. Under Set a default for a file type or link type, enter an extension such as .pdf and select its result. Choose an installed compatible app from the options provided. This changes the file association while keeping the file’s existing format.
Fix a file that will not open after renaming
If a file stops opening after you change its extension, restore the original extension first. Renaming has not supplied the contents required by the new format. Open the restored file in a compatible app, then choose the destination format through Save As or Export.
If you only wanted another program to open the file, keep its correct extension and change the opening app instead. Choose a program that supports the file’s actual format. Switching apps does not convert the contents either.
Frequently Asked Questions
How do you save a Notepad file without adding a .txt extension?
In Notepad on Windows 11 or Windows 10, open the text, select File > Save as, and set Save as type to All files (*.*). Enter the complete name and intended extension in File name, such as settings.ini, then select Save. The text must already contain the syntax required by the destination format.
Can LibreOffice change document formats on Windows?
Yes, current LibreOffice for Windows can save supported documents in the formats offered by its component. Open the document, select File > Save As, choose the destination format in File type, enter a name in File name, and select Save. Writer, Calc, and Impress offer different format lists.
Does making a ZIP file convert the files inside it?
No, a ZIP archive packages files while leaving their internal formats unchanged. Extracting the archive returns the contained files without converting them to another document, image, or media format.
Can Word use a different format for future saves?
Yes, in Word for Microsoft 365 or Word 2024 on Windows, select File > Options > Save. Under Save documents, choose the required format in Save files in this format, then select OK. This changes future saves rather than batch-converting existing documents.