Renaming a file extension in Windows 10 changes the filename, but it does not convert the file’s underlying format. To create a genuinely different file type, open the file in an application that supports the desired format and use Save As, Export, or a proper conversion tool.
Show file extensions
- Open File Explorer.
- Open the View controls.
- Enable File name extensions.
- Windows will display extensions such as .txt, .jpg, .pdf, and .docx.
Rename an extension only when the formats are compatible
You can rename a filename and its extension, but doing so does not transform its contents. Renaming photo.jpg to photo.png, for example, does not convert JPEG image data into PNG data and can prevent software from opening the file correctly.
Convert with the application instead
Open the source file in a trusted application and look for Save As or Export. Choose the required format and save a new copy so the original remains available if the conversion changes quality, formatting, or features.
Be cautious with executable extensions
Visible extensions also help identify potentially dangerous files. Do not change or run unfamiliar executable or script files merely to make them open.
Windows 10 normal support ended October 14, 2025.
Matt Jacobs has been working as an IT consultant for small businesses since receiving his Master’s degree in 2003. While he still does some consulting work, his primary focus now is on creating technology support content for SupportYourTech.com.
His work can be found on many websites and focuses on topics such as Microsoft Office, Apple devices, Android devices, Photoshop, and more.