With the Files App (iOS 16 Only)
How to Change a File Extension When It Is Not Displayed
By default, iOS does not display the file extensions for the most common file types like JPEG, PNG, AVI, MP4 and DOC, so when you try to rename them, you can only change the file name but not the extension. To fix this and to change the file extension of such files, you need to change a few settings. You should see all files with their extensions.
Using Third-Party Software
We recommend using iFiles for simplicity, but you can use alternatives, such as File Master or My File Organizer.
Using an Online File Converter
Use this method only if your files and documents are not confidential. If you’re looking for alternatives to FreeConvert, try one of the following websites:
ZamzarTinyWowSmallpdfConvertioConvertFiles
Image credit: dimarik16 via 123rf All screenshots by Ojash Yadav Even with a compatible file extension, expect to see a few errors occasionally if you simply rename the extension. Your best bet is to use a file converter for flawless conversion.