Sometimes when you download JPEG or PNG files on a Mac, they may appear as PDF files instead. This usually happens because of how your Mac is set to open certain file types.

If your Mac is using Preview (a built-in PDF viewer) as the default app for these image files, it may cause confusion when saving or opening them.

How to Change the Default App for JPEG or PNG Files

1. Find a JPEG or PNG file on your Mac.

2. Right-click (or Control + click) on the file and select Get Info.

3. In the window that opens, find the Open with section.

4. Choose a different image viewer or editor (like Photos, Preview, or a third-party app).

5. Click Change All to apply this setting to all files of the same type.

Once updated, your Mac should handle JPEG and PNG files correctly when you download or open them.