Open the PNG file in an image editor or viewer
Select Save As or Export
Choose JPG or JPEG as the file format
Adjust quality settings if prompted
Save the file with a new name or location
Use an online PNG to JPG converter if needed
On Windows, open the image in Paint and save it as JPEG
On Mac, open the image in Preview and export it as JPEG
On mobile, use a photo editor or converter app to save as JPG