First, open the image in the Preview app. Then, go to File > Export. Here, choose JPEG as the format and click Save. This will create a new file in the same folder as the original image.

A JPEG is one of the most widely used file formats for a digital photograph. The file format’s widespread popularity means the file can be opened by nearly any device and thousands, if not ...

If nothing has worked so far, you can try saving your file in a different format and then converting it to JPEG on your computer. I recommend using TIFF, but these steps also worked for me when I ...