Convert PJPEG to JPEG

Everything points to the fact that PJPEG format is just another variant of common JPEGs with the difference being just the different extension, which means you can try to simply rename the pjpeg suffix to jpeg if you need to. Some programs like Photoshop list this file type as supported and can work with that normally, but that is probably just because it is a normal JPEG, just with different extension. Otherwise we do not know about some converter designed just for the purpose of pjpeg to jpeg conversion.