On top of its basic image viewing capabilities, Pixea also allows users to edit photos by rotating, flipping, displaying EXIF data, and more. Here, you can view virtually any image file format, including HEIC, JPEG, PNG, GIF, PSD, RAW, and so on. Pixea is a beautiful image viewing app for macOS, thanks to its minimalistic and modern UI. So, without wasting much time, here are the best macOS photo viewer apps to download in 2021. Although you can easily view pictures using the in-built Preview app, the previews might not be big enough for you to determine which photos have the best quality. If you're stuck in the same conundrum trying to look for the best photo viewer for Mac, this article is tailor-made for you. 'What is the best image viewer for OS X that performs like the Windows built-in image viewer, so that one can go through images using the arrow keys or display a slide show?' -Question from Quora 4.15 10 Easy Way Do Split-Screen on Mac.