When it comes to finding the best free photo viewer for Mac in 2020, there are several factors to consider. In this article, we'll explore the top features that make a photo editing app stand out from the rest.

First and foremost, quality filters and presets can make all the difference. The best editing apps provide more attractive filters and presets, giving users a wider range of options to choose from without having to spend hours tweaking each photo. Additionally, retaining individual edit steps and slider positions for each adjustment even after closing and reopening the app is a major plus.

Another crucial feature is powerful edit-history functionality. This means being able to make changes without permanently altering the original image, as well as moving forward and backward through the edit timeline if you change your mind about edits later on. The best apps provide finer granularity without sacrificing usability, making it easy to understand the effects of edits with before-and-after comparisons.

Ease of use is also essential when it comes to photo editing apps. A fluid, easy-to-navigate interface makes it simple to find the settings you need, adjust what needs fixing, and send your finished photos where they need to go. The best apps produce good-looking results and can effectively correct problems in original photos.

While having a lot of adjustments is important, the best apps also offer advanced features like healing brushes, histograms, curves, split toning, layers, masks, correction for chromatic aberration, and more. These additional tools allow users to fine-tune their edits and achieve professional-looking results.

Finally, powerful adjustments and great-looking output are essential for any photo editing app. Most apps offer basic adjustments such as brightness, contrast, and sharpening, but the best ones go above and beyond with advanced features that help users achieve stunning results.

In conclusion, when searching for the best free photo viewer for Mac in 2020, look for apps that offer quality filters and presets, powerful edit-history functionality, ease of use, advanced adjustments, and great-looking output. With these features in mind, you'll be able to find an app that meets your needs and helps you achieve professional-looking results.

Best free photo viewer for mac 2020