FastStone Image Viewer is not available for Mac but there are plenty of alternatives that runs on macOS with similar functionality. The best Mac alternative is XnView MP. It's not free, so if you're looking for a free alternative, you could try Photoscape or qView. If that doesn't suit you, our users have ranked more than 100 alternatives to FastStone Image Viewer and many of them is available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to FastStone Image Viewer are ACDSee Photo Studio (Paid), Adobe Bridge (Free), Apple Photos (Free) and gThumb (Free, Open Source).
Bridge CC gives you centralized access to all the files and assets you need for your creative projects. Organize personal and team assets, batch edit with ease, add watermarks, set centralized color preferences, and even upload your photos to Adobe Stock.
gThumb is an image viewer and browser for the GNOME Desktop. Features Image Viewer * View single images (including GIF animations). Supported image types are: BMP, JPEG, GIF, PNG, TIFF, ICO, XPM. * View EXIF data attached to JPEG images.
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gThumb vs FastStone Image Viewer opinions
Some users think gThumb is a great alternative to FastStone Image Viewer, some don't.