FastStone Photo Resizer is not available for Mac but there are plenty of alternatives that runs on macOS with similar functionality. The best Mac alternative is ImageMagick, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to FastStone Photo Resizer and 17 are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to FastStone Photo Resizer are Caesium Image Compressor (Free, Open Source), XnConvert (Free Personal), XnResize (Free) and GraphicsMagick (Free, Open Source).
ImageMagick is a software suite to create, edit, and compose bitmap images. It can read, convert and write images in a variety of formats (about 100) including GIF, JPEG, JPEG-2000, PNG, PDF, PhotoCD, TIFF, and DPX.
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Most users think ImageMagick is a great alternative to FastStone Photo Resizer.
Caesium Image Compressor lets you compress your pictures up to 90% without visible quality loss. Providing a simple yet effective interface with a real-time preview and multiple image processing at the same time, everyone will be able to reach the best result.
XnConvert is an easy image converter for graphic files, photos and images available on Windows, MacOSX and Linux. It supports more than 400 file formats (jpeg, tiff, png, gif, camera raw, jpeg2000, WebP, OpenEXR, ...).
XnResize is a fast, powerful and free cross-platform image resizer. All common picture and graphic formats are supported (JPEG, TIFF, PNG, GIF, WEBP, PSD, JPEG2000, OpenEXR, camera RAW, HEIC, PDF, DNG, CR2).
With Filestar you can "do anything with any file". Get rid of repetitive tasks, save time and boost your productivity with over 30.000 file conversions available. Transform or convert hundreds of files, all at the same time with a few simple clicks.
PhotoBulk is easy-to-use bulk image editor that lets you add text/image watermark, resize, and optimize hundreds and thousands of images or photos in just one click. Just drag and drop your images onto the app, choose desired actions and press start button. Voila!