XnView
XnView MP/Classic is a free Image Viewer to easily open and edit your photo file. The Image Viewer supports all major image formats (JPEG, TIFF, PNG, GIF, WEBP, PSD, JPEG2000, OpenEXR, camera RAW, HEIC, PDF, DNG, CR2). As Image Viewer you have features like color adjusting, image resizer, cropping, screen capture, metadata editing (IPTC, XMP) and much more. With its easy-to-use explorer-like interface, XnView MP allow you to quickly view your images and photos, but also to make image management. You have features like batch rename, batch converter, duplicate image finder, image compare, but you can also create contact sheets, slideshow.
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Picview
Picview is an image viewer for macOS with a nice minimal modern user interface. Picview works great with JPEG, HEIC, PSD, RAW, WEBP, PNG, GIF, and many other formats. Provides basic image processing, including flip and rotate, EXIF, and other information. Supports keyboard shortcuts and trackpad gestures. The most important, Picview like Windows' default picture viewer — Photos, where zoom in and out with the mouse wheel and switch between images with arrow keys and/or with on-screen buttons.
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4K Image Compressor
4K Image Compressor is a free cross-platform app that lets you optimize PNG, JPEG, HEIC, and WEBP images quickly and without quality loss.
With 4K Image Compressor, you can:
Reduce the size of an image by a desired number of percent or to a particular size in megabytes, kilobytes, or even bytes
PNG, JPEG, HEIC, and WEBP are supported for optimization and conversion, and more are coming soon
Batch compression is available to save your time
You can upload images in lossless and lossy formats.
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FastStone Photo Resizer
FastStone Photo Resizer is an image converter and renaming tool that intends to enable users to convert, rename, resize, crop, rotate, change color depth, and add text and watermarks to images in a quick and easy batch mode. Drag and Drop mouse operation is well supported. Convert and Rename images in batch mode. Support common image formats including loading of JPEG, JPEG2000, PNG, GIF, BMP, TIFF, PCX, TGA, WMF, EMF, ICO, CUR, PPM, HEIC, WEBP, and saving to JPEG, JPEG2000, PNG, GIF, BMP, TIFF. Resize, crop, change color depth, apply color effects, and add text, watermark, and border effects. Rename images with sequential numbers. Search and replace texts in the file names. Preview conversion and renaming. Support folder/non-folder structure. Load and save options. Support multithreading. i.e. process multiple images simultaneously for better performance. Improved color accuracy when loading CMYK jpeg images.
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