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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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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Pixillion
Convert JPG, HEIC, WEBP, PNG, JPEG, PDF, CR2, DNG, and other image formats. Convert images to JPEG, GIF, PNG, PDF, BMP, TIFF, and more. Rotate, resize and compress digital photos. Easily add captions or watermarks to your images. Convert images in a couple of clicks. Update metadata of image files. Crop multiple photos at once to a predefined aspect ratio or custom size. Free version available for non-commercial use. The easy one-click process makes Pixillion perfect for converting your image files and digital photos for posting on the web, emailing to friends, or displaying on your mobile phone. Convert or compress thousands of photos at a time with batch conversion. Preserve vector graphics when converting between vector formats. Resize images, add text captions and watermarks and even convert images from the right-click menu. Preview images before conversion, as well as image file format, compression settings, and dimensions for image resizing.
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PearlMountain Image Converter
Not only a simple image converter but an all-in-one photography program that supports resizing images, photo cropping, rotating, and more in batches. Convert hundreds of images at a time with just a few mouse clicks. Convert images with super high speed, and support for multi-core processing. Both amateur and professional photographers can deal with digital photos easily. Supports the most popular image formats: BMP, JPEG, TIFF, PNG, GIF, TGA, and PSD, and almost all image formats. This batch image converter can convert thousands of files at once in batch mode. Convert multiple image files from different formats to the desired format at one time with a few mouse clicks. Add and customize watermarks to images. Batch rename your images at will. Adjust image brightness, contrast, and saturation in batch to make your images more special. Preview the new image as the setting is adjusted. Provides some parameter adjustments for each format. Free to rotate images.
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