Phatch is described as 'User friendly, cross-platform Photo Batch Processor and Exif Renamer with a nice graphical user interface. Phatch handles all popular image formats and can duplicate (sub)folder hierarchies' and is an app in the file management category. There are more than 50 alternatives to Phatch for a variety of platforms, including Windows, Mac, Linux, Web-based and Android apps. The best Phatch alternative is XnView MP. It's not free, so if you're looking for a free alternative, you could try XnView MP or Image Toolbox. Other great apps like Phatch are XnView Classic, Caesium Image Compressor, XnConvert and ImageOptim.
Converseen is a free cross-platform batch image processor for Windows and Linux that allows you to convert, resize, rotate and flip an infinite number of images with a mouse click.
Italy
EU
QuickViewer is a graphic image viewer for comfortable browsing of many images. This software performs reading of image data in advance. And drawing the imported image data on the screen with OpenGL. You can browse images with much smoother response than ever before.
Japan
Universal Viewer is an advanced file viewer for wide range of formats. Supported file formats are:
Russia
Create email-friendly images, resize in batches, convert formats, and compress using high-quality filters. Integrated in Windows Explorer, it offers high-res settings, watermarking, a profiles library, PDF creation, and supports devices like iPad and iPhone.
FranceEU
RomaniaEU
NX Studio is a computer software that allows users to enjoy the viewing, processing, and editing of still images and video, and provides more intuitive operation.
Japan
Offline batch image resizer & converter for Windows - JPEG, HEIC, RAW, WebP and 70+ formats, all CPU cores, one-time license, no upload.
United States
Image Tuner is a free batch image resizing, renaming, conversion and watermarking software with a super-intuitive and straightforward interface.
Russia
MAZANOKE is a simple image compressor and converter that runs entirely in your browser. No external uploads, works offline as a web app, and is powered by Browser Image Compression.
GraphicsMagick is the swiss army knife of image processing. Comprised of 282K physical lines (according to David A. Wheelers SLOCCount) of source code in the base package (or 952K including 3rd party libraries) it provides a robust and efficient collection of tools and libraries...
pngquant is a command-line utility and a library for lossy compression of PNG images.
Poland