ResizePixel is a free online image editor where simplicity is essential feature. It is designed to crop, resize, flip, rotate and convert images to various formats. The service is mobile-friendly, fast and easy to use.
MakeAppIcon - MakeAppIcon resizes and optimizes your icon designs into all formats needed for iOS and Android mobile app!
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
App Icon Generator - Generate icons and images for mobile apps, android and iOS. No need to upload or download. Works on your browser
Ralpha Image Resizer - High-speed image batch conversion tool
EasyAppIcon - EasyAppIcon helps you to create your own app icons easily. Supporting Android Adaptive Icon!
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.