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.
Shrink Me - Compress images with one drag / click
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
TinyJPG - Compress JPEG images with perfect quality and file size
Ralpha Image Resizer - High-speed image batch conversion tool
Watermark.ink - Online Photo Watermarker
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.