DesignHill Image Resizer - Use designhill's free online optimized image resizer
Canva - Canva is a graphic-design platform with a drag-and-drop interface to create print or visual content while providing templates, images, and fonts. Canva makes graphic design more straightforward and accessible regardless of skill level.
ResizePixel - Free image editor to crop, resize, flip, rotate and convert images online
PicMonkey - PicMonkey is a feature-rich online photo editor that works right in your browser; no downloads...
Crello - A simplified graphic design tool with 10,000 free templates.
Piktochart - Piktochart for Business Storytelling