Knowledge of editing photo, photo editor software,
photo retouching, photo design & Photoshop
Recommend 5 Online Image Editing Web Site

Lots of image editing applications , some focus on resizing, some on image editing, and others on photo enhancements. Below is the list of online image editors you may use to editing photos online without any software installation. It has nice interface and rich choice of image manipulation (and resizing) features some of them also give you an option to:

upload and save image on one of the free photo storage services, import images from your photo sharing.

(1) Fotoflexer

FotoFlexer