I have included a number of free online image editing tools in past eMagazines. Some are good for basic tasks like adding text, effects, shapes etc., and some have more advanced functions geared towards heavy users.

ResizeYourImage is a simple picture cropper which lets users easily crop images online.

• Upload an image,
  
  • Supported image formats: JPG, GIF, PNG, TIFF.
• select the area using the arrow controls (click-n-drag to change the width/height)
  • Width and height of the cropped area is instantly shown on the buttons.
• click “resize your image” button.
• Once cropped users can download it to the computer.

Note: It is Free with no sign up.

Try it out at http://www.resizeyourimage.com/.

The resulting images will have a smaller file sizes.