Software to edit images for the web
Pixlr, an online image editor.
On Mac, you can use Image Tricks to edit your pictures.
InfranView is an image editor for Windows
Customers often ask me how they need to edit their images before they upload them to their site. The Content Management System already solves a lot of problems here. Sometimes, however, you want to choose exactly how the image will be cropped. Or maybe you want to do some basic color correction. When you are really interested in photo editing you can always use Photoshop or Gimp.
There are easier programs for occasional image editing, however.
On Windows, InfranView is a good option. it doesn’t have thousands of features, but it is easy to crop an image, change it’s size or do other corrections
Image Tricks does more or less the same on Mac.
Another alternative is Pixlr. This online image editor is very easy to use and has everything you need.
Are these programs not what you are looking for? Sure, there are hundreds of other options, but the three applications featured here are basically all you need to get your images ready for the web.