Every photo can be improved to make it and your site more appealing. If you aren’t interested in using heavy duty photo editing software like Lightroom, Photoshop or GIMP, check out the free online photo editing options below.
Fotor is a free and easy cross-platform photo editor. I would recommend it for simple edits to your photos. The 1-Tap Enhance feature does a good job of quickly brightening and sharpening photos.
If you want finer control over your photo, Pixlr will give you that. As with desktop photo editors like Photoshop and Gimp, you can edit the levels, add layers, add vignette and more.
PicMonkey has all of the features of the other two options with the added bonus of applying effects like you would in Instagram. It is user friendly and produces great results.