Google and Picasa

You can edit photos online with Flickr and Photobucket that I use but I suspect most photo library websites have adequate tools to do basic editing. Editing on the digital camera is difficult because the tools are clunky and the LCD screens on most are not the greatest to judge results. Smartphone cameras and tablets are better because their screens are a lot better and there are a wealth of apps you can use. But the best editing comes on a computer. On my MacBook Pro with Retina display I rarely have to go much beyond just using the Apple software iPhoto to fix and improve a photo.