PicMonkey

If you loved Picnik (that has shut down), PicMonkey is great replacement tool. It's faster, more powerful, and easy to use.  The terms of use require you to be at least 13 years of age and a human! There is no log in required to edit images and there are so many tools to use.  I found myself spending over an hour just looking at all the editing features.  Not only can you edit the image, but you can add text, clip art, frames and more.
Here is an example of an image I edited in PicMonkey... You need to see what PicMonkey has to offer.