There's a free Chrome web app called Pixlr Editor from Autodesk which works very well. It has layers and filters like Paint.Net, etc., and you can crop and resize very easily. Even better, you can open an image from a URL, so you can pull in an image that you find on the web very easily. To make it doubly useful I've installed an extension to Chrome called Pixlr Grabber . This is available from the top right of my browser at all times. I can select any image on the web, or a screen capture of a selected area, and open it immediately in Pixlr Editor. Incredibly convenient, and to be honest better than the way I had been doing it before. (Saving images to disk first, then opening in Paint.Net and editing them.) You could try both these out in Chrome on a Windows machine if you like. Not as powerful as Photoshop of course, but certainly powerful enough to manipulate images and tokens for Roll20. I'm not suggesting ChromeOS devices are suitable as your only machine (yet). I have a fast Windows 7 box which I need to boot up if I want to use something like Campaign Cartographer. But as a second machine, and particularly as a light, silent, laptop with good battery life that supplements your main desktop, the ARM Chromebooks are really, really nice. The Haswell ones coming out soon will have fans (which the ARM ones don't) so they won't be completely silent, but they should have even longer battery life and about twice the processing power.