I often use this great tool to do some quick changes on images, resize or mix files, etc. Then, I thought it would be nice to post here something about it.
Pixlr, at https://pixlr.com is a tool very similar to PhotoShop, but running on your browser (an online PhotoShop), and is also for free.
If you are used to the PhotoShop tools you can use it. It opens really faster, then you will not need to open the PhotoShop itself to make some little changes to a simple image. Plus, it has a firefox addon with which you can do a lot of things more.
It is, definitely worth it, to take some time to test it.
Of course, there are many features more in your PhotoShop, even thought, its a great, great option. I use it a lot by myself.