I highly recommend PicMonkey!!! :) (by julieannelarson)
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I've been using the paid version of PicMonkey for a few years and highly recommend it. They do have a free version as well.
PicMonkey makes it easy to crop, resize, add text, frame and "decorate" your photos. There are a whole lot more cool features available that I haven't mentioned.
Using PicMonkey for your business will definitely add a touch of professionalism to your marketing materials!