Piktochart.com is a free, easy way to make infographics online. 

FAQ:

• Can easily download as PNG or JPEG
• Free version has watermark at bottom
• Add charts, maps, and videos using TOOLS

Pay attention to the license of any images you use in your projects. Remember to look for openly licensed images, and that most images online are under copyright (whether they say so or not).

• OpenClipart.org
• Pixabay.com