Canva is the revolutionary platform that makes creating nicely designed images as easy as can be, and all in a beautiful online interface. No need for downloaded software programs like Photoshop or Sketch.
It also has zero learning curve and a ton of free stock images and icons for you to add to your designs and style as needed.
Stencil lets you add text to any image from anywhere on the web.
Very similar to Canva, but the preference of some bloggers for its speed. The free version is more limited however, as you can only create 10 free images and a limit on the number of backgrounds and images that you can use.