I need to find a simple way to adjust the aspect ratio of images that are submitted to my company's website. The design of the site is pretty punishing to any images that are not in 16:9. I just use the Photoshop crop tool to do this, but most other users either don't have a key or wouldn't know how to do this. I need to find a simple way to teach to users how to do this.
Can anyone recommend an alternative to Photoshop that has the ability to add margins to achieve a 16:9 aspect ratio?