Image Resources and Tools
What is the best size for images and is there any free tools to use?
Recommended Image Sizing
Featured images or other instances of full-screen-width images should be no larger than 1920px wide. Images that are added within content containers can be 1500px wide or smaller. It is also highly recommended that images are compressed before uploading to the media manager. This helps to ensure fast page loading times. TinyPNG.com allows you to easily upload and compress images - see below for more useful tools.