The image guide is intended to help you create small-sized image files, that are named in an SEO friendly manner. Not following the guidelines may mean your website becomes bloated, loads slowly (especially for mobile users) and does not get the best indexing on Google search listings.
All images should be saved as:
- 70-80% quality
- RGB color
- JPG Format (only use PNG if transparent background is required)
You can resize images using this handy website http://bulkresizephotos.com
Optionally use http://compress.photos/ to reduce the file size of images that are already the correct size.