File sizes should be no larger than 1MB in size. If you are trying to load images that are larger than this you may see an error that reads "413 Request Entity Too Large" appear in your web browser.
See specific dimensions from within your Kindful account by going to Settings > General Settings.
Marquee images on Campaign donation pages: 630px x 380px.
Background images on Campaign donation pages: 1920px x 380px.
Individual Cause Headers:
Recommended images are ones that are 1440px x 760px with the important imagery near the top 400px. Most of the image will be shown, but as it scales, it will mask from the top.
Cause Index Header Image:
Recommended images are ones that are 1440px x 760px, keeping all text within the vertically centered 250px. Only the middle 300px will be visible, but depending on the width of the browser, more or less of the height will be shown.
Header Image: 1170 px x 211px
Sidebar Image: 570px x 320px