What is the best header image size for Vyper contests? Permanently deleted user May 13, 2019 06:09 Updated We recommend a size over 1280px x 620px (width x height). Related articles Why are my emails not showing up in Klaviyo? Testing the embedded form, but get a blank white page when signing up. How do I integrate with Zapier? Which mailing list providers do you integrate with? Comments 0 comments Please sign in to leave a comment.