Images, GIFs, & Media

Using visuals without sinking your deliverability. This section explains how to use images, the importance of ALT text (for accessibility), and why you must maintain a healthy text-to-image ratio to avoid spam filters.

19 questions in this topic

Should I use images in emails? What image formats are best for email (JPG, PNG, GIF, SVG)? What is ALT text and why is it important? How to use ALT text for accessibility and fallback? How can I optimize images for email loading speed? Can I use animated GIFs in emails? Can I embed videos in emails? What is base64 encoding and when is it bad for deliverability? What’s the max recommended total weight for an email? How do CDNs serve images securely (HTTPS, caching)? What are “linked” vs “embedded” images? How do animated GIFs affect performance? What are retina/high-DPI image considerations? How does image blocking work in email clients? What happens if an image is blocked by a spam filter? Why should images always include dimensions? How do CID-referenced images work? How does lazy loading affect emails (hint: it doesn’t work)? What is video embedding vs thumbnail linking?

Questions about Images, GIFs, & Media