Content-to-image ratio is a rough heuristic about how much text vs images an email contains. Learn how it impacts readability and filtering.
Content-to-image ratio describes how much readable text an email includes compared to images. Image-only emails can look suspicious and are harder to index or understand for filters and recipients.
While it’s not a strict rule, balanced emails with clear text context tend to perform better. Always include alt text and a plain-text version for accessibility.