Mailchimp Campaign Image Resizer

What matters

Mailchimp Campaign Image dimensions at a glance

Mailchimp campaign images at 564×564 fit within the padded content area of standard email templates. The aspect ratio is flexible — square is a safe default, but you can adjust height to suit the content.

In-body images break up text and drive engagement in email campaigns. Correctly sized images avoid the scaling artifacts that make emails look unprofessional across different email clients.

Images wider than the template cause horizontal scrolling on mobile. Large file sizes slow loading and increase the chance of images being blocked by email clients or flagged as spam.

Best practices

Use the crop intentionally

• Optimize aggressively for file size — aim for under 200KB per image for reliable loading.
• Always set alt text for when images are blocked by the recipient's email client.
• Test rendering in major email clients (Gmail, Outlook, Apple Mail) before sending.