Mailchimp Email Header Resizer

What matters

Mailchimp Email Header dimensions at a glance

Mailchimp email headers at 600×200 span the full width of the standard email template. They set the visual tone for the email and are often the first image recipients see when they open the message.

Email headers establish brand identity and set expectations for the content below. A well-designed header at the correct width prevents awkward scaling issues across email clients.

Oversized headers cause slow loading and may trigger spam filters in some email clients. Wrong widths get scaled by the email client, creating blurry or distorted results, especially in Outlook.

Best practices

Use the crop intentionally

• Keep file size under 200KB for fast loading — many recipients are on mobile connections.
• Design for image-blocked viewing — include alt text and don't put critical information only in the image.
• Use 600px width to match Mailchimp's standard template width and avoid client-side scaling.