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Practical guides for online sellers: product photos, marketplace listings, video ads and growing your store.

Email Header Image Size (2026): Width, Retina, File Size for Mailchimp and Klaviyo

Seller Guides Oct 20, 2026

Email Header Image Size (2026): Width, Retina, File Size for Mailchimp and Klaviyo

The right width for a newsletter header, what Mailchimp and Klaviyo's docs actually recommend, the retina 2x rule, file sizes, heights and a layout that works in every inbox.

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