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Standard Email Header and Email Footer
Microsoft was the leading company of the email client Outlook, and email width rule of 600 pixels was born since that time and it has largely succeeded.
The standard size for email header and email signature banner is 600 x 200 pixels, and standard size for email footer is 600 x 100 pixels, the file size must be less than 1MB to avoid slow loading in subscriber inbox.
Regarding email header and footer file format, JPG and PNG format are the most common formats used in email headers and email signature banner.
Email Header and Footer for High Definition Screens
To make sure that your email header and footer appear clear on all high definition screens such as smartphones, tablets, and laptops, it is recommended using larger size email headers such as 1200 x 400 pixels or 900 x 300 pixels, it is recommended using larger size email footers such as 1200 x 200 pixels or 900 x 150 pixels, be sure to set the constraint header and footer size By 50% or 66.66% accordingly with your email clients.