What size should email header images be?
Email headers should be 600 pixels wide (the standard email body width). Height varies from 150-300 pixels. 600×200 is a common choice that works across email clients.
What format is best for email images?
Use JPG for photos and PNG for graphics with text. Keep file size under 200KB for fast loading. Many email clients block large images by default.
Will my email header look the same in all clients?
Most modern email clients display 600px-wide images correctly. Outlook may scale differently. Always test in major clients (Gmail, Outlook, Apple Mail) before sending.
