The best email banner size is 650 pixels wide and between 90 and 150 pixels high. This ensures that your email banner will be easily viewable (but not obstructive) in any preview pane or smartphone.
This size focuses you to use a clear, concise headline and simple eye-catching imagery. Don’t overcrowd your banner with too much text.
With Rocketseed a banner can be displayed at the top or bottom of your email and the correct dimensions create impact without overwhelming the recipient.
We suggest image width are a maximum of 650px because that will fit the entire image onto one page width if the email is printed.
The correct email banner dimensions ensure that your email banner will be easily viewable in any preview pane or smartphone.
Email banners should be created as .PNG files and should be designed to a web resolution of 72dpi to display correctly on 100% zoom view.
The email banner image file should be no larger than 45kb to ensure the additional ‘weight’ of the email is kept minimal.
Use GIF files to add animation to your email signature banner. For best performance, keep your banner GIF file size below 45kb by limiting the number of frames. We recommend 2-3 frames with 2-3 seconds between them and image resolution to 72dpi.
Simple animation such as changing product images or colour choices draws attention to your message.
Some email clients do not support animation and will display the GIF as a still image. Therefore feature your most important message on the first GIF frame so, even without animation, recipients will get your main message.
We recommend that if you’re planning to use an animated .GIF that this only has one clickable link, and does not use image maps at the same time.