This article is to assist users in optimizing MMS messages for the best user experience.

Static Images:

  • It is recommended that image files be under 850k. In general, the larger the file, the longer the delay in message delivery. Messages over 2mb will not be sent. 
  • Optimal image size is 1080w x 1920h. Do not place any important content above 218 pixels at the top or 150 pixels at the bottom, as it will be lost in the preview delivery. Alternately, images can be sent at 640w x 1138h, with nothing above 129 pixels or below 89 pixels.
  • Images are best if sent as JPG files. PNG files are also supported.
  • If the message contains dynamic content, then the overall image should not exceed 200k.

Animated Files:

  • GIF is the only format supported.
  • Recommended file size for delivery is under 850k. 
  • Recommended dimensions: 480w x 320h, 320w x 480h, 480w x 480w,  or 320w x 320h
  • In general, it is difficult to ensure a optimized user experience across multiple platforms delivering gifs, and should be used sparingly.

Links and Link Preview:

Links can be used in the body of MMS messages. This guide has the most up to date information on link previews on Android an iOS devices.

If a phone does not support MMS:

If a user’s phone does not support MMS or does not support the format of delivery, the user will be sent a link that will open the message in a separate window.

Additional Information:

  • If sending a text that contains special characters or a message that exceeds the 160 character count with SMS messages, MMS can be used to send messages up to 2,000 characters.
  • Different devices offer a range of user experiences. It is recommended when sending MMS messages to send test messages to a variety of devices prior to broadcast.
  • Broadcast size, file size, carrier restrictions, and signal strength may all be factors in message delivery.
  • Additional questions about optimizing MMS messages can be directed to a Strategy Representative or by contacting Support at