Recommended File Size for Static MMS Images
No Transcoding: We recommend keeping static MMS images files under 740Kb.
Sinch Transcoding: We recommend keeping static MMS images files under 1Mb.
Recommended Images Dimension for Static MMS Images
The optimal image size across all devices has an aspect ratio of 9:16.
We recommend 640px by 1138px or 1080px by 1920px.
Image Design Considerations for Static MMS Images
When an MMS image is delivered to a phone there are typically two ways the content is displayed. The content is displayed in the message conversation thread within a message bubble and then when the image bubble is tapped, the content is displayed in a full screen view. When the image is displayed within a message bubble, there are portions of the image cut off from view. It is therefore important that any image be designed with the “content of interest” within a more restricted areas of the image so that it is readable from within the conversation view.
For Images 640px by 1138px: Avoid adding content of interest on the top 129px and the bottom 89px.
For Images 1080px by 1920px: Avoid adding content of interest on the top 219px and the bottom 150px
Additional best practices for Static MMS Images