---title: Messaging MIME Typesslug: /guides/messaging-mime-typessidebar_position: 5x-custom: ported_from_readme: true---To send MMS, you must include a media attachment. The content-type header must have an accepted content type, or SignalWire will have to reject the request. Media Size Limits-----------------The overall size limit is 1.2MB for local numbers and 750KB for toll-free numbers. Most carriers support message attachments with a total size of 1MB-1.2MB. However, to maximize deliverability across all carriers, limit your attachment size to 500KB. Accepted MIME Types-------------------All of the following MIME types are accepted. SignalWire will not modify the body content for device compatibility. | Type | Description || :-------------- | :------------------------------------------ || audio/mp4 | mpeg layer 4 audio || audio/mpeg | mpeg layer 3 audio || audio/mpeg3 | mpeg layer 3 audio || audio/ogg | ogg audio || audio/vorbis | audio compression format || audio/vnd.wav | wav format audio || audio/ac3 | codec format audio || audio/amr | codec format audio || audio/midi | musical instrument digital interface format || image/jpeg | jpeg format image || image/gif | graphics interchange format || image/png | portable network graphics format || image/bmp | bitmap image format || text/plain | text file format || text/calendar | text file format || text/vcard | text file format || text/x-vcard | text file format || video/mpeg | mpeg video format || video/mp4 | mpeg layer 4 video format || video/quicktime | quicktime video || video/h264 | video compression format || video/3gp | media container format |
