What MMS message size limits must be adhered to?

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Emma Bradley

Updated

Platform Total message size (including media) External media Stored media Number of Attachments
Local MMS - HTTP 1000 characters (recommended) + 3.5 MB total of all media files per message  3.5 MB 3.5 MB (media) Maximum 10 attachments
Toll-free MMS - HTTP or MM4 1000 characters (recommended) + 525 KB total of all media files per message

HTTP: 525 KB

MM4: n/a

HTTP: 525 KB (media)

MM4: n/a

Maximum 10 attachments

MM4 5MB total MM4 payload n/a n/a  

Note: If you're an HTTP customer, external media means you include a URL and Bandwidth will fetch the content. Stored media means you upload the content to the Bandwidth Application Platform media server. If you're an MM4 customer, you provide the content itself in the message payload. Check out our developer docs to learn more.

Important: Message size doesn't equal media size. Message size includes all the pieces of the message: headers, text, files, etc.

Below are some notes around the various message sizes accepted by US carriers:

AT&T:

  • Message size less than 1 MB will be passed to AT&T without transcoding.
  • Message size larger than 1 MB (up to 3 MB) will be transcoded and resized by the platform to size limit it of 1 MB or lower and deliver it to AT&T.
  • If the message cannot be resized by the transcoder to 1 MB or lower, then the message will be dropped by the platform.

Verizon:

  • Verizon will accept message size up to 1.7MB.
  • No resizing will be performed for messages destined to Verizon.
  • If message size is over 1.7 MB, then the message will be dropped by the platform.

T-Mobile & Sprint

  • T-Mobile will accept message size up to 3 MB.
  • No resizing will be performed for messages destined to T-Mobile.
  • If message size is over 3 MB, then the message will be dropped.

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What are the MMS file size limits for the major carriers in the US?

Carrier Long Code Short Code Toll-Free
AT&T 1 MB 1 MB 525 KB
Verizon 1.2 MB 1.2 MB 525 KB
T-Mobile 1 MB 1 MB 525 KB
Sprint 2 MB 2 MB 525 KB
US Cellular 500 KB 500 KB 525 KB

Note: The file sizes above will generally be passed along to the wireless carriers. However, due to the differences in handsets, file types, and transcoding, we recommend you send attachments no larger than 500 KB to ensure the best chance of delivery.

Can I programmatically find out the destination carrier's maximum file size for MMS messages?

No, not at this time.

What is the character limit for the text portion of MMS messages?

We recommend sending MMS messages with 1,000 characters or fewer in the text portion of the message for best deliverability.

Where can I find more information on toll-free MMS?

Check out our toll-free MMS FAQ for a deeper dive into toll-free MMS.

Questions? Please open a ticket with your Bandwidth Support Team or hit us up at (855) 864-7776!

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