What is the maximum size of MMS message that you can send?

Keenon_House — Tue, 11 Nov 2025 20:00:25 GMT

Message size limits vary according to the type of message content and by account type and contract and carrier max allowed size and API used.

The table below shows you the maximum MMS API upload sizes for the various supported content types:

With Transcoding - The below Limits applies to MMS accounts that support transcoding on the JSON and MM7 API. Transcoding is only supported on Short Code senders
MMS Image	3000 KB
MMS GIF Image	1024 KB
MMS Audio	10000 KB
MMS Video	50000 KB
MMS Text size	5000 characters
MMS Object	2048 KB - saveMMS/sendMMS API
No Transcoding - The below Limits applies to MMS accounts that do not support transcoding on the JSON and MM7 API. This is supported on Short Code and Toll-Free senders.
MMS Image	1000 KB
MMS Audio	1000 KB
MMS Video	1000 KB

Transcoding is not supported on US Short Code. The following are the published maximum size limits for US Short Code by operator:

* Sizes are subjected to change in future based on provider MMSC size updates

Transcoding is not supported on 10DLC. The following are the published maximum size limits for 10DLC MMS by operator:

* Sizes are subjected to change in future based on provider MMSC size updates

Click here for list of supported file types.

Important Notes:

The final size of Base64-encoded binary data is equal to 1.37 time the original data size. Binary content encoded with Base64 produces a larger file size.
May change based on future changes by the carriers.
Transcoding is only supported on Short Code sender types.
The sendMMS action of the JSON API only supports transcoding for image content.
The saveMMS action of the JSON API supports transcoding for all content types.
The SubmitReq action of the MM7 API also supports transcoding for all content types.

Visit the Sinch MMS product page to learn more about the Sinch MMS API.

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