To send attachments, your Twilio phone number should be MMS enabled. We support up to 10 attachments, as long as the total size of the message body text and all attachments is less than 5 MB.

Carriers also have limits. The average is 300kb-600kb and can go up to 3.5MB for tier 1 providers (AT&T/Verizon, etc.)

The image to the right shows the Carrier Attachment Size limits for some common US Carriers.

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

These image file types are supported:

jpeg, png and gif