CT Text - MMS File Size Limit
This guide explains common MMS image size limits across major U.S. carriers and messaging service providers, including:
- Typical MMS image size limits by carrier
- How MVNOs inherit carrier limitations
- Differences between long-code, short-code, and toll-free routes
- Recommended image sizes for reliable delivery
- MMS provider upload limits and carrier behavior
MMS Image Size Limits by Carrier
MMS image size limits vary by carrier, messaging route, device type, and whether media is compressed during delivery.
|
Carrier / Provider |
Typical Maximum Image Size |
Notes / Behavior |
|
AT&T including Cricket and Consumer Cellular |
~1.0 MB |
Larger attachments are commonly compressed. Most AT&T MVNOs inherit these limits unless Advanced Messaging is supported. |
|
Verizon including Visible, Xfinity Mobile, and Spectrum Mobile |
~1.2 to 1.7 MB |
Limits vary depending on the message route. Long-code routes commonly support larger image sizes. |
|
T-Mobile including Metro, Mint, and Sprint legacy |
~1.0 to 3.0 MB |
Supported size depends on routing, device compatibility, and network handling. |
|
US Cellular |
~500 KB |
Industry references commonly place US Cellular MMS limits near 500 KB. |
|
Cricket Wireless |
~1 MB or larger with Advanced Messaging |
Standard MMS generally follows AT&T limits. Advanced Messaging may support larger files. |
|
Boost Mobile / Metro / Other MVNOs |
Host carrier dependent |
Most MVNOs inherit MMS size limits from their underlying carrier network. |
|
Toll-free / Short-code Messaging |
~525 KB to 1 MB |
Toll-free and short-code routes commonly support smaller media sizes than standard long-code messaging. |
Recommendation:
For the most reliable delivery across all U.S. carriers and devices, keep MMS images at or below 500 KB.
Understanding MMS Delivery Behavior
MMS delivery behavior varies depending on the carrier network, sender route, and recipient device.
- Long-code routes generally support larger media sizes.
- Short-code and toll-free routes often apply stricter limits.
- Carriers may compress or transcode images during delivery.
- Some devices automatically resize large images before sending.
- RCS or Advanced Messaging can support higher quality media transfers.
If your organization sends MMS campaigns at scale, testing across carriers is strongly recommended.
MMS Limits by Messaging Service Provider
Messaging platforms may allow larger uploads than carriers ultimately support. Carrier restrictions still apply during final delivery.
|
Provider |
Typical Maximum MMS Size |
Notes / Behavior |
|
Twilio |
Up to 5 MB |
Twilio supports larger uploads but recommends smaller images, around 600 KB, for best carrier deliverability. |
|
Bandwidth |
Uploads up to 3.75 MB |
Recommended practical MMS size is around 500 KB for reliable delivery. |
|
Telnyx |
Recommended under 1 MB |
Carrier overhead and encoding can reduce effective delivery limits. |
|
Sinch |
Recommended 500 to 740 KB |
Smaller image sizes are recommended for consistent delivery performance. |
|
Inteliquent |
1 MB pass-through; 1 to 3 MB may be transcoded |
Larger files may be resized or dropped depending on carrier handling. |
Best Practices for MMS Images
To maximize compatibility and delivery success:
- Keep image sizes at or below 500 KB whenever possible.
- Use JPEG images for best compression and compatibility.
- Avoid extremely large image dimensions.
- Test campaigns across multiple carriers and devices.
- Use RCS or Advanced Messaging when higher-quality media is required.
Following these practices helps reduce carrier compression, failed deliveries, and media distortion.
Related Notes
- Carrier limits may change over time depending on network upgrades and messaging policies.
- MMS size handling differs between iPhone, Android, and carrier messaging applications.
- RCS and Advanced Messaging are increasingly replacing traditional MMS limitations for supported users.