What is the difference between MMS and SMS?


MMS (multimedia messaging service) and SMS (short message service) are two text formats you use in your mobile marketing efforts. You send MMS and SMS messages through mobile networks to deliver notifications, promotions, and reminders to your audience.

While both SMS and MMS have their place in your marketing strategy and are similar when it comes to consent, they differ in capabilities.

Key differences between MMS and SMS

Although using both MMS and SMS in your omnichannel marketing strategy can benefit you, here are the differences to consider:

DifferenceMMSSMS
Character limit1600 characters160 characters or 70 with special characters
Media supportText, images, audio filesText, symbols, and emojis
Delivery timeMay take longer due to larger file sizesInstant
Country availabilityUnited States: toll-free numbers and short codesCanada: toll-free numbersAustralia: long codesMultiple countries throughout North America, Europe, and Asia-Pacific
Cost per messageMore expensive but varies per carrierCheaper than MMS

When to use MMS vs. SMS

Use MMS messages when sending multimedia content to your subscribers, such as new product images, or GIF animations. They grab your target audience’s attention more easily than SMS, increasing click rate and purchase rate.

SMS is ideal for concise messages that require immediate delivery, such as:

  • Abandoned cart reminders
  • Time-sensitive promotions like flash sales
  • Order confirmations and shipping updates
  • Customer support updates
  • Welcome messages for new subscribers

When deciding between MMS and SMS marketing, consider your messages’ goal and target audience. If unsure, conduct A/B testing to see which format yields better results.

Ready to launch successful MMS or SMS campaigns that align with your brand and resonate with your subscribers? Sign up for Klaviyo, an all-in-one marketing automation platform that makes it easy to segment your SMS list, create personalized messages with AI, and analyze performance for higher ROI.

Additional resources