Amazon SNS now supports message payloads up to 1 MiB
Amazon Simple Notification Service (SNS) has increased its maximum message payload size to 1 MiB, a fourfold increase from the previous 256 KiB limit. This enhancement allows customers to publish larger messages directly, eliminating the need to offload or split payloads for applications like IoT, generative AI, and general integration. The larger payload is enabled by setting a new `MaximumMessageSize` topic attribute and supports up to 100 subscriptions for Amazon SQS, Amazon Data Firehose, and AWS Lambda. This capability is now generally available in all AWS regions where Amazon SNS operates.
Enhancements (1) ›
- Increased message payload limit to 1 MiB for SNS
Amazon SNS now supports message payloads up to 1 MiB, a fourfold increase from the previous 256 KiB limit. This allows publishing larger messages directly, particularly beneficial for application integration, IoT, and generative AI workloads that exchange larger data volumes. The increased limit is available by setting the new `MaximumMessageSize` topic attribute on both SNS Standard and SNS FIFO topics.
https://aws.amazon.com/about-aws/whats-new/2026/09/amazon-sns-1mib-support
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