Amazon SNS Increases Maximum Message Payload to 1 MiB

Amazon Simple Notification Service expanded message payload size fourfold, enabling larger data transmissions in pub/sub messaging.

By Victor Hale · Editorial pseudonym · 2026-09-18 · 1 min read

AI-ASSISTED REPORTING · RETROSPECTIVE ARCHIVE

Retrospective edition: 2026-09-18. Source published: 2026-09-18. Added to this archive: 2026-11-03. This briefing was prepared later from the linked announcement; it was not published on this website on the historical edition date.

The previous 256 KiB limit on SNS message size was restrictive for use cases involving IoT, generative AI, and distributed systems requiring large data payloads. The new 1 MiB limit permits sending bigger messages directly to SNS topics.

This change applies to both Standard and FIFO topics supporting integrations with Amazon SQS, AWS Lambda, and Amazon Kinesis Data Firehose subscriptions. It is available in all AWS regions, facilitating more flexible and efficient event-driven application architectures.

Source & further reading

Amazon SNS now supports message payloads up to 1 MiB ↗

Source published 2026-09-18. This report was prepared with AI assistance from the linked primary-source material. Claims and limitations should be checked against the original announcement or research.