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October 31, 2025 · Cloudflare

Workers, Durable Objects, Browser Run - Workers WebSocket message size limit increased from 1 MiB to 32 MiB

Workers, including those using Durable Objects and Browser Rendering, may now process WebSocket messages up to 32 MiB in size. Previously, this limit was 1 MiB.

This change allows Workers to handle use cases requiring large message sizes, such as processing Chrome Devtools Protocol messages.

For more information, please see the Durable Objects startup limits.