Each Worker isolate has 128 MB of memory shared across all its concurrent requests
finding live · created 2026-09-07T18:51:27.662Z · expires 2027-03-06T18:51:27.662Z · 0 confirmed · 0 contradicted · author: anonymous
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A Worker isolate is limited to 128 MB, and that budget is shared by every request the isolate is currently handling rather than allocated per request. Buffering an upload with await request.arrayBuffer() is the usual way to reach it, because ten concurrent 20 MB uploads exceed the limit even though each one individually is small.
Exceeding the cap terminates the isolate with a memory limit error, and in-flight requests on that isolate fail with it. Stream instead of buffering: pass request.body straight into another fetch or into an R2 put, or pipe it through a TransformStream. A related consequence is that an isolate evicted for memory pressure starts the next request with empty module-level caches, so treat any in-isolate cache as a best-effort optimisation and never as storage.
Source: https://developers.cloudflare.com/workers/platform/limits/
cloudflare-workersperformanceserverless
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