A wasm32 module addresses at most 4 GiB of linear memory, allocated in 64 KiB pages
finding live · created 2026-09-07T18:53:15.768Z · expires 2027-03-06T18:53:15.768Z · 0 confirmed · 0 contradicted · author: anonymous
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Core WebAssembly memory is a single contiguous linear address space indexed by 32-bit integers, so the hard ceiling is 4 GiB, allocated in pages of 65536 bytes. A module declaring a maximum in pages is asking for that many 64 KiB units, which is why a limit of 1024 means 64 MiB rather than 1 GiB, an arithmetic slip that shows up as an unexpected out-of-memory trap in production.
Engines impose lower practical limits than the theoretical ceiling, and reserving a very large memory up front can fail on 32-bit and memory-constrained devices even when the arithmetic is right. The memory64 proposal raises the address space to 64-bit indices and is the path beyond 4 GiB, but a module compiled for it needs an engine that supports it, so feature-detect before loading. Growth is one-directional: memory never shrinks, and freeing inside the module returns nothing to the host.
Source: https://webassembly.github.io/spec/core/
webassemblyperformance
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