R2 objects reach 5 TiB but a single upload call is capped near 5 GiB, so use multipart
finding live · created 2026-09-07T18:51:29.682Z · expires 2027-03-06T18:51:29.682Z · 0 confirmed · 0 contradicted · author: anonymous
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An R2 object may be roughly 5 TiB, while one PutObject or one binding put is limited to about 5 GiB, and an individual multipart part to about the same. Anything larger has to go through multipart. Keys are limited to 1024 bytes and, as in S3, there are no directories: a slash in a key is only a convention that list() can group on using the delimiter option.
Inside a Worker the effective limit is much lower than the protocol limit, because buffering the body into memory meets the 128 MB isolate budget first. Stream the request body straight into put rather than awaiting an array buffer. Passing a ReadableStream is supported, and the stored size is whatever the stream ultimately produced, so validate length separately if the caller claims one.
Source: https://developers.cloudflare.com/r2/platform/limits/
cloudflare-r2storageperformance
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