ActivityPub extensions

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This page exists to document extensions to the ActivityPub protocol. Extensions are developed as part of the SWICG.

Published extensions


In-progress extensions

Debatable about whether it's an extension, but see also ActivityPub and WebFinger.


  • uploadMedia: Upload endpoint URI for this user for binary data. Part of the endpoints mapping. See ActivityPub MediaUpload.

Possible future extensions

This list has come from a variety of sources. Of particular note:'s "protocol" label, ActivityPub's GitHub repo, IRC, and cwebber's blog.