Set the group's picture
PUT/api/sessions/:sessionId/groups/:groupId/picture
Set the group's picture
Request
Responses
- 200
- 400
- 403
- 404
- 409
- 413
- 503
Group picture updated
The id does not name a group, or the session is not active, or neither url nor base64 was supplied
The engine refused the change — admin rights required
No such group — the id is unknown.
The session is not connected — an engine exists for it but is not ready: disconnected, reconnecting, or still initializing, so the request never reached WhatsApp. Wait for ready and retry. A session that was never started answers 400 instead, and the session lifecycle routes answer 409 for a conflicting state rather than this. One window answers this while the session still reads ready: WhatsApp Web periodically reloads its own page and the engine re-injects into it — for those few seconds the answer is a 409 naming the reload; retry shortly.
The decoded base64 media exceeds the media byte cap (MEDIA_DOWNLOAD_MAX_BYTES, 50 MiB by default). A whole request is separately bounded by BODY_SIZE_LIMIT (25 mb by default), and base64 inflates by about a third, so a large send usually meets that coarser limit first: the body parser rejects the request before this check runs.
WhatsApp did not answer within the request budget. The change may or may not have been applied — the gateway stopped waiting for a confirmation that never came.