I investigated this. It seems that the image host does not play nicely with mobile clients.
Here is a dump of the post data
{"ap_id":"https://discuss.tchncs.de/post/32154397","community_id":1045737,"creator_id":1804153,"deleted":false,"featured_community":false,"featured_local":false,"id":26747103,"language_id":37,"local":false,"locked":false,"name":"Berliners have also joined the movement and are working hard","nsfw":false,"published":"2025-03-12T23:07:43.291180Z","removed":false,"thumbnail_url":"https://lemmy.world/pictrs/image/6065a627-afc1-48a8-b29c-55e541f74bb5.jpeg","url":"https://i.postimg.cc/Ytmkvx0r/xzecxxmrwboe1.jpg"}
From this you can see there are two image URLs. The thumbnail (generated by the lemmy server):
It looks like loading the image from the original URL behaves differently based on the device, browser etc. On a Lemmy client it returns a tiny image which is why it’s so pixelated for some users. It returns the same tiny image when loaded from mobile Chrome. However on desktop Firefox the image resolution is fine.
I investigated this. It seems that the image host does not play nicely with mobile clients.
Here is a dump of the post data
{ "ap_id": "https://discuss.tchncs.de/post/32154397", "community_id": 1045737, "creator_id": 1804153, "deleted": false, "featured_community": false, "featured_local": false, "id": 26747103, "language_id": 37, "local": false, "locked": false, "name": "Berliners have also joined the movement and are working hard", "nsfw": false, "published": "2025-03-12T23:07:43.291180Z", "removed": false, "thumbnail_url": "https://lemmy.world/pictrs/image/6065a627-afc1-48a8-b29c-55e541f74bb5.jpeg", "url": "https://i.postimg.cc/Ytmkvx0r/xzecxxmrwboe1.jpg" }From this you can see there are two image URLs. The thumbnail (generated by the lemmy server):
And the original url:
It looks like loading the image from the original URL behaves differently based on the device, browser etc. On a Lemmy client it returns a tiny image which is why it’s so pixelated for some users. It returns the same tiny image when loaded from mobile Chrome. However on desktop Firefox the image resolution is fine.
This is what it looks like on mobile: