[mg]

Shouldn't it be the task of the platform (Twitter/Mastodon/FB/Insta/...) to make images look good?

When surrounding an image with a background color before posting it, you have to add a huge margin because you don't know in which aspect ratio it will be displayed on the users device, right?

[slava_ustinov]

You can choose the aspect ratio and size you want (supports official sizes from Twitter, Instagram, Facebook)

[mg]

Interesting. I now see that Twitter scales and crops images the same way, independent of your screen.

That makes it indeed predictable, how a posted image will look like.