Banners come in more shapes than any other image: wide strips on X and Twitch, 16:9 on YouTube and Discord servers, tall panels on Twitch. The table above compares every banner ImgWrench makes, with the size to upload, the formats each platform accepts and its file limit.
One image, many shapes
Start from a wide, high-resolution image, at least 2560 pixels across, and crop each platform's shape from it. Keep your name, logo and any text near the middle: every platform trims the edges somewhere, and the middle is the one part they all show.
File limits
Limits range from 1MB for a Twitch panel to 10MB for a Twitch or Discord profile banner. Photos saved as PNG can go over quickly; JPG is usually far smaller for banners without transparency.