Twitch Animated Emotes From Your Mascot: Sizes and Specs

Twitch wants animated emotes as GIFs at 28, 56 and 112 pixels, each under half a megabyte with up to sixty frames. The 28 pixel size is the real test, so pick reactions that still read when they're that tiny. Start from a transparent WebM, convert it to GIF with a tested command, upload all three sizes, and once approved your chat can use it.