A sticker is a GIF file with transparency around the edges that can be used to enhance your storytelling in all kinds of ways! In order to register as a sticker, at least 20% of pixels must be transparent in the first frame. Transparent videos won't work here. We sort stickers separately from GIFs, and they have their own API as well. This API powers the sticker experience for tons of different apps, with various uses from messaging to photo editing.