广而告之：Telegram 移动端 客户端内自助编辑 Sticker 功能现已实装.
https://telegram.org/blog/sticker-maker
Telegram
Sticker Editor — Create Your Own Stickers
Sticker Editor — Create Your Own Stickers
Starting today, anyone can quickly create stickers and entire sticker sets using a new powerful editor — without leaving Telegram.