2How to set up a Telegram channel? (A step-by-step tutorial) A new window will come up. Enter your channel name and bio. (See the character limits above.) Click “Create.” How to Create a Private or Public Channel on Telegram? The optimal dimension of the avatar on Telegram is 512px by 512px, and it’s recommended to use PNG format to deliver an unpixelated avatar. It’s easy to create a Telegram channel via desktop app or mobile app (for Android and iOS):
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