2How to set up a Telegram channel? (A step-by-step tutorial) 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. Telegram iOS app: In the “Chats” tab, click the new message icon in the right upper corner. Select “New Channel.” A new window will come up. Enter your channel name and bio. (See the character limits above.) Click “Create.” Clear
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