4How to customize a Telegram channel? 5Telegram Channel avatar size/dimensions 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. 6How to manage your Telegram channel? Telegram desktop app: In the upper left corner, click the Menu icon (the one with three lines). Select “New Channel” from the drop-down menu.
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