How to Create a Private or Public Channel on Telegram? To view your bio, click the Menu icon and select “View channel info.” 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. The Channel name and bio must be no more than 255 characters long Telegram Android app: Open the chats list, click the menu icon and select “New Channel.”
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