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. The Channel name and bio must be no more than 255 characters long A new window will come up. Enter your channel name and bio. (See the character limits above.) Click “Create.” To view your bio, click the Menu icon and select “View channel info.”
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