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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. 5Telegram Channel avatar size/dimensions How to Create a Private or Public Channel on Telegram? Telegram iOS app: In the “Chats” tab, click the new message icon in the right upper corner. Select “New Channel.” How to Create a Private or Public Channel on Telegram?
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