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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. Choose quality over quantity. Remember that one high-quality post is better than five short publications of questionable value. The Channel name and bio must be no more than 255 characters long 2How to set up a Telegram channel? (A step-by-step tutorial) 5Telegram Channel avatar size/dimensions
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