5Telegram Channel avatar size/dimensions 2How to set up a Telegram channel? (A step-by-step tutorial) 4How to customize a Telegram channel? 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. A Hong Kong protester with a petrol bomb. File photo: Dylan Hollingsworth/HKFP.
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