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How to Create a Private or Public Channel on Telegram? 5Telegram Channel avatar size/dimensions 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. 2How to set up a Telegram channel? (A step-by-step tutorial)
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