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5Telegram Channel avatar size/dimensions Telegram Channels requirements & features Public channels are public to the internet, regardless of whether or not they are subscribed. A public channel is displayed in search results and has a short address (link). 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. 2How to set up a Telegram channel? (A step-by-step tutorial)
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