Telegram desktop app: In the upper left corner, click the Menu icon (the one with three lines). Select “New Channel” from the drop-down menu. 2How to set up a Telegram channel? (A step-by-step tutorial) 5Telegram Channel avatar size/dimensions Telegram is a leading cloud-based instant messages platform. It became popular in recent years for its privacy, speed, voice and video quality, and other unmatched features over its main competitor Whatsapp. 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.
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