To edit your name or bio, click the Menu icon and select “Manage 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. Invite up to 200 users from your contacts to join your channel The visual aspect of channels is very critical. In fact, design is the first thing that a potential subscriber pays attention to, even though unconsciously. 5Telegram Channel avatar size/dimensions
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