best-secure-messaging-apps-shutterstock-1892950018.jpg 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. 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. Hashtags The Channel name and bio must be no more than 255 characters long
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