End-to-end encryption is an important feature in messaging, as it's the first step in protecting users from surveillance. 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. Informative 3How to create a Telegram channel?
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