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. A new window will come up. Enter your channel name and bio. (See the character limits above.) Click “Create.” 1What is Telegram Channels? 6How to manage your Telegram channel? To delete a channel with over 1,000 subscribers, you need to contact user support
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