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How to Create a Private or Public Channel on Telegram? Add up to 50 administrators best-secure-messaging-apps-shutterstock-1892950018.jpg 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.”
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