1What is Telegram Channels? ZDNET RECOMMENDS How to Create a Private or Public Channel on Telegram? Telegram is a leading cloud-based instant messages platform. It became popular in recent years for its privacy, speed, voice and video quality, and other unmatched features over its main competitor Whatsapp. 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.
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