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. But a Telegram statement also said: "Any requests related to political censorship or limiting human rights such as the rights to free speech or assembly are not and will not be considered." More>> 2How to set up a Telegram channel? (A step-by-step tutorial) The Channel name and bio must be no more than 255 characters long
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