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. To delete a channel with over 1,000 subscribers, you need to contact user support Invite up to 200 users from your contacts to join your channel Choose quality over quantity. Remember that one high-quality post is better than five short publications of questionable value. 4How to customize a Telegram channel?
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