Why a square and not a circle?
Telegram itself crops a square video into a circle when sending it as a video message — preparing a 1:1 frame is enough.
Make a Round Video for Telegram
Crop the video into a 1:1 square — Telegram will display it as a round video message when sent.
Frequently asked questions
Which size is best?
Cropping into a square is enough — Telegram will adjust the exact resolution automatically.