Image sizes that work everywhere

Upload a 1200 × 630 pixel image (about 1.9:1) under 5 MB. It renders well on Facebook, X, LinkedIn, Slack and Telegram, and WhatsApp crops it to a square from the centre, so keep the subject in the middle.

Anchorpost warns when an image is far from that ratio, very small or over 5 MB. Use the WhatsApp override with a square image if the centre crop does not work for a particular campaign.