The recommended 페이스북 Facebook ad (feed) spec is 1080×1080 px (1:1). Feed ads: 1080×1080 (1:1) recommended, minimum 600×600. Story placements are 1080×1920.
"Fill" center-crops when the ratio differs. "Fit" pads with the chosen color. "Fit width" keeps the height ratio, for detail pages.
Drag the preview of a "Fill" result to move the crop.
JPG, PNG or WebP, quality 50–100. Each result card shows size and weight.
Select several files to convert them to the same spec and download with "Save all".
1080×1080 px, ratio 1:1. Feed ads: 1080×1080 (1:1) recommended, minimum 600×600. Story placements are 1080×1920.
Choose "Fit (padding)" to avoid cropping; with "Fill" you can drag the preview to move the crop.
Upscaling beyond the original blurs. Use the largest original you have; when downsizing, quality 90+ is visually lossless.