How to Crop an Image to a Specific Aspect Ratio (1:1, 4:5, 16:9)

An aspect ratio is the width divided by the height, written like 16:9. A 1920 by 1080 image is 16:9, a 1080 by 1080 image is 1:1, and a 1080 by 1350 image is 4:5. Two images with different pixel sizes can have the same ratio and look the same shape.

1:1 is the square used for profile pictures and many feed posts. 4:5 is a tall portrait that takes more room in a phone feed. 16:9 is widescreen video and most thumbnails. 9:16 is the vertical format of stories and short videos. 3:2 is the shape of most DSLR photos and 4:3 is the classic phone camera shape.

Platforms change their recommendations from time to time, so check the current size before a campaign, but these shapes have been stable for years.

If a picture does not match the target ratio, you have two honest choices: crop away the extra, or add borders. Stretching it to fit squashes faces and circles, and it always looks wrong. Choose the ratio first, then slide the crop frame over the part of the picture that matters most.

Keep the subject away from the edges and leave a little breathing room, because some platforms trim an extra margin or overlay buttons on the picture. For group shots, crop to the ratio that keeps faces fully inside the frame.

Once the shape is right, scale it to the exact pixel size you want and compress. Cropping first and resizing afterward keeps the proportions intact and produces the sharpest result.