What is the 1:1 aspect ratio?
1:1 means the width equals the height, which makes a square. The decimal ratio is exactly 1. Squares look the same whichever way a phone is held, and they sit neatly in grids, so they are common for feeds, catalogues and profile images.
How to calculate 1:1 dimensions
This is the simplest ratio: height = width. The real decision is how large the square should be. Pick the largest size your destination displays, so the image stays sharp on high-density screens.
Where 1:1 is used
- Social posts: 1080 × 1080 is a widely used square post size.
- Profile pictures and avatars: usually uploaded as squares, then often shown as circles.
- E-commerce: square product photos keep catalogue grids tidy.
- App and website icons: icons are almost always square.
Cropping a 16:9 image to 1:1 keeps only about 56% of its width. Cropping a 4:3 photo keeps 75%. Centre your subject before cropping.
Circles start as squares
When a platform shows a profile picture as a circle, it crops the corners of your square. Keep faces and logos inside the central circle, with a little padding, so nothing important gets cut.
Frequently asked questions
What size is a 1:1 image?
Any size where width equals height. 1080 × 1080 is common for social posts. 512 × 512 is common for icons and avatars.
Is a 1:1 image always a square?
Yes. If width and height are equal, the image is a square, whatever its pixel size.
How do I make a photo square without cropping?
Upload it to the image formatter, choose Square, then Fit whole image. The whole photo is kept and the extra space is filled with white, grey or black, or left transparent if you download a PNG.