Aspect ratio checker
Enter the dimensions of a file and find out which networks take it as-is, which crop it, and how much of the frame you lose when they do.
Which ratio for which network
| Ratio | Use it for | Why |
|---|---|---|
| 9:16 | Reels, Shorts, TikTok, Stories | Full screen on a phone. Anything else is letterboxed. |
| 4:5 | Instagram and Facebook feed | The tallest the feed allows — most vertical space per scroll. |
| 1:1 | Safe everywhere | Crops acceptably to every other ratio. The compromise choice. |
| 16:9 | YouTube, X video | Standard landscape. Poor on a phone feed. |
| 2:3 | Pinterest's own recommendation; taller pins get cropped in the grid. |
The crop percentage is the useful number
“Needs a crop” tells you nothing about whether the crop is survivable. Going from 16:9 to 9:16 throws away about 68% of the frame — anything at the edges is gone, and a subject that is not dead centre will be cut in half. Going from 1:1 to 4:5 loses about 11%, which you will not notice.
If you shoot once and post everywhere, shoot 4:5 or 1:1 and keep the subject centred. Both crop to everything else without losing the point of the shot.
Questions
What does the crop percentage mean?
The share of the original frame a centre crop to that ratio would discard. Above roughly 40%, expect to reframe the shot rather than crop it.
Does it matter if I am a few pixels off?
No. This treats anything within 2% as an exact match, which is the same tolerance the platforms apply. 1080×1349 is 4:5 for every practical purpose.
What resolution should I upload?
Match the ratio and give the platform more pixels than it needs — they downscale well and upscale badly. 1080px on the short edge is a sensible floor for anything vertical.
Is my file uploaded anywhere?
No file is involved. You type two numbers and the arithmetic happens in your browser.