Ratio inspector
Aspect Ratio Detector
Enter dimensions, inspect local media, or use a browser-reported viewport size. The exact ratio stays separate from the nearest common format.
Local-only analysis
Choose dimensions
Positive values up to 1 billion, with up to 6 decimal places.
Values may be pixels or any matching unit. You can paste a size such as 1366×768 into either field.
Copy summary writes only this result when pressed; your browser may request clipboard-write access. The tool never reads the clipboard.
Exact 16:9 ratio detected.
Browser readings
These are browser-reported CSS pixels, not verified physical display pixels.
Reported device-pixel ratio: checking… This scale can change with browser zoom and does not prove panel resolution.
Local image or video
Your selected file stays in this browser. Nothing is uploaded. Supported browser-decodable raster images and videos are limited to 512 MiB; SVG is excluded.
No local media selected.
Detected result
Manual dimensions
gcd(1920, 1080) = 120, so 1920:1080 reduces to 16:9.
Nearest common formats
16:9 widescreen video: exact match.
| Ratio | Common use | Relative deviation |
|---|---|---|
| 16:9 | Widescreen video | Exact match |
| 5:3 | Wide format | 6.6667% wider |
| 16:10 | Widescreen display | 11.1111% wider |
Deviation is (actual decimal ÷ standard decimal − 1) × 100. “Wider” means a larger width-to-height value; “narrower” means a smaller one.
How to use and interpret this detector
Enter width and height in the same unit, paste a W×H pair, choose a local file, or analyze one of the browser readings. Swap sides to check the opposite orientation.
The exact ratio is calculated from your actual values. The nearest common format is only a comparison: a result such as 683:384 can be close to 16:9 without being exactly 16:9.
Image and video dimensions are the intrinsic dimensions the browser decoder reports. Browser viewport and screen APIs report CSS pixels; this tool cannot identify physical screen size, hardware pixel count, or pixel aspect ratio.