About this utility
How to use Aspect Ratio & Dimensions Calculator
Reduce an image or video ratio and calculate missing dimensions for responsive layouts.
What to provide
Enter dimensions such as 1920x1080 or a ratio such as 16:9.
- Paste, type, or drag and drop a supported text file into the input area.
- Choose the options that match your intended result.
- Select “Run tool” or press Ctrl/Command + Enter, then copy, download, or move the result back into the first input for another pass.
What the result means
Reduced ratio, orientation, decimal ratio, common-name match, and calculated target dimensions.
Privacy and safety
This utility is loaded as browser code and processes your input only in this tab. OmniCastConverter has no upload endpoint and never stores your content, filenames, tokens, or secrets. Generated markup and code are shown as inert text and are never executed.
Limitations
- Pixel aspect ratio, cropping, safe areas, print density, and device-pixel ratio are separate concerns.
Try the included example
Select “Load example” at any time to restore this tested sample.
1920x1080