Developer tool
Standalone tool pageAspect Ratio Calculator
Calculate image or video aspect ratio and resize dimensions.
Output
Result
Aspect ratio
Resized width
Resized height
How It Works
The calculator reduces width and height to a ratio, then uses proportional scaling to find the missing resized dimension.
Example
A 1920×1080 image has a 16:9 ratio. If resized to 1280 wide, the matching height is 720.
Frequently Asked Questions
What is aspect ratio?
Aspect ratio is the proportional relationship between width and height, such as 16:9, 4:3, or 1:1.
How do I resize without stretching?
Enter the original width and height, then set either a new width or a new height. The other dimension is calculated automatically.
Does this send data to a server?
The current draft tools are designed for browser-side utility work. Still avoid pasting secrets unless the project has been fully reviewed for your deployment.
Should I verify output?
Yes. For production work, validate the result in your actual codebase, terminal, CI, or target environment.