Popular ratios
Proportional sizing
Keep images and video in proportion
Enter the original dimensions, then change either new width or new height. The other value follows automatically.
Ratio logic
The original width divided by height defines the ratio. New dimensions use that same relationship.
Local calculation
Dimensions are processed only in your browser.
Accuracy & trust
Built to be useful. Designed to be checked.
We test and review CoreBase tools, formulas, and information to keep them useful and accurate. Occasional inaccuracies or circumstances specific to your situation can still affect a result, so verify important decisions against your own requirements.
Found something that does not look right? Tell us so we can review and improve it.