How to use this tool
Enter original width and height in pixels, then set either target width or target height. The calculator preserves proportions, reduces the ratio and previews the canvas shape.
Quick steps
- Enter the original pixel width and height of an image or video.
- Choose a new target width or height to preserve the original aspect ratio.
- Read the simplified ratio and the proportionally resized dimensions.
Practical tip
Pixel dimensions alone do not determine image quality. Enlarging a small source may cause blur; this tool computes dimensions but does not resample or alter image files.
Common questions
How do I keep an image's proportions?
Change one target dimension and calculate the other from the original width-to-height ratio.
Can this resize an uploaded image?
No. This calculator gives proportional dimensions; use the Image Compressor & Converter to process an actual file.
Is 1920 × 1080 the same shape as 16:9?
Yes. Dividing both dimensions by their greatest common divisor gives the simplified ratio 16:9.