Image Resizer
Resize images online free. Set exact width and height in pixels, keep aspect ratio, and download instantly. Ideal for thumbnails, social banners, and product photos.
Image ToolsCalculators / browser workspace
Aspect Ratio Calculator
Simplify an image aspect ratio and calculate proportional dimensions.
Browser workspace
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A quick start
How to use it
- Enter the original width and height.
- Enter the desired output width.
- Read the simplified ratio and proportional height.
Common questions
How do I use the aspect ratio calculator?
Enter the original width and height. Enter the desired output width. Read the simplified ratio and proportional height.
What should I check before using the result?
This calculates dimensions only. It does not crop, enlarge, or modify an image, and fractional pixels must be rounded for an export.
Is my input stored or uploaded?
No. Tool input stays in browser memory and is not sent to a server. Favorites and recent tool names are saved locally only. Reloading clears your input.
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