Image aspect ratio calculator
Find the simplest width-to-height ratio and calculate matching dimensions.
How to use this tool
- Choose an image or a batch of images.
- Adjust the preset dimensions, crop or padding. Review the result before saving.
- Check the output preview and actual file size, then download. Batch mode applies the chosen settings to each file.
What happens to your image?
The calculator reduces whole-number dimensions by their greatest common divisor. A proportional width or height is calculated without uploading a file.
Your image is decoded and processed locally in your browser. Selected images and generated files are not sent to an image-processing server.
Is aspect ratio the same as resolution?
No. 1920 × 1080 and 1280 × 720 both have a 16:9 ratio, but contain different numbers of pixels.
Supported files and limits
Upload JPG, PNG, WebP, HEIC, GIF or BMP. Files must be at most 40 MB, 12,000 pixels on either side, and 40 megapixels. HEIC is decoded locally on demand. GIF conversion uses its first frame. Animated PNG/WebP and SVG are not supported. Batch processing accepts up to 30 files and 200 MB total.
Converted files do not retain original EXIF metadata or color profiles. You can clear the editor when finished.