Find your image aspect ratio, calculate matching dimensions, and preview how a photo fits different frames. Free online, with no sign-up.
Why we recommend it
Designers often need exact dimensions for a target ratio such as 1:1, 4:5 or 16:9. Image Aspect Ratio finds a photo's ratio from a local image or entered width and height, calculates the matching width or height, and previews padding versus centered cropping before you edit in your design tool. Selected images are read locally in the browser. It is free, needs no account, and the source code is available under the MIT license: https://github.com/wherexml/image-aspect-ratio
Keep in mind
- No drag-and-drop upload; you enter width and height manually, so it cannot inspect an actual file.
- Browser-only tool — there is no mobile app, desktop client, or API for automated pipelines.
- Aspect ratios are computed, not verified from a file, so a misread dimension yields the wrong ratio.
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