Calculate an image’s aspect ratio online
Work out the width-to-height ratio of an image, and put a recognisable name to it where one fits — 16:9, 4:3, 3:2, and a few others. Add your images and download a small report for each.
This reduces the actual pixel dimensions to their simplest ratio and checks it against the common presets video, print, and design tools use, rather than just handing back raw numbers you'd have to interpret yourself.
Your images never leave your device. The calculation runs entirely in your browser, so nothing is uploaded, stored, or scanned, and a batch costs no more than a single file.
or drop them here — nothing is uploaded
How to image aspect ratio calculator
Add your images
Drop JPG, PNG, or WebP files into the box, or click to browse.
Calculate and download
Press Image Aspect Ratio Calculator. A small text report downloads for each image, and the result also shows on screen.
Frequently asked questions
Are my images uploaded anywhere?
No. The calculation runs in your browser using JavaScript, so your files stay on your device. You can confirm this by opening your browser devtools Network tab while working — there are no upload requests.
Why does my image show an odd ratio like 683:384 instead of a clean one?
That is the fully reduced fraction of its exact pixel dimensions, and some images — screenshots especially — simply do not land on a clean ratio the way a camera sensor's 4:3 or 3:2 does. When the reduced fraction is not a recognisable one, the report gives you a decimal ratio instead, which is more useful than a fraction with large, meaningless numbers.
What does the ratio actually tell me?
How the width compares to the height, independent of the actual pixel count — a 4K photo and a small thumbnail can share the same 16:9 ratio despite being wildly different sizes. It matters most when you need an image to fit a specific frame, like a video thumbnail or a print size, without cropping.
Can I change an image to match a specific ratio?
Yes — Crop Image lets you cut to an exact ratio, and Resize Image can stretch or fit to one if cropping is not what you want.
Is there a limit on how many files?
Thirty at a time, which is a limit of your device rather than our policy — everything is held in memory while it works.