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Free Online Image Aspect Ratio Calculator

Work out the aspect ratio of any width and height, see the shape drawn to scale, and get the common name if it has one. Type a new width and the matching height appears, and any target box is answered twice: the size that fits inside it and the size that fills it.

Free Forever Nothing Uploaded Shape Drawn Fit and Fill

Free Online Image Aspect Ratio Calculator

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Image Aspect Ratio Calculator 1920 x 1080 is 16:9

16:9

Aspect ratio 16:9

As a decimal 1.778

Shape Landscape

Megapixels 2.1 MP

Your size

Width

Height

Start from a known ratio

Ratio The height is worked out from the width you already have, so your picture keeps its width.

Resize keeping the shape

New width

New height

Type a new width or a new height and the other one is filled in for you.

Fit inside a box

Box width

Box height

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Is It Safe to Do This Online?

A fair question, and the answer is checkable.

What happens to your picture	Most sites that do this	This page
Where the work is done	On their server	In your browser
Who else can see the picture	Whoever runs the server	Nobody, it never left
What happens to the GPS location	Reaches them before it is stripped	Never leaves your device
Can you verify the claim	No, you have to trust it	Yes, see below

Check it yourself. Press F12 to open your browser tools and go to the Network tab. Drop a picture in and use the tool. You will see the page fetch its own code and nothing else: your file is never sent. For a stronger test, load this page, turn off your wifi, and use it anyway. It still works, which would be impossible if a server were doing the job.

How to Work Out an Aspect Ratio

Drop, choose, download. Your originals are never touched.

Step 1 Type the width and height you have. The shape appears straight away.

Step 2 Read the reduced ratio, the decimal, and the common name if there is one.

Step 3 To resize, type the new width and the matching height is filled in.

Step 4 To check a target box, type its size and see what fits and what fills.

Where Aspect Ratios Bite

Almost every cropping complaint is one of these three.

An aspect ratio is a shape, not a size. 1920 by 1080 and 1280 by 720 are the same shape. That is why a ratio never tells you whether a picture is big enough, and why a tool that only reports the ratio is only doing half the job.

Changing the ratio always loses something. There is no way to turn a 16:9 photograph into a square without either cutting the sides off or adding bars. Any tool that claims otherwise is doing one of those two things without telling you.

Fit and fill are opposites and both are useful. Fitting puts the whole picture inside the box and leaves gaps. Filling covers the box and cuts off whatever hangs over the edge. A profile picture fills; a product photograph on a white background fits.

The awkward ratios are rounded ones. Cinema scope is 2.39:1 and a link preview is 1.91:1, neither of which reduces to tidy whole numbers. Those are given as decimals here rather than being forced into a fraction that would be slightly wrong.

Key Features & Capabilities

What this tool does, and what it deliberately does not.

The shape, drawn A box in the real proportions, because a picture of the shape is easier to judge than two numbers.

Reduced properly The ratio is cut down to its smallest whole numbers, with a decimal alongside for the ones that do not reduce neatly.

Names you recognise Widescreen, square, stories, ultrawide, cinema scope and link preview are all recognised and named.

Resize without distorting Type one new dimension and the other is worked out, so nothing gets stretched.

Fit and fill worked out For any target box you get both answers: the size that fits inside it, and the size that covers it with the overflow cut off.

Nothing uploaded It is arithmetic in your browser. No picture is needed and nothing is sent anywhere.

About the Image Aspect Ratio Calculator

An aspect ratio is the shape of a rectangle written as two numbers, and almost every complaint about a picture being cropped badly comes down to a mismatch between two of them.

The arithmetic is simple, which is why so many calculators stop there. What is usually missing is the part that helps: seeing the shape, knowing what it is called, and getting the numbers you actually need next. Those are the three things this page adds. The box is drawn in the real proportions, the common ratios are recognised by name, and typing one new dimension gives you the other.

The fit and fill section answers the question behind most cropping problems. When a picture has to go into a box of a fixed shape, there are only two honest options: scale it until it sits inside with gaps on two sides, or scale it until it covers the box and lose what hangs over the edge. Both sizes are worked out for you, along with how much gets cut.

Some ratios do not reduce to tidy numbers. Cinema scope is 2.39:1 and a link preview is 1.91:1, and forcing those into whole numbers would make them slightly wrong, so they are reported as decimals instead.

Nothing here needs a file and nothing is uploaded. It is arithmetic, done in your browser.

Frequently Asked Questions

Ratios, resizing, fitting and the common sizes.

Divide the width and the height by their greatest common divisor. Type both numbers here and it is done for you, with the decimal and the common name alongside.

16:9, which is widescreen video and the shape of almost every television and laptop screen. As a decimal it is 1.778.

Keep the ratio. Type your current size, then the new width you want, and the matching height appears. Use that exact pair and nothing is distorted.

Fitting scales the picture until the whole of it is inside the box, which leaves empty space on two sides. Filling scales it until the box is covered, which crops whatever hangs over the edge. Both sizes are shown here.

1:1 or 4:5 for a feed post, 9:16 for stories and short video, and 1.91:1 for a link preview. All of them are in the ratio list, and the shape is drawn so you can see what you are committing to.

No. This works out the numbers. When you know the size you want, the image resizer on this site will actually produce the file, and it does that in your browser too.