Change an image's aspect ratio

Change the shape of your photo to square, 16:9, 4:5 or anything else.

or drop it below · paste works too

FreeNo sign-upResized here, on your own machine.

Choose photoor drop it here · paste works too · several at once is fine

No file to hand?

No picture open Resized here, in this tab

Type a size now, or pick a preset — it applies when a picture opens.

Resize

Size by

Ratio W

Ratio H

Long edge

The box is the largest 16:9 that fits inside the picture, so nothing is enlarged. Fill crops to the shape, Pad adds a margin, Stretch squeezes — choose under Fit to box.

File size

Off: the file is written at the quality in Export. Pick a limit when a form gives one in KB.

Fit to box

Aspect ratio keeps the picture's shape, so there is no box to fit. Switch to Pixels for a box of any shape.

Quality

Auto is right for photographs. Sharp suits text and line art; Smooth suits skin and sky.

Never enlarge

A target bigger than the picture stops at the picture's own size.

Drag the box's edges or corner on the canvas, or type the numbers. Keys: L chain · Ctrl Z undo · C compare · hold Space for the original · 0 fit · 1 100% · Ctrl K find a size. How the resampling works.

Pick the shape. Fill crops to it, Pad adds a margin, Stretch squeezes — and the page says exactly how much of each.

Opens on 16:9 with Fill. The box is the largest 16:9 inside the picture, so nothing is enlarged; give it a long edge to size it too.

A worked example

A 4032 × 3024 photo to 16:9 with Fill becomes 4032 × 2268: 756 rows are discarded, split above and below unless you drag or anchor the crop. To 9:16 with Pad it becomes 2268 × 4032, with the whole photo scaled to 2268 × 1701 and the rest margin.

When another page here fits better

To choose the crop by hand, use crop and resize. For a fixed pixel box such as 1920 × 1080, the dimension pages open with it.

What stays on your device

The shape is arithmetic in the page and the pixels are moved in a worker in this tab. Nothing is sent anywhere.

A ratio cannot be met without giving something up: Fill gives up a strip of the picture, Pad gives up the frame's fullness, Stretch gives up the true shape.

Questions people ask here

Which is better, Fill or Pad?

Fill keeps the frame full and throws away a strip; Pad keeps the whole picture and adds a margin. For a profile picture or a thumbnail, Fill; for a product or a document where nothing may be cut, Pad.

Why not Stretch?

Because it changes the shape of everything in the picture. The page measures it — a 4:3 photo stretched to 16:9 is 33% wider than life — and keeps it available for the rare specification that demands it.

Does changing the ratio change the pixel count?

With Fill and no long edge, the result is the largest box of that shape inside the picture, so it has fewer pixels. With Pad, the box is the picture's long edge in the new shape and the margin is added around it.