Crop to any ratio or a circle. Runs on your device.
An aspect ratio is the width divided by the height. Pick Free to draw any box, or a preset to lock the shape: 1:1 for a square profile picture, 4:3 or 3:2 for a typical camera photo, 16:9 for a video thumbnail, 3:4, 2:3 and 9:16 for portrait shapes. Custom takes any two whole numbers from 1 to 999, such as 5:4. When you pick a ratio, the box shrinks to the largest box of that shape that fits inside your current box, around the same centre, so you do not lose your place. With a locked ratio only the four corner handles are shown, because an edge handle could not keep the shape. A ratio fits whatever the picture allows: a 4000 by 3000 photo at 3:4 gives a box of 2250 by 3000 pixels, centred.
A circle crop cuts a round picture out of a square box. Switch on Circle crop and the box becomes 1:1 and is drawn as a circle. The file is always saved as PNG, even when you add a JPEG, because JPEG cannot store transparency and the corners outside the circle must stay clear. The saved file is named with -circle at the end of its name. Some sites place a profile picture inside their own round frame and want a square file instead; for those, leave Circle crop off and use 1:1. A circle PNG can be larger in bytes than the JPEG it came from, since PNG stores every pixel exactly. The result row shows both sizes so you can see it.
Rotate left, Rotate right, Flip horizontal and Flip vertical change the picture itself, and the box then works on what you see. After each of these the box goes back to its starting position for the current ratio, because a box drawn on the old orientation would no longer point at the same part of the picture. A phone photo that carries a rotation flag is shown upright from the start, and the crop is taken from that upright picture. Reset puts the box back and undoes every rotate and flip. This tool does not straighten a picture by a small angle, and it does not zoom or move the picture inside the box.
The picture is opened by your browser's own image code and drawn onto a canvas inside this tab. The crop is a single copy of the pixels in the box, so nothing is resized. There is no upload step and no server that receives pictures. The page counts visits with Google Analytics; those counts say which tool was opened, never a file name, an image, a position or a size. The saved file is drawn fresh from pixels, so it carries none of the original's metadata, such as GPS location or camera model. Memory sets the limits: single images up to 100 megapixels, or 50 on a phone. Larger ones are scaled down to fit the device first, and the tool tells you before you crop.
The pixels inside the box are copied as they are, with no resizing. A PNG is saved without any loss. A JPEG or WebP is encoded again at quality 0.92, which adds a very small loss. If the crop is 3000 by 2000 pixels, the result is 3000 by 2000 pixels.
The corners outside a circle must be transparent, and JPEG cannot store transparency. PNG can, so a circle crop of a JPEG is saved as a PNG named with -circle at the end. The file can be larger than the JPEG it came from.
One image at a time. If you drop 3 files, the first is used and the tool says so. To crop another, press Start over and add the next one.
Yes. X and Y are the left and top edges of the box, and Width and Height are its size, all in pixels of the picture you see. With a locked ratio, typing a width of 1000 at 16:9 sets the height to 563. Values outside the picture are not accepted, and the field goes back to the box's own value when you leave it.
Tab to the crop area. The arrow keys move the box by 1 pixel and Shift with an arrow moves it by 10. Alt with an arrow resizes: Right and Down grow it, Left and Up shrink it, in steps of 1 pixel or 10 with Shift. The box never leaves the picture.
Rotating or flipping changes which part of the picture is where, so a box drawn before would point at a different area. The box goes back to its starting position for the current ratio. Choose your rotation first, then draw the box.