Is ToolFlow really free?

Yes. Every tool is completely free with no limits, sign-up or installation.

Many tools process files directly in your browser so data never leaves your device.

Can I drag a box over the image to crop it?

No. ToolFlow's Image Cropper works by measurement. You enter where the crop starts (X and Y) and how big it is (width and height) in pixels, and the tool cuts exactly that area.

What do X and Y mean?

X is the distance in pixels from the left edge of the image to the start of the crop. Y is the distance from the top edge. The top-left corner of the image is 0, 0.

Why do I get a Crop area exceeds image bounds message?

The crop has to fit inside the image. If X plus the width is larger than the image width, or Y plus the height is larger than the image height, the tool stops. Lower the width or height, or move X and Y closer to 0.

What happens if I leave width or height empty?

The tool uses half of the image's width or height. Leaving X and Y empty starts the crop from the top-left corner.

Does cropping change the file format?

No. JPG stays JPG, PNG stays PNG and WebP stays WebP. The new file is named after the original with _cropped added, so your original is not overwritten.

Is my image uploaded anywhere?

No. The image is cropped in your browser and stays on your device.

How to Crop an Image to an Exact Size

How to Crop an Image to an Exact Size (Free, No Software)

Sometimes you need an image to be exactly 800 by 800, or you need to cut off a border without opening an editor. Here is how to crop by pixel measurements, and the simple sum for a perfectly centred crop.

By ToolFlow Team November 14, 2026 5 min read

You have a screenshot with a browser bar you do not want, a photo where the subject sits off to one side, or a profile picture that must be exactly square. Opening a full photo editor for a single crop feels like too much. A cropper that works from simple measurements gets the job done in under a minute, and it gives you exact results that dragging a box by eye never can.

How cropping by measurement works

The Image Cropper asks for four numbers, all in pixels:

X: how far from the left edge the crop starts.
Y: how far from the top edge the crop starts.
Width: how wide the area you keep should be.
Height: how tall the area you keep should be.

The top-left corner of the image is position 0, 0. X counts to the right and Y counts downwards. The crop rectangle starts at your X and Y and extends by your width and height. Everything outside that rectangle is cut away.

How to crop an image with ToolFlow

Open the Image Cropper.
Upload a JPG, PNG or WebP image.
Enter X and Y for where the crop should start. Leave them empty to start from the top-left corner.
Enter the width and height of the area you want to keep.
Click Process and download the cropped image.

The download keeps your original format and adds _cropped to the file name, so photo.jpg becomes photo_cropped.jpg. Your original file is untouched.

Three crops you will use again and again

1. Keep the top-left corner

To keep the top-left 800 by 600 pixels, enter X 0, Y 0, width 800 and height 600. This is the quickest way to trim off the right and bottom of an image.

2. A centred square

For a square crop from the middle of a landscape image, work out the starting point with one sum: take the image width, subtract the crop size, and divide by two. For a 1200 by 800 image, a square of 800 starts at (1200 minus 800) divided by 2, which is 200. Enter X 200, Y 0, width 800 and height 800. For a 3000 by 2000 image, a square of 2000 uses X 500, Y 0, width 2000 and height 2000.

For a portrait image, do the same sum on the height instead and keep X at 0.

3. A square profile picture

Any time you need a square, make the width and height equal. If you then need a specific size such as 400 by 400, run the result through the Image Resizer afterwards.

Finding the right numbers

You need to know the image's size in pixels to choose sensible values. On Windows, right-click the file, choose Properties and open the Details tab. On a Mac, open it in Preview and choose Tools, then Show Inspector. On a phone, the Photos app usually shows the dimensions in the info panel. Because the crop must fit inside the image, it helps to write the width and height down first.

Common mistakes

A crop that runs off the edge. If X plus the width is larger than the image width, or Y plus the height is larger than the image height, the tool stops with a Crop area exceeds image bounds message. Reduce the numbers and try again.
Mixing up X and Y. X is sideways and Y is downwards. If the crop lands in the wrong place, check you did not swap them.
Leaving width or height empty by accident. An empty width or height becomes half of the image's width or height, which is rarely what you meant.
Cropping when you meant resizing. Cropping removes part of the picture. Resizing keeps everything and changes the dimensions. Use the Image Resizer for that.

Cropping and quality

Cropping does not stretch or shrink anything. It simply keeps a smaller rectangle of the same pixels. A cropped PNG is saved as a PNG and a cropped WebP as a WebP. JPG is a lossy format, so a re-saved JPG can differ very slightly in file size, but the crop is saved at high quality.