How to Remove a Photo Background (and When Colour Removal Fails)

A transparent background lets a product, logo or portrait sit on any colour. Removing one sounds like a job for artificial intelligence, but for plain backgrounds a much simpler method works well, and it is worth understanding because it also tells you when it will fail.

How the tool works

The Background Remover is a colour-based tool, not AI. It reads the colour of the background around the edge of your picture, then removes the connected area that matches that colour within a tolerance you set. The result is a transparent PNG at the original size. It processes the image in your browser and nothing is uploaded.

Because it matches colours rather than recognising objects, it behaves predictably:

• On a solid or near-solid background it can give a clean cutout in seconds.
• On a cluttered background, such as a busy room or a patterned cloth, it cannot tell the subject from the background, and the result is poor.

The settings

• Tolerance. How close to the background colour a pixel must be to be removed. Raise it to remove shaded or uneven backgrounds, such as a white sheet that turns grey at the edges. Lower it if parts of your subject start to disappear.
• Only remove background connected to the edges. Leave this on to keep colours inside the subject. A white shirt on a white wall will lose its shirt if you turn it off, but with it on only the wall, which touches the edge, is removed.
• Soften the edge. Slightly smooths the cut to avoid a harsh outline.

Use the checkerboard preview to judge the result. Transparent areas show as a pattern, so any missed background is easy to see.

Photos that work well

• Product photos on a white or grey sweep.
• Logos and graphics on a flat colour.
• Studio portraits against a plain backdrop with even light.
• Scanned signatures on white paper, as a way to place them on documents.

Photos that do not

• Subjects the same colour as the background, such as a white mug on white.
• Backgrounds with texture, gradients, shadows on the floor or reflections.
• Fine detail such as hair or fur against a similar colour. Edges will look rough.

Shoot for easy removal

1. Use a plain background that contrasts with the subject. Avoid colours that appear in the subject.
2. Light the background evenly so it is one colour, not a gradient.
3. Keep the subject away from the background to reduce shadows.
4. Photograph at the resolution you need, because you cannot add detail later.

After the cutout

The PNG keeps transparency. To place it on a new background, use a design or slide tool. To shrink it for a website, the Image Compressor or PNG to WebP keeps transparency while reducing size, whereas JPG does not support it. If you later need a JPG with a coloured background, PNG to JPG lets you choose the fill. To fit marketplace sizes, use the Image Resizer, and see PNG vs JPG: when to convert for the format choice.

What to do with a cluttered photo

Retake the photo against a plain background if you can. If you cannot, use the Image Cropper to cut out the area around the subject so the clutter is smaller, or use a dedicated manual editing program for a precise cut. Be honest about the limits: no colour-based tool will do a perfect job on a busy scene.