Background Remover
Keys out a flat or single-colour background in OKLab and returns a transparent PNG, with a brush for fixing the edges.
This is a chroma key and a border flood fill, not a matting model — which is exactly the right tool for a product shot on white, a portrait on a plain backdrop, or green screen, and exactly the wrong one for a person with loose hair against a busy background.
Drop a product shot, a portrait on a flat backdrop, or a green screen
Runs in this tab. The output is a PNG with a real alpha channel.
How to use it
Pick flood or chroma
Flood takes only background connected to the frame edge, so a white shirt in the middle of a white-backdrop photo survives. Chroma takes the key colour everywhere, which is what green screen needs.
Leave the key colour on automatic
It takes the median of the border pixels — the median, not the mean, so an arm running off the edge does not drag the value.
Set the tolerance, then ignore lightness if needed
Tolerance is a ΔE in OKLab. Raise “ignore lightness” for a green screen with shadows on it; lower it to separate white from light grey, where lightness is the only difference there is.
Shrink the edge by a pixel if there is a fringe
That removes the light halo left when the background was brighter than the subject. Those boundary pixels are a genuine mixture of the two.
Common questions
Why can it not do hair?
A pixel at a hair edge is part subject, part background, and separating them means solving three unknowns from one observation. The tools that do it well are trained networks with tens of megabytes of weights, and there is no arithmetic substitute.
It punched a hole in the subject.
Chroma mode removes the key colour wherever it appears, including on the subject’s clothing. Switch to flood, which only removes background reachable from the frame edge.
Why is the output always PNG?
Because the entire output of this tool is an alpha channel, and JPEG does not have one. Saving a cutout as JPEG composites it back onto a colour, which undoes the work.
Feed it from
Subject Cutout
Cuts a person or an object out of an ordinary photo with an on-device segmentation model, and returns a transparent PNG with a soft, decontaminated edge.
Transparency Tools
Trims transparent borders, flattens alpha onto a chosen colour, or extracts the alpha channel as a mask.
ID Photo Maker
Crops a portrait to the ID and passport sizes of Korea, Japan, China, Spain, Mexico and the US visa, swaps the background and lays out a print sheet.
Signature Extractor
Turns a photo of a signature on paper into a clean transparent PNG, removing shadows and paper texture.
Next
These accept what this tool produces, so the result can go straight in.
ID Photo Maker
Crops a portrait to the ID and passport sizes of Korea, Japan, China, Spain, Mexico and the US visa, swaps the background and lays out a print sheet.
Transparency Tools
Trims transparent borders, flattens alpha onto a chosen colour, or extracts the alpha channel as a mask.
Border & Padding
Adds a solid, gradient or rounded border and padding around an image, or pads it to a target ratio.
PNG Compressor
Quantises the palette and rewrites the deflate stream to shrink a PNG without changing its dimensions.
EXIF Remover
Strips camera, GPS and editing metadata from photos while leaving the pixels untouched.
Favicon Generator
Produces the whole favicon set — ICO, PNGs, Apple touch icon, web manifest — plus the HTML to paste.