Chroma Key Remover

A green or blue screen only helps if something on the other end can actually cut it out. This tool does exactly that, entirely in your browser: upload a photo shot on a flat, uniformly colored background — a green screen, a blue screen, a solid-color wall, or a product shot on plain white — click once on that background with the eyedropper to sample its exact color, and the tool removes every pixel of that color, leaving a real transparent PNG.

The keying itself is genuine chroma-key math, not a shortcut. Both the sampled key color and every pixel in the photo are converted from RGB into YCbCr color space using the standard broadcast formulas, and the "closeness to the key color" is measured only in the Cb/Cr chrominance plane — luminance (Y) is deliberately ignored. That is exactly what makes real chroma-key hardware and software robust to uneven lighting across the backdrop: a shadow or a slightly brighter patch of green screen still measures as close to the key color, because only its color, not its brightness, is compared. The chroma distance is then mapped to an alpha value with a smoothstep curve between an inner threshold (fully transparent) and an outer threshold (fully opaque), which a single tolerance slider moves together, producing a soft, natural edge instead of jagged pixel-level holes.

Real chroma-key footage almost always has "spill": a rim of the screen's color reflecting onto the edges of the subject, most often as a green or blue tinge along hair or shoulders. This tool includes actual spill suppression, not just a transparency cutout — for pixels near the key color, it pulls the key color's dominant channel toward the average of the other two channels, in proportion to how close that pixel is to being fully keyed out, removing the color cast on real semi-transparent edge pixels rather than leaving a colored fringe.

This is intentionally a chroma-key tool, not an AI background remover: it works because the background is one flat, known color, not because it understands what a person or a product is. Point it at a photo with a busy or gradient background and the result will be poor by design — that is precisely the class of problem AI segmentation solves and this privacy-first, offline tool does not attempt to fake. Pick your key color, adjust tolerance and spill suppression against the before/after checkerboard preview, then download the transparent PNG. Nothing is ever uploaded; the whole pipeline runs on your device's own Canvas 2D and ImageData APIs.