Background removal used to mean an hour in Photoshop. Modern ML models do the same work in seconds, and the best ones now run entirely in your browser — no upload, no subscription.
What the model actually does
It segments the foreground subject from the background by predicting a per-pixel mask. The mask is then applied to produce a transparent PNG. Quality depends heavily on subject-background contrast.
Where it struggles
Wispy hair, transparent objects (glass, smoke), and busy backgrounds that match the subject's color. For these, run the tool, then touch up the edges in an image editor.
Composite onto a new background
After removal, drop the transparent PNG onto a solid color, gradient, or new photo to build product shots, headshots, or social graphics without studio lighting.