Describe the backdrop you want and keep a clean edge around hair, fur and glass.
Swapping a background is two problems: cutting the subject out accurately, and lighting the new scene so the composite does not look pasted. BiRefNet handles the matting — it is the current state of the art for hair, fur and semi-transparent edges — and the fill model paints a backdrop that matches the subject's light direction.
For a plain transparent cutout you can stop after the matting step and download a PNG; for a full scene, describe the environment and let the model build it.
Upload the subject photo: Portraits, pets and product shots all work. Even lighting on the subject gives the most convincing composite.
Mask the background: Paint roughly over what you want replaced — the matting pass cleans the edge for you.
Describe the new backdrop: 'Soft grey studio backdrop', 'sunlit kitchen counter', 'city street at dusk'. Naming the light matters more than the scene.
Clean edges on hair: BiRefNet keeps flyaway strands instead of shaving them into a hard outline.
Transparent PNG option: Skip the fill and export with an alpha channel for listings and mockups.
Batch on Pro: Paid plans run a whole product set through the same backdrop in one go.
Is there a free background changer? Signed-in accounts get 10 free credits every day, and new users can try Pro free for 24 hours — cancel anytime.
Can I get a transparent background instead? Yes — the background remover exports a transparent PNG with no fill applied.
Does it work on product photos? Yes, and it is one of the most common uses — one shot, several backdrops for different listings.
Will the subject's lighting be wrong? Describe the light you want ('backlit', 'soft window light') and the fill matches it; mismatched light is usually a prompt problem.