# Free AI Background Remover > An AI background remover is an online tool that detects the subject of a photo, deletes the background in a few seconds and returns a transparent PNG. Kenerate AI's remover is free to start: new accounts get free credits, downloads have no watermark, and Cutout HD handles hair, fur and glass. URL: https://kenerateai.com/free-ai-background-remover Publisher: Kenerate AI (https://kenerateai.com) Last updated: 26 September 2026 ## Key facts - Fine edges: Cutout HD for hair, fur and glass - Free to start: Free credits on sign-up, no watermark - Formats: JPG, PNG, WEBP in → transparent PNG out - Modes: Cutout · Cutout HD · Object Pick · Magic Eraser ## Steps 1. Add a photo — Upload a JPG, PNG or WEBP, or pick one of the sample photos. People, products, pets, logos and signatures all work. 2. Pick how to cut — Cutout is fast, Cutout HD takes extra care with hair, fur and glass, Object Pick keeps only what you describe, and Magic Eraser removes something you paint over. 3. Download or restyle — Download a transparent PNG, or put the cut-out on white, black, any colour, a gradient, a blur of the original or another photo. ## In depth ### The alpha channel A transparent PNG works because of an idea from 1984: Thomas Porter and Tom Duff at Lucasfilm proposed storing a fourth “matte” value — alpha — with every pixel, and defined how to lay one image “over” another [1]. A background remover's job is to compute that alpha for every pixel: 1 for the subject, 0 for the background, and something in between at soft edges. ### Why edges are the hard part Every pixel is a mix: colour = α × foreground + (1 − α) × background. For a colour photo that is three equations with seven unknowns per pixel, so there is no unique answer without extra assumptions — the “matting problem” [2]. Early tools asked you to draw a trimap (definitely subject, definitely background, unknown); Adobe's Deep Image Matting (2017) fed that trimap to a neural network [3]. ### The models behind one-click removal Modern removers need no trimap. U²-Net (2020) finds the salient object at many scales at once [4]; MODNet does real-time portrait matting from a single photo [5]; IS-Net and its high-resolution DIS5K dataset (2022) pushed fine-detail segmentation [6], and BiRefNet (2024) adds a second pass that recovers detail from image patches [7]. Meta's Segment Anything (2023) returns a mask from a click or a box — but as hard masks, not soft alpha [8]. ### Hair, fur and glass Fine strands cover only part of a pixel, so their alpha sits between 0 and 1 and their colour is mixed with the background — exactly the hard case of the matting equation [2]. Glass is harder still: researchers showed back in 1999 that one alpha value can't describe glass that bends or reflects light [9]. That's why Kenerate's Cutout HD spends extra effort on these edges — and why a see-through bottle is kept as a slightly transparent cut-out rather than a solid shape. References: [1] Porter & Duff — Compositing Digital Images (SIGGRAPH 1984): https://dl.acm.org/doi/10.1145/800031.808606 [2] Levin, Lischinski & Weiss — A Closed-Form Solution to Natural Image Matting (TPAMI 2008): https://webee.technion.ac.il/people/anat.levin/papers/Matting-Levin-Lischinski-Weiss-PAMI.pdf [3] Xu et al. — Deep Image Matting (CVPR 2017): https://arxiv.org/abs/1703.03872 [4] Qin et al. — U²-Net (Pattern Recognition 2020): https://arxiv.org/abs/2005.09007 [5] Ke et al. — MODNet: trimap-free portrait matting (AAAI 2022): https://arxiv.org/abs/2011.11961 [6] Qin et al. — Highly Accurate Dichotomous Image Segmentation / DIS5K (ECCV 2022): https://arxiv.org/abs/2203.03041 [7] Zheng et al. — BiRefNet (2024): https://arxiv.org/abs/2401.03407 [8] Kirillov et al. — Segment Anything (Meta AI, 2023): https://arxiv.org/abs/2304.02643 [9] Zongker et al. — Environment Matting and Compositing (SIGGRAPH 1999): https://dl.acm.org/doi/10.1145/311535.311558 ## FAQ Q: Is the Kenerate background remover free? A: Yes to start: every new account gets free credits to test it, with no watermark. After that you use one-time credit packs — no subscription required, and credits don't expire. Q: What is the difference between the four modes? A: Cutout is fast and suits products and simple outlines, Cutout HD takes extra care with hair, fur and glass, Object Pick keeps only what you describe, and Magic Eraser removes something you paint over. Q: Is there a watermark on the result? A: No. Downloads from free and paid credits are the same clean PNG, with no watermark. Q: Which mode should I use for hair and fur? A: Use Cutout HD. It spends more effort on fine edges like flyaway hair, pet fur, lace, smoke and glass. The standard Cutout is best for products and simple outlines. Q: Can I keep just one object and remove everything else? A: Yes. Object Pick lets you type what should stay — “the woman in the white dress”, “the red car”, “the dog on the left” — and removes everything else, including other people or animals. Q: How do I get a white background instead of a transparent one? A: After the cut-out, choose a white backdrop before you download. You can also pick black, any colour, a gradient, a blurred version of the original or another photo — or open it in Edit Studio to generate a new AI scene. Q: What file types can I upload? A: JPG, PNG and WEBP. Cutout HD accepts files up to 10 MB. The result downloads as a PNG with a transparent background. Q: Can I use the cut-outs commercially? A: Yes. You own your results and can use them in product listings, ads, thumbnails and client work. Q: Is my photo private? A: Your uploads and results are saved to your own private history so you can download them again. Q: What happens to remove.bg on 1 December 2026? A: remove.bg says its website closes at 9:00 AM CET that day and its background removal moves to Canva; the self-service API moves to Leonardo.Ai and pay-as-you-go credits expire. Kenerate works the same before and after that date. ## Related pages - Transparent background maker: https://kenerateai.com/transparent-background-maker - Free PNG maker: https://kenerateai.com/png-maker - White background: https://kenerateai.com/white-background - Remove white background: https://kenerateai.com/remove-white-background - Black background: https://kenerateai.com/black-background - Transparent logo: https://kenerateai.com/remove-background-from-logo - Signature PNG: https://kenerateai.com/remove-background-from-signature - Remove shadow: https://kenerateai.com/remove-shadow-from-photo - Remove glare: https://kenerateai.com/remove-glare-from-photo - Remove text: https://kenerateai.com/remove-text-from-image - Make an image transparent: https://kenerateai.com/how-to-make-an-image-transparent - Remove background in Canva: https://kenerateai.com/how-to-remove-background-in-canva - Remove background in Photoshop: https://kenerateai.com/how-to-remove-background-in-photoshop - Remove background in GIMP: https://kenerateai.com/how-to-remove-background-in-gimp - Remove background on iPhone: https://kenerateai.com/how-to-remove-background-on-iphone - Remove a person from a photo: https://kenerateai.com/how-to-remove-a-person-from-a-photo - All background remover alternatives: https://kenerateai.com/background-remover-alternatives - remove.bg alternative: https://kenerateai.com/remove-bg-alternative - Photoroom alternative: https://kenerateai.com/photoroom-alternative - Pixelcut alternative: https://kenerateai.com/pixelcut-alternative - Canva BG Remover alternative: https://kenerateai.com/canva-background-remover-alternative - Adobe Express alternative: https://kenerateai.com/adobe-express-background-remover-alternative - erase.bg alternative: https://kenerateai.com/erase-bg-alternative - removal.ai alternative: https://kenerateai.com/removal-ai-alternative - Picsart alternative: https://kenerateai.com/picsart-background-remover-alternative - Pixlr alternative: https://kenerateai.com/pixlr-background-remover-alternative - Clipping Magic alternative: https://kenerateai.com/clipping-magic-alternative - PhotoScissors alternative: https://kenerateai.com/photoscissors-alternative - PicWish alternative: https://kenerateai.com/picwish-alternative - Slazzer alternative: https://kenerateai.com/slazzer-alternative - Fotor alternative: https://kenerateai.com/fotor-background-remover-alternative ## Sources - remove.bg — API page (move to Leonardo.Ai): https://www.remove.bg/api - remove.bg — Pricing (credits expire 1 Dec 2026): https://www.remove.bg/pricing