How to remove the background from a photo with OnyxPDF
- Drop a photo into the tool.
- On first use only, the AI model (~85 MB) downloads to your device — watch the progress bar; afterwards it is cached and works offline.
- Choose the result background: transparent, white, or a custom colour.
- Click “Remove Background”, wait while your device runs the model, and download the PNG.
Why do it in your browser instead of uploading?
- Full resolution, free: no 0.25 MP “preview” downgrade and no per-image credits — the remove.bg pricing model does not exist here.
- Your photo is never uploaded: the model downloads to the photo, not the other way round — the private way to cut out product shots and portraits.
- Solid-background mode built in: white for marketplace listings, any custom colour for design work.
- Works offline after the first download — the model and engine are cached on your device by the service worker.
Good to know (honest limits)
- First use downloads ~85 MB (model + engine) — on a slow connection that takes a while; it happens once and is cached afterwards.
- On-device inference is slower than a server GPU: expect seconds on a desktop, potentially a minute or more on a weak phone. The progress display tells you which stage you are in.
- Fine hair and fur edges are softer than the best server tools (remove.bg’s model is their whole product). Clear subjects with distinct backgrounds give the cleanest cut-outs.
- One photo at a time — batch background removal would multiply the on-device processing time.
Frequently asked questions
How can background removal work without uploading my photo?
The AI model (ISNet, about 85 MB with its engine) is downloaded to your browser once and cached; inference runs locally as WebAssembly. Your photo itself is never sent anywhere — open the Network tab and check.
How does the quality compare to remove.bg?
For clear subjects — people, products, pets — results are genuinely good. remove.bg keeps an edge on very fine hair and complex edges, and it is faster (server GPUs). In exchange, this is free at full resolution and completely private.
Why is the first use slow to start?
The ~85 MB model must download once. After that it is cached on your device, later runs start immediately, and the tool even works offline.
Can I put the subject on a white or coloured background?
Yes. Choose White or Custom colour in the tool and the result is composited onto that background instead of transparency — handy for Amazon/eBay-style listing photos.