How to Remove a Background from a Photo (For Free, No Sign-Up)
A step-by-step guide to removing a background automatically with AI, or manually with an eraser — and downloading a transparent PNG.
There are two very different ways to remove a background: automatic tools powered by a trained AI model, and manual tools where you choose what gets erased. Convorae's Remove Background gives you both, running entirely in your browser — this guide covers when to use each.
Automatic Remove: one click, AI-powered
Automatic mode runs an on-device AI segmentation model (BiRefNet) that detects the main subject and cuts out the background for you — no clicking required. It downloads the model once (cached afterwards) and runs fully in your browser, so your photo is never uploaded. It's a good starting point for most photos, including trickier edges like hair, but on detailed illustrated art or backgrounds that share colours with the subject it can occasionally misjudge part of the image — that's when Manual mode is the better tool.
Manual Remove: exact control
Manual mode is a click-to-erase eraser: you click the areas you want to erase, and it makes matching pixels transparent, either the connected region under your click (magic wand) or every pixel of that colour anywhere in the image (colour key). It takes more clicks, but gives you pixel-exact control — ideal for solid or simple backgrounds, or for touching up spots Automatic mode got wrong.
Start with the magic wand
In Manual mode, click anywhere on the background. The tool selects the connected area of similar colour and erases it. Raise the tolerance slider if the click leaves speckles of background behind; lower it if the selection starts eating into your subject.
Use colour key for scattered backgrounds
If the background colour repeats in several disconnected spots (through gaps between hair or fingers, for example), switch to colour key mode — it removes every matching pixel in the whole image in one click, not just the connected area.
Clean up the edges
Turn on 'Soften edges' to reduce a jagged, cut-out look along the boundary in Manual mode. Made a mistake? Undo the last click, or reset to start over completely — nothing is final until you download.
Which photos work best — and which fight back
Automatic removal works best when the subject stands out clearly from the background: a person against a plain wall, a product on a contrasting surface. It struggles when colours match (a white product on a white background), with transparent or reflective objects like glass, and with very busy backgrounds behind fine detail like hair or fur. For those, start with Automatic anyway, then fix the problem areas in Manual mode — or shoot the photo against a plainer, contrasting background if you can retake it.
What to do with your transparent PNG
A transparent PNG is a building block: drop the subject onto a clean product background, a coloured banner, a thumbnail or a marketplace listing. If a website or app rejects transparent files or shows them on black, flatten the image onto the background colour you actually want — converting the PNG to JPG with a chosen background colour does exactly that. Keep the transparent version as your master; flatten copies for specific uses.
Honest limits: models, phones and big photos
The automatic model runs on your own device, which is what keeps your photo private — but it is a heavy model. On desktop it runs smoothly; on phones, large photos can strain memory, so for big images on a phone prefer Manual mode or resize the photo down first. The model also downloads once on first use (then it is cached), so the first automatic removal on a slow connection takes a little patience.
Quick tips
- Try Automatic mode first — switch to Manual if the result has a hole in the subject or leftover background.
- The download is a real PNG with a genuine transparent (alpha) channel, not a white or checkered fill.
- Large images are scaled down for smooth processing, so the download resolution may be capped.
- For product photos, shoot against a plain, contrasting background — the cleaner the input, the cleaner the cut-out.
- Check edges at full zoom before publishing; most leftovers are a ten-second manual touch-up.