Kilomill

Kilomill Remove background

Remove the background from a photo

Drop a photo of a person, product or animal and get it back on a transparent or plain background. The AI model runs on your device, so the photo is never uploaded and there is no daily limit.

  • No upload: the AI runs in your browser
  • Full resolution, batch + ZIP
  • No sign-up, no watermark

Drop photos here

or paste from the clipboard · JPG, PNG, WebP, HEIC and more · no upload

First use downloads the AI model (about 140 MB) to this browser, once. After that it starts straight away, even offline. Your photos are never uploaded.

Background
Output format

PNG and WebP keep transparency. JPG cannot, so it gets the background colour (white when Transparent is chosen).

Works best on photos with one clear subject: a person, a product, an animal. Needs WebGPU, available in current Chrome and Edge, and Safari 26 or later. Changing these settings redraws the results instantly.

How it works

  1. Add photos. The first time, the AI model (about 140 MB) is downloaded to this browser and kept there; a progress bar shows how far it is. Next time it starts straight away.
  2. Wait a few seconds per photo. In our test on an Apple M2 Mac in Chrome, photos from 512 × 512 to 4,000 × 3,000 took 3.6–7.8 seconds each; slower graphics chips take longer. The time is shown on each result.
  3. Pick the background and format — transparent, white or any colour; PNG, WebP or JPG. Changing them redraws the results instantly, without running the AI again.
  4. Download each photo, or all of them as a ZIP.

What gives the cleanest result

  • One clear subject that stands out from the background: a person, a product on a table, a pet.
  • Good light and a sharp subject. Very fine hair, glass and smoke are the hardest cases for any background remover.
  • Close-ups where the whole frame is the subject (a texture, the body of an instrument) have no background to remove; the result can look odd.

Why it runs on your device

Most background removers upload your photo to a server, and limit free use with sign-ups, daily caps or small previews. Kilomill runs an open-source model, BiRefNet (MIT licence), in your browser with WebGPU. Your photos stay on your device, results are full resolution, and there is no limit on how many you process. The price is the one-time download and a browser with WebGPU: current Chrome and Edge, and Safari 26 or later. Phones and older computers may be slow or run out of memory.

After removing the background

Need a product photo at an exact size for a marketplace? Download the PNG, then resize it or get it under a size limit. For a website favicon or logo, convert the PNG to ICO.

Updated

Questions and answers

Is it really free and unlimited?

Yes. The work happens on your device, so there is nothing to meter: no credits, daily caps, sign-up or watermark, and results keep the full resolution of your photo (up to 25 megapixels).

Why does it download 140 MB?

That is the AI model and the code that runs it. It is downloaded once from this site and stored in your browser, so later visits start at once and work offline. You can remove it by clearing this site’s data in your browser settings.

Why does it say my browser needs WebGPU?

The model runs on your graphics chip through WebGPU. Current Chrome and Edge on Windows, Mac and ChromeOS, and Safari 26 or later, support it. Without WebGPU the model would need more memory than a browser tab can use.

Are my photos uploaded?

No. The model is downloaded to your browser; your photos are read and processed in the tab and never sent anywhere. You can check this in the Network tab of your browser’s developer tools.

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