usefulweb.site Background Remover

Audio, video & images

Background Remover

Remove plain backgrounds from product photos and logos (colour-based, no AI) → transparent PNG.

JPG, PNG, WebP, AVIF, GIF, TIFF or HEIC, max 50 MB. Best results: the subject on a plain, evenly lit background.

Hex colour, e.g. #ffffff or #00ff00. Required for the two colour methods; ignored by the automatic method.

%

How different a pixel may be from the background colour and still be removed. Raise it for shadows or JPEG noise; lower it if parts of the subject disappear.

px

Removes isolated specks and fills small holes in the mask (morphological open/close). 0 = off.

px

Softens the cut-out edge. 0 = hard edge.

Try an example: Red square on white (automatic) · Chroma key: remove white everywhere

How it works

Makes the background of an image transparent by colour: it estimates the background colour from the image border and removes it with an adjustable tolerance, or removes one colour everywhere (chroma key / green screen). Works well for product photos, logos and scans on plain backgrounds; it does NOT understand people or complex scenes, because it uses no AI model.

  • This is NOT an AI background remover. It decides per pixel by colour distance only, so it works for a subject on a plain, evenly coloured background (product shots, logos, scans, green screen) and fails on busy scenes, hair, or subjects with the same colour as the background.
  • Automatic mode shrinks the image to 200×200 px and takes the per-channel median of a 3-pixel border ring as the background colour. The share of border pixels within the tolerance ("border uniformity") predicts how well the method will work.
  • Edge-connected modes add a 1-pixel frame in the background colour and flood-fill from it with ImageMagick (-fuzz, -floodfill), so only background regions touching the edge are removed and same-coloured areas inside the subject stay. Chroma-key mode removes every pixel close to the colour, wherever it is.
  • The resulting mask is cleaned with a morphological open (removes specks) and close (fills pin holes) using a disk of the chosen radius, optionally blurred to feather the edge, and used as the alpha channel of a PNG.
  • Existing transparency is flattened onto white first. Colour tolerance is a root-mean-square distance over R, G and B relative to the full 0–255 range.

Colour-based removal is approximate. Check the edges in the preview; for portraits or complex scenes use an AI tool or manual masking.

For scripts and AI agents

  • JSON API: POST https://backgroundremover.usefulweb.site/api/v1/calculate (same calculation as this page)
  • Interface description: OpenAPI 3.1 · AI guide: llms.txt
  • MCP server (Streamable HTTP): https://backgroundremover.usefulweb.site/mcp · tool name background_remover
Example request
curl -s -X POST https://backgroundremover.usefulweb.site/api/v1/calculate \
  -H 'content-type: application/json' \
  -d '{"file":{"filename":"product.png","contentType":"image/png","contentBase64":"iVBORw0KGgoAAAANSUhEUgAAACAAAAAgAQMAAABJtOi3AAAABlBMVEX/////AADrWueTAAAAEklEQVQI12NgIBb8/09dgjgAAPcnH+GApkH4AAAAAElFTkSuQmCC"},"mode":"auto","fuzz":10,"cleanup":1,"feather":0}'

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