Signature background remover

Make the bright background of a signature photographed or scanned from paper transparent and save it as a PNG

Drag a file here or click to chooseJPG, PNG, WebP · 20 MB · 24 MP · maximum side 8,192 px · Up to 20MB · You can also paste (Ctrl+V)

Result

Choose an image, then process it.

Files are processed only on this device and are never uploaded to a server. How it works

Signature strokes on a transparent background

[data-tool-illustration] > img { display: none; }

How to use

Make the bright background of a signature photographed or scanned from paper transparent and save it as a PNG. Pixels at or above the brightness threshold (1–255) become transparent; raising it keeps more pale strokes, lowering it removes more background. You can turn the remaining strokes black and crop the margins to the smallest rectangle around them.

Scope and limitations

This is a brightness filter, not AI removal of shadows, colored paper, ruled lines or complex backgrounds. Pale strokes can disappear, so inspect the transparent result closely. If all pixels disappear, increase the threshold and process again.

Input one JPG, PNG or WebP, up to 20 MB, 24 MP and 8,192 px per side. Only the first animation frame is processed; HEIC and SVG are not supported. After changing settings, process the image again before saving a new result.

Processing requires a current browser with OffscreenCanvas support.

Frequently asked questions

Is the original file modified?

No. The tool saves a separate result file without overwriting the selected original.

What if a large image fails to open?

Resize the image first and select it again. Low device memory may prevent processing even within the limits.