What's the difference between this and the transparent stamp creator?

They use the same color-key math; this tool's default RGB channel controls are tuned for picking a background color directly, while the transparent stamp creator takes a hex string. Use whichever input style is more convenient.

Does it work on photographs of stamps on a desk?

It works best when the desk or backing surface is a single flat color with even lighting; textured wood grain or uneven shadows will only partially key out.

Will it remove color from inside the stamp's design?

Any pixel inside the stamp that happens to match the background color within tolerance will also be made transparent, so choose a background color that doesn't overlap the stamp's own ink.

Can I adjust how aggressively it removes the background?

Yes, the tolerance value controls the maximum RGB distance considered a match; raise it to catch more shading variation, lower it to protect fine detail near the edges.

Stamp Background Remover - Chroma-Key a Stamp Photo Online

Overview

Introduction

This tool removes a solid-color background from a stamp photo or scan entirely in your browser, producing a clean cutout you can layer over anything.

It's built around simple, predictable chroma-key color matching rather than AI segmentation, so results are easy to reason about and adjust.

What Is Stamp Background Remover?

A client-side background-removal tool that compares every pixel's RGB color to a target background color using Euclidean distance, and makes close matches fully transparent.

It reuses this site's general PNG background remover, applied specifically to stamp photos and scans.

How Stamp Background Remover Works

You pick the background's RGB color (matching the paper, ink pad, or desk surface behind the stamp) and a tolerance.

Every pixel within that tolerance of the target color becomes fully transparent while its RGB values are left unchanged; everything outside the tolerance passes through untouched.

When To Use Stamp Background Remover

Use it right after photographing or scanning a physical stamp, before recoloring or resizing it, so the background doesn't interfere with later edits.

It's also useful for cleaning up stock or archived stamp images that were exported with an opaque backing color.

Often used alongside Transparent Stamp Creator, Stamp Background Adder and Stamp Border Remover.

Features

Advantages

Runs entirely client-side; the uploaded photo is never sent to a server.
Simple RGB + tolerance controls make the result predictable and easy to fine-tune.
Produces a real transparent-background PNG ready for reuse in documents or designs.

Limitations

Chroma-key matching isn't true subject segmentation; textured or unevenly-lit backgrounds only partially key out.
If the stamp's own ink shares a color with the background, those areas will be removed too.

Examples

Remove a white paper background

Input

A stamp photo, target RGB (255, 255, 255), tolerance 32

Output

The stamp with its paper background fully transparent

The default tolerance handles typical scanner lighting variation on plain white paper.

Remove a beige desk background

Input

A stamp photo, target RGB (230, 210, 180), tolerance 25

Output

The stamp cut out from the desk surface

Matching the desk's actual color keeps the tolerance tight enough to preserve fine stamp detail.

Best Practices & Notes

Best Practices

Photograph the stamp against as flat and evenly lit a background as possible before running the tool.
Start with a lower tolerance and increase it gradually while watching the preview.

Developer Notes

The chroma-key distance math lives in the shared png-background-remover lib function; this tool's lib file thinly wraps it and re-exports its ChromaKeyColor type rather than redefining the color-matching logic.

Stamp Background Remover Use Cases

Cutting a stamp out of a phone photo for use in a digital document
Preparing a stamp graphic for layering over letterhead
Cleaning up an old scanned stamp image for reuse

Common Mistakes

Photographing the stamp on a shadowed or gradient background, which chroma-key matching can't fully remove.
Setting the tolerance so high that light parts of the stamp's own ink get erased too.

Tips

Use even, diffuse lighting when photographing a stamp to get the cleanest chroma-key result.
Follow up with the stamp border remover if a thin rim of background color remains after keying.

Stamp Background Remover