Overview
Introduction
This tool recolors a digital stamp's ink entirely client-side, letting you match a stamp graphic to a new brand color or document theme without reaching for a full image editor.
It works by tolerance-matching a source color, so it handles minor shading variation in scanned or photographed stamps, not just flat vector fills.
What Is Stamp Color Changer?
A client-side color-replacement tool built on Euclidean RGB distance matching, so a tolerance of 0 only matches an exact color while larger values catch anti-aliased or slightly-varied shades of the same ink.
It's the same recoloring operation used by this site's general PNG colors changer, applied to the stamp use case.
How Stamp Color Changer Works
Every pixel's RGB distance to your chosen source color is computed; pixels within the tolerance you set are replaced with the target color while their original alpha is preserved.
Pixels outside the tolerance band pass through completely unchanged, so backgrounds, transparency, and unrelated colors in the same image stay intact.
When To Use Stamp Color Changer
Use it to match a black ink stamp to a brand's accent color, or to recolor a seal or signature stamp for a themed document.
It's also useful for creating multiple color variants of the same stamp asset for different templates.
Often used alongside Stamp to Single Color Converter, Black and White Stamp Creator and Rubber Stamp to Digital Stamp Converter.
Features
Advantages
- Runs entirely client-side; the uploaded stamp is never sent to a server.
- A tolerance slider handles natural shading variation in scanned or photographed ink.
- Alpha (transparency) is always preserved, so the stamp's silhouette stays intact.
Limitations
- Only one source color is recolored per pass; multi-color stamps need multiple passes.
- A tolerance set too low can leave a visible ring of the old color around anti-aliased edges.
Examples
Best Practices & Notes
Best Practices
- Sample the stamp's actual ink color with an eyedropper before entering the 'change from' value for the most accurate match.
- Preview at 100% before downloading to check for leftover fringing at edges.
Developer Notes
The color-distance replacement math lives in the shared png-colors-changer lib function; this tool's lib file is a thin, documented wrapper around it rather than a re-implementation.
Stamp Color Changer Use Cases
- Matching a signature stamp to a company's brand palette
- Producing colored variants of the same seal graphic
- Recoloring a scanned rubber stamp impression for a themed template
Common Mistakes
- Choosing a tolerance so high it also recolors unrelated dark shadows in the image.
- Forgetting that only exact-format 6-digit hex colors are accepted for both the source and target.
Tips
- Run the tool twice with different source/target pairs to recolor a two-tone stamp.
- Combine with the black and white stamp creator first if you want a clean, uniform ink color to recolor from.