Create a Black and White Stamp
Force a seal to pure black with no grey in between — the form manufacturers need for cutting a new rubber die.
Free preview · No signup · ~10 seconds
Drop a stamp or seal — image or PDF
PNG, JPG, WebP, SVG or a 1-page PDF — up to 20 MB
Runs entirely in your browser. Your image is never uploaded.
What thresholding does to an impression
One cut-off, two outcomes
Every pixel is compared against the threshold. Darker becomes black, lighter becomes nothing. No intermediate value survives, which is precisely what a die cutter or a single-ink press requires.
Making a die from an impression
If you are having a new rubber stamp cut from an existing impression, the manufacturer needs unambiguous artwork. Handing them a greyscale scan means someone at the factory picks the cut-off, and they will pick it without knowing which parts of your seal matter.
Where to set it
The default of 150 sits lower than the signature equivalent because a seal has large solid areas rather than thin strokes, so there is more ink to keep and less risk of losing it. Raise it if fine rim text is dropping out, lower it if paper texture is coming through.
What you give up
Thresholding removes the soft anti-aliased pixels that make an impression look real. The result has hard edges and looks manufactured, which is right for a die and wrong for a document. Use Change Stamp Colour when the seal will be viewed rather than cut.
It also rescues a poor scan
Paper discolouration, coffee marks and scanner noise all sit above the cut-off and vanish entirely, leaving just the ink. It is often the fastest way to clean up an old impression.
How to create a black and white stamp
Upload the stamp
Drop in the scan. Higher resolution gives a smoother edge once thresholded. Scanned to PDF instead? A single-page PDF works as well — page 1 is turned into an image in your browser.
Set the threshold
Drag until the whole seal is present but the paper texture has gone. Higher keeps more ink; lower keeps less.
Download
Take a free preview, or download the full-resolution file with one credit.
Where a two-tone seal is required
Cutting a new die
Give the manufacturer artwork with an unambiguous boundary rather than a greyscale guess.
Laser engraving
Supply the two-tone form an engraver needs to know where to burn.
Single-ink printing
Prepare a seal for a press that lays down one colour with no halftone.
Cleaning an old scan
Erase paper discolouration and age marks in a single pass.
Or just ask
Describe the edit in your own words
Type what you want changed and the assistant does it on the canvas — each step lands as a layer you can reopen, so nothing it does is baked in.
No edits yet.
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Make a two-tone stamp
Upload, set the threshold, and download pure black and white.