Create a Black and White Signature
Force a signature to pure black with no grey in between. The cleanest option for stamps, engraving, and single-ink printing.
Free preview · No signup · ~10 seconds
Drop a scanned signature — image or 1-page 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 a threshold does to a signature
One cut-off, two outcomes
Every pixel is compared against the threshold you set. Darker becomes black, lighter becomes nothing. There is no in-between value left in the file, which is what some manufacturing processes require.
Where to put the cut-off
The default of 170 sits high on purpose. Ink is thinner than it looks, and a threshold in the middle of the range eats the faint ends of strokes. Raise it to keep more of the signature; lower it if paper texture is coming through as speckles.
Why processes demand two tones
Rubber stamp cutting, laser engraving and single-ink screen printing have no way to express a grey. They either cut or they do not. Handing them an image with soft edges means someone else decides where the boundary falls, and that decision is usually worse than yours.
The trade-off
Thresholding removes the anti-aliasing that makes a signature look natural on screen, so the result has visibly hard edges. That is correct for manufacturing and wrong for a PDF. Use Black Ink instead when the signature will be viewed rather than cut.
Cleaning a poor scan
A threshold is also the fastest way to rescue a grubby scan. Paper discolouration and scanner noise sit well above the cut-off and vanish entirely, leaving only the ink.
How to create a black and white signature
Upload the signature
Drop in a scan or photo. Higher resolution gives a smoother edge after thresholding. 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 the slider until the full signature is present but paper speckle 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 signature is required
Rubber stamps
Supply a signature in the two-tone form stamp manufacturing actually needs.
Laser engraving
Give the cutter an unambiguous boundary rather than letting it guess at grey.
Single-ink printing
Prepare artwork for processes that lay down one colour and no halftone.
Cleaning a bad scan
Erase paper discolouration and scanner noise in one 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.
Frequently Asked Questions
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Make a two-tone signature
Upload, set the threshold, and download pure black and white.