Extract a Signature from an Image
Pull a signature out of a photo or scan of a signed document — paper, shadow and ruled lines removed, ink kept and transparent.
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Drop a photo, scan or 1-page PDF of the signed page
PNG, JPG, WebP, SVG or a 1-page PDF — up to 20 MB
Runs entirely in your browser. Your image is never uploaded.
Lifting a signature off a photographed page
Keep the darkest thing on the page
On a signed page the ink is almost always the darkest element. Setting the cut-off just above the paper keeps the signature and deletes everything lighter — the sheet, the shadow and usually the printed line beneath it.
The line under the signature
A printed rule is usually lighter than pen ink, so a well-placed cut-off drops it automatically. If it survives, nudge the cut-off down slightly — and if that starts eating the signature, crop above the line instead.
Shadows are the real enemy
A phone photo of a page held in one hand carries a brightness gradient across the sheet. No single cut-off separates a gradient from ink, so one corner keeps paper while the other loses strokes. Photograph flat, in even light.
Where to start
165 suits a normal ballpoint on white paper. Lower it for pale or pencil signatures; raise it if grey paper texture is coming through as speckle.
Handled entirely on your device
A signed document is sensitive. Everything here runs on a canvas in your browser — the file is never uploaded, transmitted or stored.
Getting a clean extraction
Crop first, always
A tight crop around the signature removes most of the lighting variation before the threshold ever sees it. This one step fixes most bad results.
Even light beats more pixels
A modest photo in flat light extracts better than a high-resolution one with a shadow across the page. Gradients are the failure mode, not resolution.
Crop above a stubborn rule
If the printed signature line will not drop out, crop it away rather than lowering the cut-off until your strokes start to break.
How to extract a signature from an image
Crop to the signature first
Cut away the rest of the document so the threshold only has to deal with one small, evenly lit area. Scanned to PDF instead? A single-page PDF works as well — page 1 is turned into an image in your browser.
Set the cut-off
Raise it until the paper disappears, then stop before the thin ends of strokes start breaking.
Download
Free preview, or the full-resolution transparent PNG in the app.
When you need the signature alone
Reusing your own signature
Lift your signature off a signed page to reuse on future documents.
Email sign-offs
Get a clean transparent mark for the bottom of a signature block.
Contract templates
Build a reusable asset for agreements you send regularly.
Rescuing an old scan
Recover a usable signature from a document scanned years ago.
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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Extract your signature
Crop, set the cut-off, get a transparent PNG.