Clean Up a Scanned Signature
Turn a messy phone photo or scan of your signature into a crisp, clean image — background gone, ink sharpened — free and in your browser.
Drop a signature to clean
Drag & drop, paste, or pick a photo or scan
PNG · JPG · WebP — cleaned on your device
What 'cleaning' a signature means
A signature captured with a phone or a scanner carries baggage: grey or yellowish paper, shadows, uneven lighting, and pale pen strokes. Cleaning it means stripping all of that away so you're left with crisp dark ink on a transparent (or clean white) background.
This tool does three things at once: it keys out the paper by brightness, deepens the ink with a contrast curve so faint strokes read clearly, and can recolour the ink to a solid black or blue. Then it trims the empty margins so the signature is ready to drop into a document or form.
How to clean a signature
- Open your signature. Drag a photo or scan onto the tool, choose a file, or paste it.
- Remove the paper. Adjust the background threshold until only the ink remains.
- Sharpen the ink. Use the ink-boost slider for faint strokes, and recolour to black or blue if you like.
- Trim and download. Auto-trim cleans up the margins; download a transparent PNG or a white-background JPG.
Start with a good capture
The cleaner the input, the cleaner the output. Sign in dark ink on white paper, fill the frame, and shoot in flat, even light. Then the threshold and ink-boost sliders only need small nudges to get a perfect result.
Signature cleaner: what this tool does
- What it does
- Strips the paper, shadows, and uneven lighting out of a scanned or photographed signature and leaves crisp dark ink on a transparent (or clean white) background, with an option to recolour the ink.
- How it works
- Three things happen in one pass: the paper is keyed out by brightness, a contrast curve deepens faint pen strokes, and the ink can be recoloured to a solid black (#101828) or blue (#153CA0) while keeping its soft alpha edge; auto-trim then crops the empty margins.
- Best export
- A transparent PNG by default, or a white-background JPG when a document or form needs JPG.
Practical tips
- A cleaned signature is the starting point for everything else — signing PDFs and contracts, email sign-offs, certificates, and letterheads — so it's worth getting the capture right once.
- Raising the background threshold removes light shadows along with the paper, but even, flat lighting when you shoot the photo gives a cleaner result than fixing heavy shadows afterwards.
- Recolour to solid black for maximum contrast on a printed form, keep the original colour to look hand-signed, or switch to blue when a document expects blue ink.
More signature tools
Frequently asked questions
Can it remove shadows from a signature photo?
Raising the background threshold removes light shadows along with the paper. Even lighting when you take the photo gives the best result.
Can I change the ink colour?
Yes. Recolour the ink to solid black or blue, or keep the original colour — whichever the document needs.
My pen strokes are too light — can I fix that?
Use the ink-boost slider to deepen faint strokes, and recolour to black for maximum contrast.
Where is my image processed?
The cleanup happens in your browser, so the new file is created on your own device. How any data associated with the tool is handled is described in our privacy policy.
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