Signature Background Remover

A signature you photographed on paper is mostly paper. Dropping that grey, shadowed rectangle onto a contract looks exactly like what it is. This keeps the ink and throws the page away, giving you a transparent PNG you can put on a document, an email footer, or anywhere else. It runs on your device — your signature is never uploaded, which matters more for this file than almost any other you own.

How to use it

1. Sign a blank sheet of white paper in dark ink, and photograph it in even light. Daylight near a window is ideal; overhead light that casts your hand's shadow across the page is the one thing to avoid.
2. Add the photo. The tool works out where ink ends and paper begins by measuring your image rather than assuming a background colour, so a slightly grey or yellow page is fine.
3. Check the preview. If a faint stroke is missing, or a shadow survived, move the slider until it looks right.
4. Optionally set the ink to solid black or blue, which evens out a photograph taken under warm light.
5. Save. The result is cropped to the writing, so it stays legible when you scale it down.

Examples

• A signature photographed on a phone, cleaned up and placed on a rental agreement
• A blue-ink signature turned into a transparent PNG for an email footer
• A scanned signature tidied before being added to a PDF with the editor

What this tool cannot do

• It keeps what is dark and drops what is light. A signature in pale pencil on grey paper has little for it to separate, and no tool can invent the difference.
• A shadow across the page reads as ink, because it genuinely is darker. If the result comes out as a slab, retake the photo in even light — the tool will tell you when it sees this.
• It does not verify anything. This produces a picture of your signature, not a digital signature, and it carries no cryptographic proof of who signed or when.

Frequently asked questions

Why does my signature come out as a black rectangle?

Almost always a shadow. If your hand or phone cast a shadow across the paper, part of the page is genuinely darker than the rest, and the tool cannot tell that from ink. Retake the photo with the light coming from in front rather than behind you, or move the slider left so only the darkest strokes are kept. The tool says so when it detects this rather than handing you the rectangle and letting you work it out.

Do I need a scanner?

No. A phone photo is what this is built for. A scan is cleaner and will give a slightly better result, but the whole point of measuring the threshold from your image rather than assuming a white background is that a photograph — with its gradient, its colour cast and its slightly-off-white paper — works too.

Can I change the ink colour?

Yes, to solid black or solid blue. It is worth doing when the photo was taken under warm indoor light, which tints black ink brown. Leaving it as photographed keeps the natural variation in the stroke, which looks more like a real signature and less like a font.

Is my signature uploaded anywhere?

No. The photo is opened and processed by your own browser and nothing is transmitted. This page is served with a rule that forbids it from sending anything anywhere, which you can check with curl before you trust us — see the page on checking our claims. Of all the files this site handles, a signature is the one where that matters most: it is the thing someone would need to forge a document in your name.