How to turn a signature on paper into a digital signature with your iPhone

You’ve signed your name the same way for twenty years. It’s on your passport, your bank card, the back of every cheque you’ve ever written. So when a form asks for a signature on screen, drawing a fresh one with your fingertip feels wrong — because it is a different signature.

The fix is to start from the paper. Sign a blank sheet, photograph it, and turn that photo into a digital signature you can reuse. Here’s how far the free tools get you, and exactly where they stop.

Step 1: sign the paper properly (this is most of the job)

Nearly every bad digital signature is a bad photograph. Two minutes here saves an hour of fiddling later.

Plain white, unlined paper. Lines get captured as ink and you’ll be erasing them by hand afterwards.
A dark pen with a thick nib. Black or dark blue, gel or rollerball. A fine ballpoint lays down thin grey strokes that any cutout tool will chew holes in.
Sign big. Fill a good third of the page. You can always scale a signature down; you cannot invent detail that the camera never resolved.
Sign it three or four times. They’ll differ, and one of them will be the one you actually like. Pick that one.
Flat surface, even light, no shadow. Daylight near a window beats a ceiling light directly overhead, which throws your own shadow across the page.

Now photograph it. Hold the phone square to the paper — parallel, not tilted — and get close enough that the signature fills the frame.

Step 2: the free route, and the exact point it runs out

Your iPhone already has good capture tools:

Notes → Scan Documents (or Files → ⋯ → Scan Documents) detects the paper’s edges, straightens the page and cleans up the contrast. It’s built for full pages, so it may hunt around for edges on a mostly-blank sheet, but when it locks on, the output is far flatter and cleaner than a plain photo.
The plain Camera app, then crop tight in Photos. Simpler, and it works when the scanner won’t lock on — but you keep whatever grey cast and shadow the room gave you.

Either way you now have a picture of a sheet of paper. That’s not yet a signature you can use, for two reasons.

First, the background. Drop that image onto a document and you get a white — or worse, greyish-cream — rectangle sitting on top of the signature line, hiding it. You need the paper gone and only the ink left, which means a transparent PNG. That’s a whole craft of its own, and we’ve written it up separately: how to make a transparent signature PNG covers the background removers, the magic-wand route, and the halo problem to watch for at the edges. (If you’re tempted by Photos → long-press the subject to lift it out: try it, but check what you got. Subject lift looks for a salient object, and on this image the object it finds is usually the sheet of paper, not the strokes on it.)

Second — and this is the limit nobody mentions — iOS Markup cannot import a signature image at all. Markup’s signature tool is draw-only. The path is pencil (Markup) icon → + → Signature → Add or Remove Signature → +, and what you get is a blank line and your finger. There is no “choose from Photos”, no import, nothing that turns your photographed signature into one of Markup’s saved signatures. Markup’s Text tool types, and its signature tool draws, and neither of them takes an image.

So the free route on iPhone can get you a photo of your signature, and with some work a transparent PNG of it. What it cannot do is register that as a reusable signature you can drop onto the PDF your landlord just emailed. On a Mac, Preview has an equivalent camera-capture feature and this is much easier; on iPhone alone, that bridge doesn’t exist.

That gap is the entire reason a signing app has a job here.

Step 3: capture it as a signature you can reuse

Signed is built around this exact problem. Its signature studio has four tabs — Draw, Type, AI and Scan — and Scan is the one that starts from paper:

Open the Scan tab. It offers three sources: Camera (photograph the sheet in front of you now), Photos (a picture you already took), or Files (an image or a PDF you were sent).
The photo appears immediately, untouched. Tap the wand.
It cleans the capture on your iPhone: Vision finds the paper, straightens it, applies the same lighting enhancement the system scanner uses, then lifts the ink onto a transparent background and crops in tight. What you see in the preview is exactly what gets saved — it isn’t re-processed afterwards.
Your ink keeps its own colour. Sign in blue and it stays that blue, rather than being flattened to black. If you’d rather change it, the ink swatches retint it instantly.
Save it. It’s now in your signature locker next to your initials, ready for every document after this one.

All of that runs on the device — there’s no upload step and no server copy, which is the same local-first rule the rest of the app follows. Signed is free to download with the first signature free; unlimited signing is a paid subscription.

Two honest notes. The Scan tab uses a plain camera, not Apple’s document scanner — the document scanner hunts for page edges that a lone signature on a blank sheet doesn’t have, and then asks you for the next page. And the cleanup is good, not magic: a thin grey ballpoint scrawl photographed under a ceiling light will come out patchy no matter which tool processes it. Step 1 is still where the quality comes from.

Which of the three routes you actually want

Capturing from paper is one of three ways to get a signature, and it isn’t automatically the best one:

Capture from paper (this page) — when you have a signature you already use and want the digital one to match it. Best authenticity, most setup.
Draw it on screen — fastest, free, no paper involved. A fingertip is blunter than a pen, though there are real tricks for making a drawn signature look less shaky.
Type it and pick a handwriting style — the most consistent and the least like you. Fine for internal forms; obvious on anything a person will actually look at.

If you’re weighing all three at once, the full comparison of ways to create an electronic signature on iPhone puts them side by side. And if what you’re really trying to sign is a scan of a document rather than a blank sheet, that’s the other way round — see how to sign a scanned document on iPhone.

One thing this page is deliberately not about

Whether a photographed signature is accepted on a particular document is a different question from how to make one, and it doesn’t have a single answer — it depends on the document and where you are. For everyday paperwork, an image of your signature on a PDF is ordinary and unremarkable. For anything with real legal weight, check what your counterparty or jurisdiction requires; some documents need a notary or witnesses regardless of how the signature was made. Signed is a signing tool, not legal advice.