How to Sign a PDF on iPhone — No Printing, No Uploading

Updated: 2026-08-13

You don't need a printer: iPhones can sign PDFs on their own. iOS's built-in Markup places a basic signature and works for quick one-offs. iFiles' Sign PDF tool goes further — a reusable signature library, drag-and-pinch placement on any page, and a signed copy rendered into the PDF itself, all offline. Upload-based services work too, but think twice before sending a contract to someone's server.

Option 1: the built-in Markup tool

Open a PDF in the Files app, tap the pencil (Markup), then + → Add Signature. It's built in and fine for a quick one-off. The friction shows on real documents: placement is fiddly on multi-page files, and the signature is stored as an annotation layer — some PDF apps let the recipient select, move or delete it afterwards.

Option 2: sign on-device with a signature library (iFiles)

Open iFiles → Tools → Sign PDF and pick the document.
Draw your signature with a finger — black or blue ink — or tap one you saved before. Every signature you draw is kept in a private, on-device library.
Drag and pinch it into position — any page, several signatures if needed. Tap a placed signature to move or delete it.
Tap Sign & Save. The signature is rendered into the page itself, so it looks identical in every reader, and the signed copy lands in your files.

Nothing is uploaded at any step — drawing, placing and rendering all happen on the phone. For contracts and anything with personal data, that's the point.

Option 3: upload-based tools (Adobe, online sites)

Adobe's Fill & Sign and sites like Smallpdf or iLovePDF handle signing in the browser or a big app suite. They're capable — and they involve uploading your document to a server, an account for most features, and subscriptions aimed at business teams. For the everyday "sign this and send it back" case, an on-device signer is faster and keeps the document private.

Bonus: paper form? Scan it, then sign it

If the form arrived on paper, scan it first: iFiles' Document Scanner turns it into a clean PDF with the camera, and that PDF goes straight into Sign PDF. Paper in, signed PDF out — no printer at any step.

FAQ

Is a drawn signature legally valid?

For everyday documents — contracts, forms, approvals — a drawn electronic signature is widely accepted. Some cases (notarization, certain government filings) require certified e-signature services or wet ink; check what your counterparty needs.

Does my document get uploaded?

Not with on-device tools: in iFiles, drawing, placing and rendering all run offline on the iPhone. Upload-based services, by definition, receive a copy of your document.

Can the recipient move or remove my signature?

In iFiles the signature is rendered into the page itself rather than layered as an editable annotation — it behaves like part of the document in other readers.

Is signing free in iFiles?

Your first signed PDF is free to save. Unlimited signing is part of iFiles Pro (3-day free trial, then yearly, monthly or lifetime).

Do it in one app

iFiles is free to download — file browser, Wi-Fi transfer, PDF tools, metadata cleaner and more, all on your device.

Download on the App Store