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How to sign a PDF on iPhone

iOS has no built-in way to do most PDF editing — the Files app can preview and rename PDFs, and Books can read them, but combining, splitting or editing pages means either paying for an app or handing your document to a website that uploads it. A browser tool avoids both: nothing to install from the App Store, and nothing uploaded off your phone.

Signing is the classic mobile job — a contract arrives by email and you need it signed and returned without finding a printer, a scanner and a pen.

Open Sign PDF →

Step by step on iPhone

  1. 1Open the Sign PDF tool and upload your document.
  2. 2Draw or type your signature in the side panel.
  3. 3Click on the page to place it, drag to position, then download the signed PDF.

When you tap to add a file, iOS opens a picker with Photo Library, Take Photo or Video, and Choose File. Pick Choose File to reach PDFs stored in Files, iCloud Drive, Google Drive or Dropbox if you have those apps installed.

Where the finished file is saved on iPhone

Safari saves downloads to the Downloads folder inside the Files app (On My iPhone → Downloads by default). Tap the download arrow in Safari's address bar to jump straight to the finished file, then use the share sheet to move it to iCloud Drive, Mail or any other app.

What iPhone can’t do on its own

iOS can show you a PDF and let you scribble on it with Markup, but it can't merge two documents, pull out a page range, or edit existing text. Those are exactly the gaps a browser tool fills without an install.

FAQ

Do I need to install an app to do this on iPhone?
No. Everything runs in Safari or Chrome on your phone — there's nothing to download from the App Store, no account, and no subscription.
Where does the finished PDF go on my iPhone?
Into the Files app, under Downloads. Tap the download icon in Safari's address bar to open it immediately, then share it to Mail, Drive or anywhere else from there.
Is a drawn signature legally valid?
In many places a simple electronic signature is accepted for everyday agreements. For legally-certified digital signatures with a certificate, use a dedicated e-signature service.
Can I place my signature on any page?
Yes — click anywhere on any page to drop your signature, then drag and resize it, and add it in as many spots as you need.
Is pdfcdf free to use?
Yes. Every tool on pdfcdf is completely free, with no account, no watermarks, and no limits on how many files you process.
Are my files safe? Do they get uploaded?
Your files never leave your device. Every tool runs entirely in your browser, so your documents are processed locally and are never uploaded to a server or seen by anyone.
Do I need to create an account or sign up?
No. pdfcdf works instantly with no sign-up, no email, and no software to install — just open the tool and go.
Does it work on mobile phones and tablets?
Yes. pdfcdf runs in any modern browser on phones, tablets, Mac, Windows and Linux — nothing to download.

Ready to sign a PDF on your iPhone?

Open Sign PDF →

Same tool, other devices

Sign a PDF on AndroidSign a PDF on MacSign a PDF on WindowsSign a PDF on ChromebookSign a PDF on iPad

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