How to Sign a PDF on iPhone (Built-in Way and Faster Way)
Your iPhone can sign PDFs without any extra app, using the Markup tool built into Files and Mail. If you sign documents often, want your real handwritten signature, or need to scan paper forms, a dedicated signing app saves time.
Sign a PDF with the Files app
- Open the PDF in Files. Save the attachment to Files, then tap it to open.
- Tap Markup. Tap the pen icon at the top or bottom of the screen.
- Add a signature. Tap the plus button, choose Add Signature, and sign with your finger.
- Place and save. Drag and resize the signature onto the signature line, then tap Done.
Sign a PDF attachment in Mail
Open the attachment, tap Markup, add your signature the same way, and tap Done. Mail offers to reply with the signed document attached.
Use your real handwritten signature
A signature drawn with a finger rarely looks like the one you write on paper. ClearSign: PDF Scanner & Sign lets you sign on paper, scan it with your camera, and remove the background to create a clean transparent signature you can reuse on every document.
Scan, fill, and sign in one app
- Scan paper documents to PDF with automatic edge detection
- Fill forms with text, dates, initials, and stamps
- Highlight and annotate, with Apple Pencil support on iPad
- Import from Mail, Safari, and Files, and share the signed PDF
Frequently asked questions
Can I sign a PDF on iPhone without an app?
Yes. Use Markup in the Files app or Mail and choose Add Signature.
How do I remove the background from a scanned signature?
Scan your paper signature with ClearSign. The app removes the background and saves a transparent signature you can reuse.
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