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Direct answers to real iPhone PDF questions, with the screen you need at every step.

PDF Sign & Scan showing a handwritten signature being placed and resized on a PDF

01How to sign a PDF on iPhoneOpen a PDF, add your real handwritten signature, resize it, and share the signed copy from your iPhone.

PDF Sign & Scan capturing a real handwritten signature and removing the paper background

02How to add a handwritten signature to a PDFUse a signature you wrote on paper—not a script font or a rushed finger drawing—and place it cleanly on a PDF.

The Scan Your Signature screen in PDF Sign & Scan with a cleaned signature preview

03How to scan a signature from paperPhotograph your signature on paper, remove the background on your iPhone, and save clean ink for PDFs.

The PDF Sign & Scan signature library where a saved signature can be exported as PNG

04How to make a transparent signature PNGRemove the white paper behind a photographed signature and export the clean handwriting as a transparent PNG.

PDF Sign & Scan opening a document from PDF, image, or scanned paper sources

05How to sign a PDF without printing itSkip the print-sign-scan loop. Add your saved handwritten signature directly to a PDF and share the signed copy.

A signed PDF being shared after completion in PDF Sign & Scan

06How to sign a PDF from Mail or Files on iPhoneMove an email attachment or saved PDF into PDF Sign & Scan, add a signature, and return the signed copy.

A visible handwritten electronic signature placed on a PDF in PDF Sign & Scan

07Electronic signature vs. digital signatureUnderstand the practical difference between a visible electronic signature and a certificate-based digital signature before signing a PDF.

The Saved Signatures picker in PDF Sign & Scan

08How to save and reuse a signature on iPhoneCreate a named signature once, keep it in your on-device library, and place it on future PDFs without drawing it again.

PDF Sign & Scan importing a PDF attachment before adding a signature

09How to sign a PDF from Gmail on iPhoneOpen a PDF attachment from Gmail, add your handwritten signature, and send the signed copy back from your iPhone.

PDF Sign & Scan removing the paper background from a handwritten signature image

10How to add a signature image to a PDF on iPhoneTurn a signature photo into clean transparent ink, place it over a PDF, and avoid the white rectangle behind it.

A photographed signature cleaned and saved in the PDF Sign & Scan signature library

11How to save a signature from a photo on iPhoneUse a photo you already took, remove the paper background, and keep the cleaned signature in an on-device library.

A reusable handwritten signature being positioned on a PDF in PDF Sign & Scan

12Apple Markup vs. a PDF signature app on iPhoneUse the free built-in tool for a quick finger-drawn signature. Use a dedicated app when you need handwriting from paper and a reusable library.