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Sign PDFs on iPhone, and what an electronic signature is and is not.

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A hand signs with a stylus on an iPhone lying on a light desk next to blank sheets of paper and an envelope

SignaturesAug 24, 2026· 9 min read

How to sign a PDF on iPhone and send it back in minutes

A lease, a permission slip or a contract arrives by email and needs your signature today. Here is how to sign it on your iPhone, with Markup or a PDF app, and send it back without a printer.