Don't have a printer and scanner? You still can easily sign a PDF file, no matter the operating system you're running.

If you want to sign a PDF, this post talks of free tools that let you add a signature to PDF. Type or draw a signature using them.

This how-to guide will show you how to create an electronic signature and use it to sign a PDF file in Windows, MacOS, Android or iOS.

How to Sign PDFs on Mac On your Mac, you use the built-in Preview app so you can sign the PDFs. Just locate the PDF file that you want to sign using the Finder feature, according to MacRumors.

Signing documents with your iPhone How to sign PDF documents on your iPhone For iPhone users, one of the easiest ways to sign a PDF document is to use the tools built into the Mail app.

Learn how to sign a PDF in Google Drive using the Drawings tool in Google Docs and third-party add-ons such as DocHub and Adobe Acrobat.