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.

It's quick and easy to create a digital signature on your Mac and then add it to PDFs, images and documents with one click ...

Just like how you add inked signatures on a hard-paper document, you can also add an electronic signature to your PDF document in the Edge browser.

Thunderbird 142 release is here with message linking, PDF signatures, Fastmail calendar fixes, and some new-found respect for ...

In the event a digital document needs to be signed, like a form or a letter, macOS includes a way to add your signature without needing to print out the pages and rescan them. AppleInsider shows ...

Preview can store multiple signatures at once. Apple also provides markup tools in the Mail app in macOS to create electronic signatures that can be directly inserted into your emails.