iOS Document Signing
The native Preview app in macOS has long been a simple and powerful photo tool, but it’s getting a new trick in Catalina. While Preview already has several ways for users to sign documents on their Macs, macOS Catalina has added iOS signing support.
That means you can use your iPhone or iPad to quickly jot down your signature on a document. This feature is accessible in Preview’s Tools option in the menu bar. When you tap on Annotate > Signature > Manage Signatures, you should see a new option to use an iPhone or iPad. Tap on the device you want and you’ll see a signature pad pop up on it.