How to store signature without trackpad or camera
How can I store my signature to use with Preview if I don't have a camera attached to my Mac Mini, and I don't have a trackpad? I do have an iPhone, iPad and a good JPG of my signature.
My apologies, I misread your post saying “I don’t have”.
You can use Continuity Markup to use your iPhone or iPad to draw your signature.
Use iPad, iPhone, or iPod touch to sketch in or mark up Mac documents - Apple Support