GhostPDF
Sign PDF on Mac
Use GhostPDF to add certificate-based PDF signatures with .p12 or .pfx files, choose visible signature placement, and verify document integrity in Acrobat Reader.
Certificate signing
Use .p12 and .pfx certificate files to seal PDFs and help recipients verify integrity.
Visible signatures
Place typed text, an image, or handwriting on a page when you need a visible signature block.
Local workflow
Sign documents on your Mac without uploading sensitive PDFs to a web service.