Free self-sign vs. free send-for-signature
Sites like Smallpdf or iLovePDF offer free tools to add your own signature to a PDF you already have. That's useful for one-sided forms, but it doesn't create the audit trail courts expect when two parties sign a contract. GetItSigned handles the send-for-signature workflow: you upload, place fields, email a private link, and both sides get a tamper-evident signed PDF when the last signer finishes.