Digital Signature PDF: Sign Documents That Hold Up Legally
Digital signatures and e-signatures are not the same. Learn how PDF digital signatures use PKI certificates, and which standards are legally recognized.
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Tags: pdf, developer-tools, security
Digital Signatures in PDF: How They Work and How to Add Them A scanned signature on a PDF proves nothing about the document's integrity. Someone can scan their signature onto one document and paste that image into any PDF they choose. A digital signature — the cryptographic kind — is fundamentally different. It mathematically binds the signer's identity to the exact bytes of the document at the moment of signing, and any change to the document after signing breaks the signature. Certificate-Based Signatures vs Electronic Signatures The terms are often conflated but mean different things: Electronic signature: Any digital indication of agreement — a typed name, a checkmark, a drawn signature image, clicking "I agree." Legal in most jurisdictions for commercial agreements but provides no…
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