Digital Signature vs. Electronic Signature: What's the Actual Difference

"Digital signature" and "electronic signature" get used as if they're the same thing, but they describe two different mechanisms with different guarantees. Most day-to-day PDF signing — including the kind people do to sign contracts, agreements, and forms — uses the electronic signature, and it's worth understanding what that does and doesn't provide.

Electronic signature: proving intent

An electronic signature is a broad legal category: any electronic mark or action indicating a person's intent to sign — a typed name, a drawn signature, a checkbox click. Its legal weight comes from laws like the U.S. ESIGN Act or the EU's eIDAS regulation, which recognize this kind of consent as binding in most contract and agreement contexts. It's not a cryptographic mechanism; the enforceability comes from the surrounding legal framework, not from the signature itself being unforgeable.

Digital signature: proving integrity and identity

A digital signature is a specific cryptographic technique: it uses a certificate and a public/private key pair to sign the document in a way that (a) ties the signature to a verified identity issued by a certificate authority, and (b) makes any change to the document after signing detectable, since altering the file invalidates the cryptographic signature. This is a stronger, more formal guarantee than an electronic signature provides, but it requires a digital certificate to begin with.

Which one do you actually need?

For most everyday use — signing a freelance contract, an NDA, a lease, an internal approval form — an electronic signature is legally sufficient and is what our Sign PDF tool applies. Reach for a certificate-based digital signature only when a specific requirement calls for it: certain government filings, some regulated industries, or a counterparty that specifically requires certificate-based signing, which typically means acquiring a digital ID and signing through certificate-aware software like Acrobat.