Wet Signature vs Digital Signature: What’s the Difference?
What is a wet signature?
A wet signature is a handwritten mark made with ink on a physical document to show approval or intent. Its authenticity is typically supported by the original paper, witnesses, notarization, or handwriting evidence, depending on the transaction.
When should you use a wet signature?
Documents that expressly require handwritten form
Transactions where a regulator or counterparty requires an original
Certain wills, deeds, family-law documents, or notarized records, depending on jurisdiction
Situations where digital signing is not accepted or available
What is a digital signature?
A digital signature uses public-key cryptography to create a verifiable link between a signer’s private key and a document. A corresponding public key, often supplied in a digital certificate, lets recipients verify the document’s origin and detect changes made after signing. Identity assurance depends on how the signer and certificate were verified.
When should you use a digital signature?
Remote or multi-party business agreements
Documents that need tamper detection and verifiable origin
Regulated workflows that specify an accepted digital-signature level
High-volume processes where speed, traceability, and audit evidence matter
Wet signature vs digital signature: key differences
Both methods can be legally effective, but “valid” and “equivalent to a handwritten signature” are not universal claims. The result depends on the jurisdiction, document type, signer-consent process, and signature level. In the EU and Switzerland, qualified electronic signatures receive specific handwritten-signature equivalence.
Choose a wet signature when
Use a wet signature when a law, regulator, or counterparty specifically requires an original handwritten signature, or when the process must remain paper-based. Requirements vary by document and jurisdiction.
Choose a digital signature when
Choose a digital signature when remote signing, tamper detection, certificate-based verification, and an auditable workflow matter. An electronic signature may be sufficient when the process needs to capture intent but does not require a cryptographic digital signature.
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