'E-signature' and 'digital signature' get used interchangeably. They are not the same thing. The distinction has legal consequences.
Here is the plain-language version.
Electronic signature (e-signature)
Broad term — any digital mark indicating consent. Drawn signature on a PDF, typed name, clicked 'I agree'. Legally binding under ESIGN, UETA and eIDAS for everyday contracts. Sign-pdf produces e-signatures.
Digital signature
Specific cryptographic technique. Uses a private key and certificate to mathematically tie the signer to the document. Tamper-evident. Stronger legal posture in regulated industries. Acrobat Pro and DocuSign Advanced/Qualified support this.
Qualified electronic signature (QES)
EU-specific category under eIDAS. Strongest legal posture — equivalent to handwritten signature in most contexts. Requires a Qualified Trust Service Provider.
Best for…
E-signature for everyday contracts globally. Digital signature for tamper-evident regulated workflows. QES for EU-regulated industries requiring the highest tier.
FAQ
Is an e-signature legally valid?
Yes, for everyday contracts in most jurisdictions.
When do I need a digital signature?
Regulated industries, high-value transactions, or counterparties who demand it.
Does Flint do digital signatures?
Flint produces electronic signatures with metadata. For PKI-based digital signatures, Acrobat Pro and dedicated tools are stronger.
Most everyday work needs an e-signature. Digital signatures sit above that for regulated cases.