“E-signature” and “digital signature” are often used as if they meant the same thing. They don’t, and the difference matters when someone asks you to “sign this PDF”.
Electronic signature
An electronic signature is any electronic mark that shows you agree to a document: a typed name, a ticked box, or a handwritten signature drawn with a mouse or finger and placed on the page. In many countries electronic signatures are legally valid for everyday agreements such as rental forms, permission slips, quotes and HR paperwork.
What it proves depends on the context: the e-mail it came from, the record of who sent the file, and any witnesses. The image itself can be copied, so it is evidence of intent rather than proof of identity.
Digital signature
A digital signature is a specific technical kind of electronic signature. It uses a certificate issued to you (often by a trusted provider or a government ID scheme) and cryptography to seal the document. PDF readers can then check two things: who signed, and whether the file has changed since. If anyone edits the document afterwards, the signature shows as invalid.
Digital signatures are typically required for high-value or regulated documents: some government filings, notarised documents, tenders and certain financial agreements.
Quick comparison
| Electronic (drawn) signature | Digital (certificate) signature | |
|---|---|---|
| What it is | An image or mark showing agreement | A cryptographic seal tied to a certificate |
| Proves identity | Not by itself | Yes, through the certificate |
| Detects later changes | No | Yes |
| Typical use | Everyday forms and agreements | Regulated, legal or high-value documents |
Which one do you need?
If the sender just wants the form back “signed”, a drawn electronic signature is usually what they mean. If they mention a certificate, a qualified signature or a specific signing service, you need a digital signature from that provider. When in doubt, ask the person who sent the document.
SmartPDF adds drawn electronic signatures: see how to sign a PDF. It does not create certificate-based digital signatures, and editing a PDF that already carries one will invalidate it.
This article is general information, not legal advice. Rules differ between countries and document types.