Electronic Signature vs Digital Signature: What's the Difference?
Updated June 18, 2026 · PDF Image Signer
People say "electronic signature" and "digital signature" as if they were the same thing. In casual use they often are. But in law and in technology they describe two different ideas, and confusing them can lead to a rejected filing or a contract that does not hold up the way you expected. This guide explains what each term actually means, how a digital signature works under the hood, and when you genuinely need one over the other.
What an electronic signature is
An electronic signature (or e-signature) is a broad, legal and user-experience term. It refers to any electronic mark or action a person makes to show they intend to agree to or approve a document. That definition is intentionally wide. An electronic signature can be:
- Your name typed into a field at the bottom of an agreement.
- An image of your handwritten signature pasted onto a PDF.
- A drawn squiggle made with your finger or a stylus.
- Clicking an "I agree" or "Accept" button.
- Tapping a button in an eSign workflow that records your assent.
What unites these is intent, not technology. The mark says "this person meant to sign." It does not, on its own, prove who made the mark or guarantee that nobody altered the document afterward. That is fine for the vast majority of everyday agreements, where trust between the parties and a clear audit trail are enough.
What a digital signature is
A digital signature is something much more specific: a cryptographic technique. It is one possible way to implement an electronic signature, but it adds strong mathematical guarantees about who signed and that the content has not changed. Every digital signature is an electronic signature, but the reverse is not true.
Digital signatures rely on public-key cryptography. Each signer holds a matched pair of keys: a private key, kept secret, and a public key, which can be shared freely. The two are mathematically linked so that something processed with the private key can be verified with the public key, but the private key cannot be derived from the public one.
How it works, conceptually
When you digitally sign a document, the software does roughly this:
- Hashing: A hash function condenses the entire document into a short, fixed-length value, like a fingerprint. Change a single character and the hash changes completely.
- Signing: Your software encrypts that hash with your private key. The result is the digital signature, which is attached to the document.
- Verifying: Anyone with your public key can decrypt the signature back into the original hash. The verifier independently re-hashes the document they received and compares the two hashes.
If the two hashes match, two things are proven at once. Integrity: the document was not altered after signing, because any change would produce a different hash. Authenticity: the signature really came from the holder of the matching private key, because only that key could have produced a signature your public key can verify. This combination is what an image of a signature simply cannot offer.
The certificate: tying a key to a real person
There is one gap left. A public key on its own only proves "the holder of this private key signed it." It does not say who that holder is. That is the job of a Digital Signature Certificate (DSC), issued by a trusted Certifying Authority (sometimes called a Certificate Authority, or CA).
The CA verifies the applicant's identity and then issues a certificate that binds the person's real-world identity to their public key. The certificate itself is signed by the CA. So when you verify a digital signature, you are also trusting a chain: this key belongs to this person, vouched for by a recognized authority. That chain of trust is exactly what makes digital signatures acceptable for high-stakes, legally regulated submissions.
Why an image signature is not a digital signature
Pasting a picture of your handwritten signature onto a PDF is a perfectly valid electronic signature. It expresses intent and is widely accepted for ordinary documents. But it is not a digital signature. An image carries no private key, no hash of the document, and no certificate. Anyone can copy the image, and nothing in it detects whether the underlying document was edited afterward. It conveys intent, not cryptographic proof.
When to use each
| Situation | Usually appropriate |
|---|---|
| Everyday agreements, internal approvals, NDAs, letters, consent forms | Electronic signature (typed name or image) |
| Routine business contracts where parties trust each other | Electronic signature, ideally with an audit trail |
| Government tenders, regulatory and tax filings, company registrations | Digital signature with a DSC |
| Court or official government submissions that mandate it | Digital signature with a DSC |
The practical rule: use an electronic signature for ordinary documents where proving intent is enough, and use a digital signature with a DSC whenever a regulator, portal, or court specifically requires one. Many official systems will reject anything that is not a properly certified digital signature, so check the requirement before you submit.
Note: Laws vary by country. For your jurisdiction, see our overview for India and consult a professional.
Stamp an image signature
This tool creates the electronic (image) kind of signature, which is the right choice for the everyday documents most people sign. You can drop a photo or scan of your signature onto any page in seconds. Open the PDF signer to get started, or read our walkthrough on how to add a signature image to a PDF. If you need a certified digital signature for a regulated filing, you will instead need a DSC from a recognized Certifying Authority.