Electronic signature vs digital signature: the real difference (2026)
TL;DR: An electronic signature is any electronic mark that shows you intended to sign something — a typed name, a drawn squiggle, a click of "I agree". A digital signature is a specific piece of cryptographic technology (based on PKI) that can be used to secure an electronic signature and prove a document hasn't been altered. So they aren't rivals: an electronic signature is the legal act of signing, and a digital signature is one of the methods used to protect and verify it. Nearly every agreement you sign online is legally binding as a simple electronic signature — you only need the heavy cryptography of a digital signature (or a formally regulated one) in a small number of higher-stakes cases.
The two phrases get swapped around constantly, including by vendors who should know better. Once you see the distinction it stays clear, so let's set it out properly.
What is an electronic signature?
An electronic signature is a broad, legal idea. It covers any electronic data attached to, or logically associated with, an agreement that a person adopts with the intention of signing. The defining ingredients are intent and association — you meant to sign, and the mark is tied to the document.
In practice that includes:
- Typing your name into a signature field
- Drawing your signature with a mouse, trackpad or finger
- Clicking an "I agree" or "Accept" button
- Pasting an image of your handwritten signature
- Replying to an email to confirm acceptance
The term describes what you did (expressed intent to be bound), not the technology underneath. That's why it's so wide — and why the vast majority of everyday contracts, from a freelance agreement to a tenancy renewal, are validly signed this way.
What is a digital signature?
A digital signature is not a legal category at all — it's a technical mechanism. It uses public-key cryptography (PKI) to bind a signer's identity to a document and to detect any change made after signing.
When a document is digitally signed, software creates a unique cryptographic "hash" of the content and encrypts it with the signer's private key. Anyone can then use the corresponding public key to check two things: that the signature really came from that key, and that not a single byte of the document has changed since. Alter so much as a full stop and the signature breaks. That's the real value of a digital signature — tamper-evidence and verifiable integrity, not a prettier squiggle.
Crucially, a digital signature is often the technology that sits underneath a strong electronic signature. The two live at different layers: one is the legal act, the other is the maths that secures it.
Electronic signature vs digital signature: side-by-side
Electronic signatureDigital signature
What it is
A legal concept: any electronic mark made with intent to sign
A technology: cryptography (PKI) that secures and verifies a signature
How it works
Captures intent — a click, typed name, drawn mark or accepted email
Uses public/private keys and hashing to bind identity and detect tampering
Legal standing
Legally binding in its own right under ESIGN, UETA and eIDAS
Not a legal category; used to reach higher assurance tiers (AES/QES)
Everyday use
Almost every online agreement — contracts, consents, NDAs, sign-offs
High-assurance or regulated documents; certificate-based signing
Example
Clicking "I agree" or typing your name to accept a proposal
A certificate-based, cryptographically sealed PDF that breaks if edited
When you need it
The default for the overwhelming majority of business agreements
When law or counterparty demands verified identity and provable integrity
Are electronic signatures legally binding?
Yes. In the UK, the EU and the US, an electronic signature is generally as enforceable as ink on paper, provided the signer intended to sign and the usual rules of contract are met. Two frameworks matter most.
United States — ESIGN and UETA. The federal ESIGN Act (2000) and the state-level Uniform Electronic Transactions Act establish that a signature, contract or record can't be denied legal effect purely because it's electronic. No cryptography is required.
EU and UK — eIDAS. The eIDAS Regulation defines three tiers of electronic signature, and this is where digital-signature technology comes back in:
- SES (Simple Electronic Signature) — the basic form: a typed name, a click, a drawn mark. Admissible and binding for most everyday agreements.
- AES (Advanced Electronic Signature) — uniquely linked to the signer, capable of identifying them, and able to detect later changes. This assurance is typically delivered using digital-signature (PKI) technology.
- QES (Qualified Electronic Signature) — an AES created with a qualified device and backed by a qualified certificate from a trust service provider. In the EU it is the only tier with the same legal effect as a handwritten signature by default.
After Brexit, the UK retained eIDAS as "UK eIDAS", so the same SES/AES/QES structure applies, overseen domestically rather than by the EU. For a fuller walkthrough see our guide to eIDAS explained, and our overview of whether electronic signatures are legally binding.
The tier you need is driven by risk and regulation — not by how the signature looks. A signed click can be every bit as enforceable as a cryptographic seal.
When do you actually need a digital signature (or QES)?
For the overwhelming majority of business — proposals, statements of work, NDAs, service agreements, consent forms, employment offers — a simple electronic signature is enough and holds up fine. You rarely need to reach for a formally qualified signature.
You should consider AES or QES when:
- A law or regulator explicitly requires a qualified signature (some notarial acts, certain property, and specific regulated financial or public-sector documents in parts of the EU)
- The counterparty or your own compliance policy mandates verified signer identity
- The value or dispute risk is high enough that you want the strongest possible proof of who signed and that nothing changed afterwards
Even then, the smart move is usually a simple electronic signature backed by strong evidence: verified identity where needed, plus a cryptographic, tamper-evident record. That gives you the ease of a one-tap signature and the integrity guarantees people associate with digital signatures — without forcing every signer through a certificate authority.
Where Signet fits
Signet is built around exactly that balance. Clients sign in one tap with no account to create, so the experience stays simple. Behind the scenes, every agreement is protected with a tamper-evident audit trail, a certificate of completion, and a publicly verifiable seal — so integrity is provable, not just claimed. It's aligned with eIDAS, ESIGN and UETA, with UK and EU data residency. Anyone can confirm a document's authenticity on our verify page, and you can read how the cryptography works on our security page.
In short: an electronic signature is the legally binding act of agreeing; a digital signature is the cryptography that can make that agreement provable. You almost always need the first. Signet gives you the assurance of the second without the friction.
This is general information, not legal advice.
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