Electronic Signature vs Digital Signature: Singapore Guide

An electronic signature is any electronic way of showing you agree to a document: a typed name, a pasted image of your handwriting, a click on "I accept". A digital signature is a specific, cryptographic kind of electronic signature that proves who signed and shows whether the file changed afterward. Every digital signature is electronic. Not every electronic signature is digital.

In Singapore the difference has legal weight, so this guide ties each term to the Electronic Transactions Act and gives you a way to choose for your next PDF.

TL;DR

• Electronic signature is the broad category. It covers typing a name, pasting a signature image or clicking a button.
• Digital signature is a technical method using public key cryptography. It checks the signer's identity and detects any change to the file.
• Singapore law is generally open to both, but only a secure electronic signature gets legal presumptions in a dispute.
• Some documents are carved out of the Act entirely, including wills, powers of attorney and property sale or tenancy contracts.
• Practical rule: use a simple electronic signature for low-risk paperwork. Use a digital signature, such as Sign with Singpass, when you may need to prove the signature later.

Table of Contents

• The short answer: a category and a technology
• Side by side: electronic vs digital signature
• How a digital signature actually works
• What Singapore law says
• Is an electronic signature legal in Singapore?
• The Singapore options in practice
• How to choose: a practical decision guide
• Common mistakes to avoid
• Our perspective at FlowPDF
• Sign a PDF locally with FlowPDF
• FAQ
• Sources

The short answer: a category and a technology

Think of it this way. "Electronic signature" describes what you intend to do: sign. "Digital signature" describes how the signing is secured.

The Singapore Government's own explanation says a digital signature is a type of electronic signature created with asymmetric, or public key, cryptography. Unlike a drawn signature, it is not directly visible on the record. It sits in the file as data that software can check.

TechTarget makes the same point: all digital signatures are electronic, but not all electronic signatures are digital.

The confusion comes from vendors using the two words as if they meant the same thing. They do not, and the gap matters when someone later says "I never signed that".

Side by side: electronic vs digital signature

How a digital signature actually works

You do not need to understand the mathematics, but the idea is simple.

1. The software creates a short fingerprint (a hash) of your document.
2. It locks that fingerprint with your private key, which only you control.
3. Anyone can check the result with your matching public key and certificate.
4. If even one character in the PDF changes, the fingerprint no longer matches and the signature shows as invalid.

Netrust describes this as a mathematical technique, using an asymmetric cryptosystem and hash function, that can be validated to prove authenticity and integrity.

A pasted image of your handwriting has none of this. Anyone who gets the image can paste it onto anything, and the PDF carries no record of whether it was edited afterward.

What Singapore law says

The governing law is the Electronic Transactions Act 2010 (ETA). It does not prescribe one form of e-signature. Section 8 says that where a rule of law requires a signature, an electronic method can satisfy it if certain conditions are met. A Lexology summary of the Act notes that it sets pre-requisites before an e-signature has legal effect.

In practice the Act sorts signatures into two tiers.

Ordinary electronic signatures (OES)

This is the everyday tier: a typed name, a pasted image, a tick box. It can be valid. The catch is proof. If the other side disputes it, the person relying on the signature has to show that it was really applied by the signer and that the document was not changed.

Secure electronic signatures (SES)

The ETA defines a secure electronic signature as one treated as secure under section 18 or another provision of the Act. Broadly, the signature must be unique to the signer, under the signer's sole control, and linked to the record so that any change is detectable.

The benefit sits in section 19. Under the Act's presumptions, a secure signature is presumed to be the signer's, applied with intent to sign. Singapore's Sign with Singpass documentation says the same: the legal presumption covers signer, intent and an unaltered document. The burden then shifts to the party who disputes the signature.

Digital signatures built on public key infrastructure are the usual route to SES status, though the label is decided by the Act and not by the product name.

Is an electronic signature legal in Singapore?

Generally yes, for ordinary commercial paperwork such as service agreements, NDAs, quotations, consent forms and internal approvals. The law does not require a special tool.

Two cautions apply.

Some documents are excluded. The First Schedule of the ETA lists matters the Act does not cover, including wills, powers of attorney and contracts for the sale or other disposition of immovable property. Tenancy agreements are among the items our research flagged under that property category. You can read the list in the Act itself. For these documents, talk to a Singapore-qualified lawyer before choosing any electronic method.

Legal does not mean easy to prove. A leasing-focused article from Dedoco explains the burden: the party relying on an e-signed document must show the signature was added by the right person. That is the OES problem in one line.

The Singapore options in practice

Sign with Singpass

If you are a Singpass user, this is the most accessible digital signature. The government's Sign with Singpass overview describes it as a digital signing solution built on the Singpass ecosystem for signing contracts and agreements remotely through the Singpass app. Signatures made this way are treated as secure electronic signatures.

The government's flow is short: choose Sign with Singpass on the service, review the document, scan the QR code, then approve in your Singpass app.

Note that this route runs through a service that integrates Sign with Singpass. It is not something you do by dropping an image on a PDF.

Certificates from an accredited authority

Organizations that need certificates under their own control can use an accredited certification authority. Netrust states it has been Singapore's IMDA-accredited CA since June 2001. Netrust also runs workshops on the differences between electronic and digital signatures, which shows how often the two get mixed up.

Simple e-signature tools

Most freelancers, students and small teams sign with a drawn or imported signature image. It is fast and cheap, and it is fine when nobody is likely to dispute the document.

How to choose: a practical decision guide

Ask three questions before you sign.

1. What happens if this is disputed? A signed meeting acknowledgement is low stakes. A high-value supply contract is not.
2. Who is the other party? Banks, regulators and larger firms may require a specific method. Check their instructions first.
3. Is the document excluded from the ETA? If it is a will, a power of attorney or a property sale or tenancy contract, get legal advice first.

A scanned signature image is the most common pitfall. It is an ordinary electronic signature with no technical proof of integrity, and people often treat it as stronger than it is.

Common mistakes to avoid

• Assuming all e-signatures carry the same weight. They can all be valid, but they are not equally easy to prove.
• Pasting a signature image on a PDF and then sending an editable copy. Send a flattened or protected copy, and keep the original.
• Trusting a vendor's wording. If a product says "digital signature", check whether it uses a certificate or just draws your name on the page.
• Skipping a record. Keep the final PDF, the email thread and any audit trail together.

Our perspective at FlowPDF

We build a free PDF toolkit that runs in your browser. Your files are processed locally, with no upload, no account and no watermark. That shapes how we think about signing.

Most people who come to us have a simple need: put their signature on a contract, a form or an approval and send it back. For that job, a locally placed signature is a sensible, private choice. You do not hand a sensitive document to a server to do it.

We also want to be straight about the limit. Placing a signature on a PDF in your browser creates an ordinary electronic signature. It is not a certificate-backed digital signature, and we do not present it as one. If you need the legal presumptions of a secure electronic signature, use Sign with Singpass or an accredited certificate for that step.

A good workflow often uses both. Prepare the document privately first: merge the pages, remove the ones you do not need, redact sensitive details and then sign. Match the signature method to the risk, not to what is convenient.

— Ronald Ang

Sign a PDF locally with FlowPDF

For everyday paperwork, you can sign a PDF in your browser without uploading it anywhere. There is no signup and no cost, and the signed file stays on your device. Our guide on signing PDFs locally in Singapore covers OES and SES in more detail. If you only have a signature image, see how to sign a PDF with an image. The rest of the toolkit is listed on our free PDF tools page.

FAQ

Is DocuSign an electronic or digital signature?

DocuSign describes itself as an e-signature platform, and it also offers digital-signature options in some plans. The label depends on the setup you choose, not the brand. Check whether your signing flow uses a certificate that you can validate. DocuSign's own explainer covers how it frames the two terms.

Is a typed name or pasted image a valid signature in Singapore?

It can be, because the ETA does not demand one specific form. The risk is proof. If the signature is challenged, you carry the burden of showing it was applied by the signer and that the document was not altered. For higher-value agreements, use a secure method instead.

Can I use an electronic signature on a tenancy agreement or a will?

Check with a lawyer first. The ETA's First Schedule excludes wills, powers of attorney and contracts for the sale or disposition of immovable property. Our research also lists tenancy agreements there. Other laws may still apply, so get legal advice before you rely on any electronic method.

Is Sign with Singpass free?

The government documentation presents it as a signing solution built into the Singpass app, and our research describes it as zero-cost for individuals. The service where you sign, such as a law firm or a business, may have its own terms. Check with that service.

Does it matter if I sign by hand or electronically?

For most ordinary contracts in Singapore, electronic signing is accepted. What changes is how easy it is to prove later. A secure digital signature gives you the strongest footing. A simple electronic one is fine for low-risk documents.

Sources

• Electronic Transactions Act 2010, Singapore Statutes Online
• How our digital signatures work, Sign with Singpass
• Overview of Sign, Sign with Singpass
• Sign with Singpass: How It Works, Singapore Government Developer Portal
• About Us, Netrust
• Digital signing, Netrust
• Electronic vs. digital signatures, TechTarget
• The Use of E-signatures in Documents, Lexology
• Electronic signing of lease and tenancy agreements, Dedoco
• Digital vs electronic signature, DocuSign

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