Electronic Seal vs. Electronic Signature: The Difference

A procurement portal asks you to "upload your company's e-seal." Your colleague in IT says the company already has DocuSign. The finance team says they have a PNG of the company stamp. Your lawyer mentions a "qualified certificate." All four of them are talking about something different, and all four are using words that sound interchangeable.

They are not. "Electronic seal," "electronic signature," and "digital signature" overlap, but each has its own meaning, and in some legal systems one of them is a precisely defined term. Knowing which one a document actually needs avoids both under-doing it (sending a picture where proof was required) and over-doing it (buying a certificate for a quotation nobody will ever dispute).

This article is general information, not legal advice. Requirements depend on the country, the document, and the parties. Check with a qualified lawyer where it matters.

Four things that share one vocabulary

In everyday use, people mean one of four things:

1. A seal image. A picture of a stamp, such as a transparent PNG, placed on a document. This is what most "electronic seal" generators, including this one, produce. It is a visual mark, nothing more.
2. An electronic signature. A broad legal idea: electronic data attached to a document that shows a person's intention to sign. A typed name, a drawn squiggle, a checkbox, or a click-to-sign button can all be electronic signatures.
3. A digital signature. A specific technology: a signature created with public-key cryptography, usually backed by a certificate. It mathematically binds the document to the signer's key, and any later change to the document breaks it.
4. An electronic seal in the legal sense. In the EU and some other systems, this is the organization's counterpart to an electronic signature, issued to a legal entity rather than a person.

The confusion comes from mixing up the first and the fourth. They share a name and almost nothing else.

In EU law, "electronic seal" is a precise term

The EU's eIDAS Regulation defines an electronic seal as data in electronic form attached to or logically associated with other data to ensure the latter's origin and integrity. The key differences from an electronic signature:

• Who creates it. An electronic signature is created by a natural person. An electronic seal is created by a legal person, such as a company, a public body, or an association.
• What it says. A signature expresses a person's will to sign. A seal says "this document came from this organization and has not changed since." It is closer to a tamper-evident company stamp than to a signature.
• Levels. Both come in three levels: simple, advanced, and qualified. A qualified electronic seal relies on a qualified certificate from a supervised trust service provider and enjoys a legal presumption of the integrity of the data and the correctness of its origin. A qualified electronic signature has the equivalent legal effect of a handwritten signature.

Organizations use electronic seals for things like automatically issued invoices, certificates, statements, and official notices, where no single person signs each document but the recipient needs to know it really came from the issuer.

Notice what is missing from that definition: any requirement that the seal look like anything. A qualified electronic seal may have no visible image at all. Conversely, a picture of a stamp, however convincing, is not an electronic seal in the eIDAS sense.

Electronic signature: broad and mostly technology-neutral

Most legal systems recognize electronic signatures in general terms. In the United States, the ESIGN Act and state laws based on the Uniform Electronic Transactions Act say a signature or record cannot be denied legal effect solely because it is electronic. They do not prescribe a technology; what matters is the intent to sign and the ability to show who signed and what they signed.

That flexibility is why a typed name in an email or a click on a signing platform can be a valid signature for many everyday contracts. It is also why evidence matters so much. A signing platform that records the signer's email, login, IP address, time stamps, and a tamper-evident final PDF gives you something to rely on if the signature is ever questioned.

Digital signature: the machinery underneath

A digital signature is how strong electronic signatures and electronic seals are usually built. The signing software calculates a fingerprint (hash) of the document and encrypts it with the signer's private key. Anyone with the matching public key, typically embedded in a certificate, can verify two things: that the signature was made with that key, and that the document has not changed since.

In a PDF reader, this shows up in the signature panel. A properly signed PDF reports something like "Signed and all signatures are valid," names the certificate holder, and warns if the document was modified after signing. A PDF with only a seal image shows nothing in that panel, because there is nothing there to verify.

Where seal cultures fit in

Countries with a strong seal tradition have built electronic equivalents that map the old seal onto this machinery.

• China. The Electronic Signature Law provides that a reliable electronic signature has the same legal effect as a handwritten signature or a seal. Electronic company seals are issued and managed through certified platforms, tied to the company's identity. Electronic seals in China explains how.
• Japan. The Act on Electronic Signatures and Certification Business gives qualifying electronic signatures legal standing, and cloud signing services have replaced much physical stamping in business. Hanko and e-seals in Japan covers the details.
• Korea. A 2020 overhaul of the Digital Signature Act ended the special status of the old government-accredited certificates and opened the market to a range of signing methods. See dojang and e-seals in Korea.

In all three, the familiar red seal image often still appears on the finished document. But on a properly signed document it is the visible face of a cryptographic signature, not the thing that gives the document its force.

How to tell what you are looking at

When you receive a "sealed" PDF and need to know what it really is:

1. Open the signature panel in Acrobat Reader or another PDF reader that shows signatures. If it lists a valid signature with a named certificate holder, the document carries a digital signature.
2. Click the seal image. If it is a selectable image or annotation with no signature behind it, it is a picture.
3. Check for an audit trail. Signing platforms usually attach or link to a certificate of completion listing signers, emails, and times.
4. When in doubt, ask the sender how the document was signed.

Which one do you actually need?

• A quotation, invoice, or routine letter between parties who already deal by email: a seal image or a simple electronic signature is usually what is expected.
• A contract you may need to enforce: an electronic signature with a good audit trail, typically through a signing platform.
• A document required by law to be in written or signed form, or a filing with an authority: check the rule. It may require a qualified electronic signature, a registered seal, or a wet-ink original.
• Documents your organization issues in volume, such as certificates or statements: in the EU and similar systems, an advanced or qualified electronic seal is designed for exactly this.
• A portal that asks you to "upload your e-seal": read the instructions. Some want a seal image for display; others want a certificate file.

The are image seals legally valid? guide goes deeper into what a picture can and cannot do.

Where a seal image still belongs

None of this makes seal images useless. Many signing platforms let an organization upload its seal image as the visible appearance of a signature or seal, so the finished document looks familiar to readers who expect a red seal while the cryptography underneath does the legal work. A clean, transparent, correctly sized image is exactly what those platforms ask for.

That is where the seal generator fits: it creates seal graphics for design, document mockups, routine correspondence, and as the visible image inside a proper signing process. It does not verify identity and it does not create digital signatures. Use it for the look, and use a compliant signing service when a document needs legal force.