CE Marking vs Declaration of Conformity: What’s the Difference?

People often use “CE mark,” “CE certificate,” and “Declaration of Conformity” as if they were interchangeable. They are not — and for many products, one of them does not even exist. Getting the distinction right matters, because the wrong assumption can leave you without the documentation an auditor or customer expects.

The CE mark: the visible symbol

The CE marking itself is just that — a mark affixed to the product (or its packaging or documentation). It is the visible, public-facing signal that the manufacturer declares the product conforms with the applicable EU legislation. On its own, the mark carries no detail; it points to the documentation behind it.

The Declaration of Conformity: the legal document

The EU Declaration of Conformity (DoC) is the legal document that stands behind the CE mark. In it, the manufacturer formally declares that the product meets the requirements of the directives and regulations that apply to it. A DoC typically identifies:

• The product and the manufacturer (or authorised representative).
• The EU legislation the product conforms to.
• The harmonised standards or specifications applied.
• Where relevant, the Notified Body involved and its certificate.
• The name and signature of the person authorised to sign on the manufacturer’s behalf.

For most products, the DoC — not a certificate — is the central document. If you are asked to “prove CE compliance,” this is usually what is being requested.

The “CE certificate”: only sometimes

Here is the part that trips people up: for many products there is no CE certificate at all. Where the legislation allows self-assessment, the manufacturer evaluates conformity, compiles a technical file, signs the Declaration of Conformity, and affixes the mark — with no third party issuing a certificate.

A certificate enters the picture only for higher-risk products, where the legislation requires an independent Notified Body to assess conformity. The Notified Body then issues a certificate (such as an EU-type examination certificate), and its four-digit identification number appears beside the CE marking. Even then, the Declaration of Conformity is still required — the certificate supports the declaration rather than replacing it.

Putting it together

Think of it as three layers: the CE mark is the symbol on the product, the Declaration of Conformity is the document the manufacturer signs to back it up, and a certificate exists only where a Notified Body is mandated. All three need to be consistent — and the documents need to be kept available for years.

Because Declarations of Conformity and any Notified Body certificates pile up across a product range — and across your suppliers’ components — they are worth storing against the [product record](/features/product-library) they belong to, and collecting from suppliers through [supplier collaboration](/features/supplier-collaboration) rather than chasing them by email. The [CE marking guide](/learn/ce-marking) sets out where each document fits in the wider process.