Certificate of conformity (COC): what it is, who issues it, how to check one

The term covers three different documents, and most of the confusion comes from mixing them up. A purchase order may ask the supplier for a certificate of conformance with each delivery. A distributor or regulator may want a certification body’s certificate for the product. And a freight forwarder, customs broker or bank that writes one line — “we will need the COC” — means, for a US entry of a CPSC-regulated product, the importer’s own CPSC certificate, and for a market that runs an import programme, a certificate that a body appointed under that programme issues for one shipment. The requirement appears in a number of destination-country conformity programmes, including programmes in North, East and West Africa and the Gulf; the exact route and issuing party depend on the importing market.

What is a certificate of conformity?

A certificate of conformity is an attestation: a party with standing puts in writing that identified goods meet identified requirements. What it is worth depends on who signs it and on what evidence. Three kinds are in everyday use:

• The manufacturer’s or importer’s own certificate — the company that made or imported the goods states that they conform. Purchase orders often ask for one with every delivery, usually called a certificate of conformance or C of C, and US federal contracts have standard wording, signed by the contractor (FAR 52.246-15). For consumer products regulated by the US Consumer Product Safety Commission (CPSC), the importer or domestic manufacturer issues a General Certificate of Conformity, or, for children’s products, a Children’s Product Certificate based on testing by a CPSC-accepted laboratory. Its value is the signatory’s accountability, not an independent check.
• A certification body’s certificate — an independent body that has tested or assessed the product certifies that it meets a standard or regulation. An EU notified body’s certificate, where the product’s conformity route requires one, is of this kind.
• An import-programme certificate — some importing countries require a certificate from a body they appoint before the goods leave the country of export. Kenya’s Pre-Export Verification of Conformity (PVoC) requires a COC from a PVoC agent for regulated products; Nigeria’s SONCAP and Saudi Arabia’s SABER platform each pair a product certificate with a certificate used to clear the shipment.

The same four questions settle what any of them is worth: who issued it, against which requirements, on what evidence, and for which goods.

What your forwarder is actually asking for

When the request comes from a forwarder or broker for a market that runs an import programme, it is the programme certificate, and that is not a document the factory writes. Some countries operate a conformity-assessment programme for imported goods: before a shipment can be cleared, a body that the programme appoints or approves has to examine evidence about those specific goods and issue a certificate confirming they meet the standards the destination applies to that product category. The destination programme sets the certificate and supporting-document requirements, yet the request usually reaches you as a single acronym with no explanation attached.

Two things follow, and they are the two most first-time buyers get wrong. The certificate answers the destination’s requirements, not the supplier’s own quality claims — a factory’s ISO certificate, its in-house test report or its own declaration of conformity are inputs to an application, not substitutes for one. And under most programmes the certificate attaches to a shipment rather than to a product line in general: named importer, named goods, stated quantities. Some programmes also run registration or licensing routes for repeat products; which route applies is a question for the programme in force at your destination, not a general rule. It helps to be clear about what a COC is not:

• Not a certificate of origin — origin documents say where goods were made, for tariff and trade-agreement purposes. Conformity documents say the goods meet the destination’s product requirements. A shipment can need both.
• Not the supplier’s declaration of conformity — a declaration is the manufacturer asserting compliance on its own authority. A programme certificate is a third party asserting it on examined evidence. See the glossary for the distinction.
• Not an ISO certificate — a management-system certificate describes how a factory runs, not whether one consignment conforms.
• Not an inspection report — the report is evidence submitted with an application. The certificate is what the body issues after accepting it.

Why the certificate is often the reason the inspection happens

Buyers new to this treat third-party inspection as a quality precaution — sensible, optional, a way to sleep better. For a large share of shipments into markets that run a conformity programme, it is neither optional nor really about quality. Under inspection-based programmes such as Kenya’s PVoC, the certificate is not issued on paperwork alone. The body wants evidence that someone competent looked at the actual goods, against the actual specification, before they were sealed into a container, and where the programme requires it, a physical inspection is the step that produces that evidence.

Read that way, the inspection stops being a quality nicety and becomes part of the customs-clearance path. The chain of consequence runs in one direction wherever the programme requires an inspection: no inspection, no evidence; no evidence, no certificate; no certificate, no clearance. And the last link is the one that hurts, because many programmes will not certify a shipment that has already left the country of export, and some will not certify one that has already arrived. Whether that is true of your destination and your product is the first thing to establish, not the last — it decides whether the certificate is a document you collect or a gate you have to plan the whole order around.

Who issues a certificate of conformity — and who does not

It depends on which certificate is being asked for. A manufacturer can sign its own certificate of conformance for an order, and a US importer issues its own CPSC certificate. A certification body issues its certificate within the scope it is accredited or notified for. For a programme certificate, the destination programme decides which body issues the document, and the industry’s language blurs that constantly. The table covers that case.

A supplier that says it “has COC” usually means certificates were issued for earlier shipments, or that its product has test reports a body has accepted before. An agent that says it “does COC” means it handles the application. Neither is the same as being able to issue one, and neither transfers to your shipment on its own. When you are told a certificate is covered, the useful follow-up is always the same: covered by which body, against which shipment.

The guide to third-party inspection companies in China compares firms handling conformity certificates and the other services each offers.

What a certificate of conformity must contain

A programme, a regulation or a contract may prescribe the form, and where it does, that form applies. Where nothing is prescribed, a certificate you can rely on carries:

• The issuer — name, address, and the basis it issues on: its appointment, accreditation or notified-body number where one applies.
• A certificate number, with the date and place of issue.
• The goods — product name, model or type, and the serial numbers, batch, quantity, purchase order or shipment it covers.
• The requirements — each standard, regulation or contract specification, with its edition or date.
• The evidence — the test reports or inspection relied on, with their numbers, the laboratory or inspector, and dates.
• For a programme certificate — the importer and exporter, and the scope and validity the programme gives it.
• A named signatory — signature, name and position.

The CPSC sets seven required elements for US certificates: the product, with at least one unique identifier; each safety rule it is certified to; the importer or manufacturer certifying it; the person keeping the test records; the month, year and place of manufacture; the date and place of the most recent testing, including any third-party laboratory; and the certifier’s attestation. Since 8 July 2026, importers of most regulated consumer products have to file their certificate data electronically with US Customs and Border Protection.

Certificate of conformity vs certificate of conformance, declaration of conformity and test report

The names overlap and suppliers use them loosely, so go by who signed the document and what it states, not by its title.

For metal products, EN 10204 also names a plain type 2.1 declaration of compliance with the order, which is the manufacturer’s certificate of conformance without test results. For machinery sold into the EU, the Machinery Regulation (EU) 2023/1230 applies from 20 January 2027 in place of the Machinery Directive; the declaration of conformity stays the manufacturer’s document.

How to check a certificate of conformity from a Chinese supplier

• 1. Identify the issuer and what entitles it to issue — a certificate the supplier signed is the supplier’s own word. For a third-party certificate, confirm the body may issue it: an EU notified body’s four-digit number in the Commission’s NANDO database, a laboratory’s accreditation and its scope in the accreditation body’s directory (CNAS for laboratories in China), a CPSC-accepted laboratory on the CPSC list, a programme agent on the programme’s own list.
• 2. Confirm the certificate with the issuer — ask it to confirm the number, holder, product and status, or use its online register where it has one. A certificate the issuer cannot find is not evidence.
• 3. Match it to your goods — certificate holder and manufacturing site, model and variant, ratings, and dates. A certificate for a sister model, another factory or an earlier revision does not cover yours.
• 4. Read the evidence behind it — test report numbers, laboratory, the sample tested, the standard and its edition. A report often covers one sample from a range.
• 5. Check the goods — the nameplate, marking and labels on what is actually packed must match the documents. That check happens at the factory, before shipment.

Three documents often arrive from Chinese suppliers under the name “COC”, and none of them is a third-party certificate for your market:

• A 产品合格证 (chǎnpǐn hégézhèng, product conformity certificate) — the factory’s own pass certificate, often packed with the goods. It records that the item passed the factory’s inspection, to the factory’s standard.
• A CCC certificate — China Compulsory Certification, for products sold in China. It says nothing about your destination’s rules.
• A “CE certificate” from a testing company that is not a notified body — a voluntary document with no legal standing for CE marking. Where the EU route is self-declaration, the legal document is the manufacturer’s EU declaration of conformity, backed by its technical file; where a notified body is required, check its number in NANDO.

The sequence, and why the order decides the schedule

Where a certificate is required, each step produces an input the next one needs. The list follows the route in which the authorised body inspects the goods itself. Where a programme instead accepts another inspector’s report, steps 4 and 5 come first and the report goes with the request in step 3:

• 1. Establish whether this destination requires a certificate for this product — ideally before the order is placed, because the answer can change what the factory has to build.
• 2. Goods finished and ready — the inspection evidence describes only the goods presented for inspection.
• 3. Request for certification lodged with the authorised body — with the supplier’s documents and the importer’s destination-side documents, so the body can schedule its inspection.
• 4. Physical inspection at the factory — goods, quantities, markings, labelling and documents checked against the specification and the destination’s requirements.
• 5. Findings closed and evidence complete — findings closed out with the supplier, so the evidence the body relies on is not contradicted by an open issue.
• 6. Certificate issued before departure — the vessel can be booked earlier, but wherever the programme requires certification before departure, the goods leave only after the certificate is issued.

The constraint is visible from the shape of the list: everything from step 3 onward sits between “the goods are ready” and “the goods can sail”. A buyer who books the vessel first and asks about the certificate afterwards has already built a schedule with no room in it.

Step 1 is the one that gets skipped, and it is the expensive one to skip, because destination requirements can reach back into what is manufactured: the marking moulded or printed on the product, the language of the label and the user manual, the plug, voltage or frequency variant, and the age and scope of the test reports the body will accept. A factory selling standard stock built for its own market may be producing goods that cannot be certified for your destination at all — and some of that is not correctable once tooling is cut. Those questions belong in supplier qualification and in the technical file, not at the shipping desk.

What the certifying body needs, and who has to produce it

An application is assembled from both ends of the trade, which is exactly why it stalls. The supplier side is usually routine. The destination side is not, because only the importer can produce it.

• From the supplier — the commercial documents for the shipment, the product’s test reports and any product certificates, technical documentation, and evidence of the marking and labelling as actually applied to the goods.
• From the importer — the destination-side import document that identifies the importer and the consignment, the importer’s registration details in the destination country, and confirmation of the standards or product categories the goods are being declared under.
• From whoever inspected the goods — the inspection evidence: what was examined, against what, what matched, what did not, and what was corrected before release.

In practice the most common cause of a stalled application is a buyer who was asked for the destination-side document and has not sent it — usually because nobody explained that the application cannot begin without it. If someone is coordinating the certificate properly, that request reaches you early and it is specific about which document it means.

Where certificate applications go wrong

• The application is left until after the goods have shipped — the most common failure and the most expensive, because where a programme certifies only before departure there is no correction available downstream.
• The test reports are too old, or cover a different variant — a report the supplier has used for years may fall outside what the body will now accept, or may describe a model that is not quite the one you ordered.
• Marking, labels and manuals are not in the form the destination requires — some destinations specify the language of labels and user documentation, the country-of-origin marking, or marks that must be physically present on the product. Discovered at the factory this is a delay; discovered at the port it is a refusal.
• The documents do not reconcile — invoice, packing list, test reports and the marking on the goods have to describe the same items. A body that cannot trace one to the next will not certify what it cannot follow.
• The certificate is treated as the supplier’s problem — it is issued for the importer, on documents only the importer holds. A supplier can support the application; it cannot own it.