A practical guide for foreign companies: Corporate seals in Korea

What is a corporate seal?

A corporate seal (also sometimes known as a company seal or company stamp) is the company’s official stamp registered with the competent court registry office in Korea. In Korean business practice, it performs the function of the company’s signature. The registry issues a seal certificate for the registered seal, and counterparties verify a document’s authenticity by comparing the seal impression on the document against that certificate.

In practice, companies often also maintain a working seal, an unregistered seal for day-to-day business, supported by a declaration bearing the registered seal. Even under a working-seal arrangement, everything ultimately traces back to strict control of the registered corporate seal.
 

Cultural and institutional background: Why Korea still runs on seals

Korea, Japan, Taiwan and other East Asian jurisdictions share a seal culture spanning many centuries. While the handwritten signature became the standard means of authentication in the West, East Asia developed document authentication around official and private seals. This tradition evolved into the modern seal-registration system.

Even with the spread of electronic signatures, Korean corporate practice still calls for the registered seal and its certificate at critical junctures: real estate transactions, corporate registry filings, banking, major contracts, and powers of attorney. For foreign companies accustomed to wet-ink signatures, the system can feel unfamiliar, but it is unavoidable infrastructure for doing business in Korea.

Key points:  In Korea, the corporate seal is not office supplies. It is the instrument through which the company expresses its will to the outside world. Managing the seal means managing the company’s signing power.
 

Why it matters: The weight carried by one stamp

• Strong role in establishing document authenticity: In Korean transactional and dispute practice, a document bearing a genuine registered-seal impression is very likely to be accepted as executed by the company, which, in practice, means that a sealed document tends to bind the company.
• The default trust benchmark: Banks, government offices, and counterparties commonly treat the seal impression plus seal certificate as the primary evidence of corporate intent.
• Gateway to statutory procedures: Registry filings such as director changes, head-office relocation, or capital increases typically require the registered seal; without it, even routine statutory steps stall.
   

Key risks: Loss, damage, and misuse

Loss or theft

• Seal-dependent operations — contract execution, registry filings, banking — can come to a complete standstill.
• Re-registration of a new seal and notifications to banks and counterparties create a significant administrative burden.
• If the loss is not detected promptly, there is a risk that an unauthorized third party could use the seal before appropriate protective measures are taken.

Damage or wear

• If the impression no longer matches the specimen registered with the registry, filings may be rejected, and documents may need to be re-executed.
• Wood or resin seals can wear or crack over time, making storage conditions a real operational issue.

Misuse and unauthorized affixation — the risk to watch most closely

Whoever physically holds the seal can produce documents that appear fully executed, regardless of whether internal approval was ever given. If an employee or officer affixes the seal without authority — to a contract, guarantee, or power of attorney in the company’s name — the company may find itself drawn into disputes or facing obligation claims it never intended.

• For foreign companies whose headquarters are overseas, real-time visibility into local seal usage is difficult, and control gaps widen easily.
• Internal and external audits frequently ask for an account of seal usage; without a usage ledger, that account is hard to give. 

Control-gap scenarios that are easy to miss

Blank-document sealing

For convenience, seals are sometimes affixed in advance to unfinished documents or even blank pages. If the content is later filled in or altered, a document the company never intended can end up looking fully executed. This is a distinctly Korean practice risk that is hard to imagine in a signature culture.

The seal as "hostage" — disputes with the custodian

When the representative director or a particular staff member personally keeps the seal, and a dismissal, management dispute, or labor dispute arises, custodians have in practice refused or delayed returning the seal. The seal effectively becomes a bargaining chip with the company’s contracts, filings, and banking held captive.

Departure and handover gaps (Key person risk)

Where custody and use of the seal are concentrated in one person, that person’s sudden resignation or unreachability leaves a vacuum: no one can say where the seal is or what it has been used for. This pattern is especially common at foreign-invested companies with small local teams.

Ad-hoc sealing when the approver is overseas

When decision-makers sit at overseas headquarters, urgent requests invite a "stamp first, report later" workaround. Repeated, it hardens into a de facto no-approval practice — a textbook case of time-zone and distance gaps turning into control gaps.

Key points:

• Can you say, right now, exactly where your corporate seal is?
• Do you have a record of every document it was affixed to in the last three months?
• Is there a documented approval step before any affixation?  If any answer is “no,” it is time to review your controls.
   

Sound principles of seal governance

• Separate custody from approval: The person who keeps the seal should not be the person who approves its use — separation blocks unilateral misuse.
• Pre-approval workflow: No affixation without an approval that identifies the document, purpose, and requester.
• Continuous usage records: Maintain a seal usage ledger (date, document, requester, approver) and reconcile it periodically.
• Two-seal structure: Use a working seal for routine business and reserve the registered seal for critical documents, minimizing its exposure.
• Secure physical storage: Locked storage, access control, and environmental care against damage.
   

Triple safeguards — custody + approval + records

To address the above risks, we provide a corporate seal safekeeping service that lets foreign companies implement all of the above without maintaining their own local administrative staff.

• Secure custody: Registered and working seals are kept in a controlled, secure environment.
• Designated approver system: No affixation takes place without approval from the approver you designate — for example, an officer at your headquarters.
• Full logging and tracking: Every affixation request and its handling is recorded, giving you an audit-ready usage history.
• Working seal services: Creation, custody, and affixation handling for working seals under the same approval-and-record framework.

For an overseas headquarters, this means standing visibility: where the Korean subsidiary’s seal is, and what it has been used for — at any time.
 
This material is provided for general informational purposes regarding Korea’s corporate seal system and to introduce our administrative custody and management services. It does not constitute legal advice. For legal questions concerning specific matters, please consult a qualified attorney or other appropriate professional.