As the end of the year approaches, the pile of contracts that need ganin grows fast. Stamping ganin on two copies of a 20-page contract, you start to wonder: "Do I really have to do this?"
The short version
Ganin (a seal stamped across the boundary of two adjacent pages) is a customary practice to prevent page swapping, not a requirement for a contract to be formed. A contract is valid without ganin, but in a dispute it may be harder to prove that a given page belonged to the original contract. In an e-contract, locking the document after signing and the audit trail certificate take over the role of ganin, so ganin isn't needed.
Ganin, gyein and nal-in: the differences
| Type | Where it's stamped | Purpose |
|---|---|---|
| Nal-in (signature seal) | On the signature line, next to the party's name | Shows agreement to the contract's contents |
| Ganin (page-joining seal) | Across the boundary where the front and back pages meet | Shows the pages are connected as one document |
| Gyein (counterpart seal) | Across two copies of the contract laid on top of each other | Shows the two copies have identical contents |
How to stamp ganin
- Arrange the contract pages in order.
- Fold or spread the pages so the back of page one overlaps the front of page two.
- Stamp so that half of the seal lands on each page.
- Repeat through the last page.
- Use the same seal used for nal-in (the registered corporate seal or the business seal).
If there are many pages, people sometimes bind the contract and stamp a single ganin across the cover and back, or replace it with perforation (punching holes).
What replaces ganin in an e-contract
- Legal effect: Korea's Framework Act on Electronic Documents and Transactions provides that a document cannot be denied effect solely because it is an electronic document, and the Digital Signature Act applies the same principle to electronic signatures.
- Tamper prevention: Once signed, the document is locked, so any change to its contents can be detected. Page swapping is structurally difficult.
- Evidence: An audit trail certificate records who signed, when, and through which verification. That's more specific evidence than ganin.
When an e-contract isn't the right fit
- Guarantee (suretyship) contracts: Article 428-2 of Korea's Civil Act provides that a declaration of intent to guarantee expressed only in electronic form has no effect. However, a guarantee made by the guarantor as part of their trade or business is deemed to be in writing even as an electronic document (Electronic Documents Act, Article 4(2)). If it doesn't fall under that exception, as when an individual company representative signs a joint and several guarantee, get a name and seal or a signature on paper.
- When the counterparty wants paper: Public institutions and some large corporations require paper originals under their internal rules. Check in advance.
- When you only sign a handful a year: Paper may simply be easier than bringing in a separate e-contract tool.
What eats more time than ganin
In the year-end contract season, what really eats time isn't the stamping. It's answering "where's the final version of last year's contract with that vendor?" When scans, redlines and final versions are mixed together, checking a single renewal term can take half a day.
Based on public materials, PRIX executes contracts with identity verification, e-signatures and audit trail certificates, and then has AI extract key information from the executed contract for storage and search (HelloT, Korean). If all you need is a signature, an e-contract service is enough. If you also need storage, search and expiration management after execution, it's worth looking at a contract lifecycle management (CLM) system as well.
Alpaca's takeaway
Ganin is nice to have, but skipping it doesn't make the contract void. If your contracts pile up at year-end, you'll save far more time by organizing executed contracts so you can find them instantly later than by saving time on stamping.
🦙 That's it for Researcher Alpaca's research notes. This post is a general summary of information, not legal advice on any specific matter. If anything is wrong or you have more questions, let me know through "Contact Josh" below.
Related posts
- Contract retention periods: statutory periods and company retention rules
- 10 essential clauses in a service contract: what causes disputes when it's missing
Sources
- Framework Act on Electronic Documents and Transactions, Article 4 (Korean Law Information Center, Korean) — effect of electronic documents
- Digital Signature Act, Article 3 (Korean Law Information Center, Korean) — effect of electronic signatures
- Civil Act, Article 428-2 (Korean Law Information Center, Korean) — form of guarantees
- AI-based contract management SaaS 'PRIX' (HelloT, Korean) — identity verification, e-signatures, audit trail certificates, AI clause extraction
