Stamp a Contract PDF Without a Printer — Page Seals and All
Ever lost half a day to putting one stamp on a contract? You print the PDF that arrived by email, stamp every page, scan it all back in, then merge the loose scans into a single PDF to send back — a four-leg round trip. If you run a small business, the sealing never ends: service agreements, government grant paperwork, participation confirmations. And of course the printer is out of ink (or missing entirely) on the day the deadline lands, sending you off to hunt for a print shop.
Here is the short answer: make one seal image (a transparent PNG), and the entire round trip disappears. You stamp the PDF right on screen, without the document ever touching paper. Below is that zero-paper, zero-ink, zero-scanner workflow — along with a quick guide to the seal terminology that trips everyone up.
Gan-in? Gye-in? — Korean seal jargon in 3 minutes
The first thing that stops people is not the stamping itself but the vocabulary. A request like "please add the gan-in" sends most of us straight to a search engine, unsure where the stamp even goes. Here are the four terms you will meet most often.
| Term | What it means | Where it goes | Why |
|---|---|---|---|
| Nal-in (name-and-seal) | The basic stamp placed next to your name in the signature block | The "(seal)" spot at the end of the contract | The core expression of intent to contract |
| Gan-in (page-joining seal) | Marks a multi-page document as one single document | Straddling the joint between consecutive pages, on every page | Prevents page swapping |
| Gye-in (counterpart seal) | Marks two copies of the same contract as a matched pair | Straddling the touching edge of the two copies laid side by side | Proves your copy and the other party's copy are the same document |
| Certified-true-copy stamp | Declares "this copy has been checked against the original" | No fixed position — any margin that does not cover the text | Certifies a submitted copy matches the original |
But is an image stamp even valid?
This is the worry everyone has, and there is a statute that answers it. Article 3 of South Korea's Digital Signature Act (Korean-language page) provides that an electronic signature shall not be denied effect as a signature, signature-and-seal, or name-and-seal solely because it is in electronic form. And since contracts are generally formed by the parties' mutual assent, exchanging PDFs stamped with a seal image is already common practice — it is the same legal footing that e-signature services stand on.
3 steps to seal without a printer
All you need is one seal image. Both cases are covered — whether you own a physical seal or not.
Prepare your seal image
If you own a physical seal — stamp it crisply on white paper, then photograph it in bright, shadow-free light or scan it. If you do not have a seal yet — the stamp generator turns a name of one to four Korean (Hangul) or Chinese characters into a document-ready transparent PNG seal (Latin letters aren't supported — that's what real Korean seals look like). Need a handwritten-style signature instead? There is a signature generator too.
Erase the white background to get a transparent PNG
A photographed or scanned seal still carries its white backdrop, and dropped onto a PDF as-is, that white box covers the contract text. Upload it to the image background remover and one click gives you a transparent PNG with the backdrop gone. This is the step that decides how professional the result looks.
Place it on the PDF, right where it belongs
Load the contract PDF and your transparent PNG into the PDF stamp & signature tool, drag the seal onto the "(seal)" spot in the signature block, and you are done. You can resize it and place it where you want on each page, and turning on "Apply to all pages" stamps every page in the same spot at once — a handy digital stand-in for a page-joining seal (gan-in). The files are processed entirely inside your browser — your contract never leaves your device. If you end up with several sealed documents, merge PDF bundles them into one tidy file for submission.
- Before — print → stamp → scan → sort loose pages → merge PDF → reply (printer and scanner required)
- On-screen stamping — drop the seal PNG, stamp, save → reply (printer and scanner used zero times)
Who benefits most
- Small businesses and freelancers — service agreements and NDAs fly back and forth by email, but there is no multifunction printer in the office.
- Government grant applicants — participation confirmations and program agreements have to be uploaded as sealed PDFs; this workflow produces the submission file with no paper round trip.
- Urgent sealing while remote — you can return a signed contract from a café with nothing but a laptop.
- Anyone submitting lots of certified copies — turn your certified-true-copy stamp into a transparent PNG once, and stamping the same spot on every copy becomes trivial.
3 easy mistakes to avoid
Wrap-up — one seal PNG replaces your printer
The bottleneck in sealing paperwork was never the seal — it was the trip through paper. Set it up once in this order: stamp generator (or a photo of your real seal) → background remover → PDF stamp & signature. From the next contract on, you stamp it on screen the moment it arrives and send it straight back. Everything is free with nothing to install — and the stamping step itself never sends your contract to a server.
Curious about the legal basis for electronic sealing? Read Article 3 of the Digital Signature Act (Korean-language page) at Korea's National Law Information Center.