Korean certified-content mail — write it and print the copies
A Korean certified-content letter is sent as 3 identical A4 copies (the original and two copies) handed in at a post office counter, or as a file uploaded to the Internet Post Office (epost.go.kr).
Write the letter here and the A4 sheet is drawn as you type. Print the copies the counter takes, or save a PDF or Word file to upload. A blank form to fill in by hand prints too. The letter itself is in Korean.
The names and addresses must be the same on the letter, its copies and the envelope (Postal Act Enforcement Rule, Art. 51).
Copies to print
The original goes to the recipient, the post office keeps one copy for 3 years and returns the other to you. The copies are identical; do not mark them.
Preview
내용증명
수신인 성명
수신인 주소
발신인 성명
발신인 주소
제목:
발신인 (인)
The A4 sheet as it will print. Line breaks can differ slightly from the printout.
CheckEnter the sender's name.
CheckEnter the sender's address.
CheckEnter the recipient's name.
CheckEnter the recipient's address.
CheckEnter a title.
CheckWrite the body.
CheckEnter the date.
A print window opens. Choose “Save as PDF” as the printer to keep a file. Sign or stamp beside your name on every copy.
Blank form, to fill in by hand
How it is sent
At a post office counter: hand in 3 identical A4 copies with an envelope addressed exactly as in the letter. The post office checks them against each other, stamps them and seals the original in the envelope in front of you.
Online: the Internet Post Office (epost.go.kr) takes the letter as a file (pdf, hwp, doc, docx and others) on A4 portrait, with margins of at least 20 mm top, 40 mm bottom and 15 mm left and right; this page's margins meet them. It keeps the letter for three years.
A correction on the paper needs a note in the margin saying it is a correction, insertion or deletion and how many characters, with your seal or signature (Art. 50). Reprinting is simpler.
The post office certifies only what was sent and when. Sending one does not by itself have a legal effect, as the Internet Post Office's own guide says.
Fees are not shown here; the counter or the Internet Post Office states them when you send.
Sources: Postal Act Enforcement Rule, Arts. 48–51, on law.go.kr; the Internet Post Office's certified-mail page and guide, on epost.go.kr. Both read on 30 October 2026.
Enter the sender and the recipient exactly as you will write them on the envelope.
Write the title and body in Korean. The A4 sheet under “Preview” changes as you type.
Under “Copies to print”, choose 3 for a post office counter (the original and two copies: Postal Act Enforcement Rule, Art. 48, law.go.kr, checked 30 Oct 2026) or 1 for a file to upload, then press “Save as PDF / Print”.
Sign or stamp every copy and take them to a post office with the envelope, or upload the PDF or the “Word .docx” file on epost.go.kr.
If something goes wrong
If the Internet Post Office will not take the PDF, save it again with headers and footers turned off in the print dialog.
For a letter written by pen, press “Print a blank form” or “Blank .docx”.
A letter form, not legal advice. Whether and what to send is your decision; for a dispute, the Korea Legal Aid Corporation (132) or a lawyer can advise.
What the post office takes and how this page makes itHow this works
What certified-content mail is
In Korea, a letter sent as certified-content mail (내용증명) is one whose content and sending date the post office certifies: it keeps a copy, and the sender keeps another stamped copy. People use it to leave a record of a demand or a notice, such as asking a landlord to return a lease deposit or a customer to pay.
The post office certifies only what was sent and when. Its own guide says that sending one does not by itself have a legal effect. Whether it helps in a dispute depends on the case; the Korea Legal Aid Corporation (132) or a lawyer can advise.
What a post office counter needs
Under the Postal Act Enforcement Rule, the sender hands in the original and two copies, three sheets of the same letter on A4 paper (Articles 48 and 49). The original goes to the recipient in a sealed envelope; the post office keeps one copy for three years from the day after sending and returns the other to the sender. A sender who needs no copy may hand in the original and one copy.
The names and addresses on the letter, its copies and the envelope must be the same (Article 51). A correction on paper needs a note in the margin with the number of characters changed and the sender's seal or signature (Article 50), so reprinting is simpler. The copies must be copies of the original, which is why this page prints them identical, with no original or copy label.
Writing the letter
Enter the sender and recipient, a title, the body and the date. The body prints exactly as typed, line breaks included, under the title and above the date and the sender's name with a place for a seal. The letter is a Korean document, so write it in Korean. The Korean version of this page offers three starting outlines (a lease deposit refund, a payment request, a contract termination): headings and bracketed gaps, with no legal wording. An outline only goes into an empty body, and the checks list any brackets left unfilled.
Empty fields are listed under Check as you type. They never stop you printing.
Printing, Word and the Internet Post Office
Choose how many copies to print: 3 for a counter, 2 when you need no copy, or 1 for a file. Each copy starts on a new sheet. “Save as PDF / Print” opens the print dialog; “Word .docx” saves the letter as a Word file made in your browser. A blank form, with lines to write the body by hand, prints and downloads the same way.
The Internet Post Office (epost.go.kr) accepts the letter as an uploaded file, including PDF and Word, on A4 portrait with margins of at least 20 mm at the top, 40 mm at the bottom and 15 mm at the sides. This page uses 25, 40 and 20 mm, and its Word file has no header or footer. A file with page numbers or footers cannot be uploaded, so when saving a PDF, turn off headers and footers in the print dialog. Fees are not shown here; the counter or the site states them when you send.
Your data
Everything is made in your browser. Nothing you type is sent and nothing is stored: closing the page clears the letter. As on every tool page here, one count is sent when you print or download: which tool was used and in which language, with nothing from the letter in it.
This page fills in a letter; it does not give legal advice or say what to write. The rules above were read on law.go.kr and epost.go.kr on 30 October 2026.
How many copies does a Korean post office need for certified-content mail?
Three identical A4 copies: the original and two copies (Postal Act Enforcement Rule, Article 48). The original goes to the recipient, the post office keeps one copy for three years and returns the other to you. If you need no copy, the original and one copy are enough. Choose the number under “Copies to print”.
Can I send it online instead of going to a post office?
Yes. The Internet Post Office (epost.go.kr) accepts the letter as an uploaded file, including PDF and Word, on A4 portrait with margins of at least 20 mm top, 40 mm bottom and 15 mm left and right. This page's margins meet them. Save one copy and turn off headers and footers in the print dialog, because a file with page numbers or footers cannot be uploaded.
Does sending it make my demand legally binding?
No. The post office certifies only what was sent and when; its own guide says that sending one does not by itself have a legal effect. It is a record. For a dispute, the Korea Legal Aid Corporation (132) or a lawyer can advise.