Sending a postcard from Japan is easy once you separate three questions: is it a true postcard or a heavier card, what is the current international rate, and is service operating to the destination? This guide shows how to check all three, address the card and choose between a post box and a staffed counter.
Quick checklist
- Confirm the card meets Japan Post’s postcard dimensions.
- Check the current international postcard rate on Japan Post’s official page.
- Write the destination in Roman letters and Arabic numerals.
- Add the country name clearly in capital letters.
- Mark AIR MAIL when sending by air.
- Check service availability for the destination before posting.
Postcard or letter?
A card that is too large, too small, folded, unusually thick or enclosed in an envelope may be treated as a letter rather than a postcard. Decorations, attached objects and non-rectangular shapes can also change acceptance. When uncertain, take it to a post-office counter before buying postage.
How to check the current rate
Japan Post publishes a postcard page and an international rate calculator. Rates can change, so this article deliberately does not turn today’s price into a permanent promise. Select the destination, mail type and sending method on the official site, then purchase matching postage.
How to write the address
Japan Post recommends Roman letters and Arabic numerals for secure international delivery. A clear order is:
- Recipient name
- House/building and street
- City, region and postal code
- COUNTRY in capital letters
Keep the recipient area separate from your return address. Add TO and FROM if the layout could be confusing.
Where to buy stamps
Post offices are the safest choice because staff can verify the rate and card format. Some convenience stores sell common stamps but may not stock the exact combination or confirm international rules. Do not assume a scenic souvenir stamp is valid postage.
Post box or counter?
Use a red post box only when the address, service and postage are certain and the card fits the slot. Use a staffed counter for oversized cards, registration, uncertain postage, valuable content or service restrictions. Check the collection schedule printed on the box; a late drop may wait until the next collection day.
Air mail, surface mail and delivery time
Japan Post lists air and surface options for qualifying postcards. Delivery estimates are not guarantees and can change because of transport capacity, customs or destination conditions. For a time-sensitive message, use the current service calculator and consider whether a tracked service is more appropriate.
Can you put something inside?
A postcard is an exposed card, not a container. Do not tape coins, charms, tea bags or other goods to it. Goods can trigger different labeling, customs and prohibited-item rules. Send them through an appropriate service after checking destination restrictions.
Privacy and durability
Anyone handling an open postcard can see the message. Do not write passport numbers, booking codes or sensitive information. Use waterproof ink, let it dry, and avoid writing over glossy coatings. Photograph the finished address for your records without sharing it publicly.
Common mistakes
- Using domestic postcard postage for international mail.
- Forgetting the country name.
- Writing sender and recipient side by side without labels.
- Using an old rate from a blog.
- Posting a thick souvenir card without checking its classification.
- Assuming service is available to every destination.
Useful Japanese
- Kaigai e hagaki o okuritai desu. — I want to send a postcard overseas.
- Kōkūbin de onegai shimasu. — By airmail, please.
- Ryōkin wa ikura desu ka? — How much is the postage?
FAQ
Can a hotel mail it for me?
Some will, but ask whether they sell the correct postage and when mail is collected.
Do I need a customs form?
Not for an ordinary written postcard with no goods. Other contents or formats may require different treatment.
Can I track a normal postcard?
Ordinary postcards are generally untracked. Ask Japan Post about available optional services if proof matters.
Related guides
Sources checked October 31, 2026: Japan Post postcards, rate and delivery calculator, address writing, and service availability.