Write a Japanese address in English
Overseas forms, shipping labels, visa applications and online shops all want a Japanese address in the reverse order, in romaji. This builds it from Japan Post’s own data and fixes the spelling slips that data is known for.
- Runs entirely in your browser
- Works offline
- No upload
- No sign-up
- No watermark
Loading the tool…
How it works
- Type the 7-digit postcode, or paste the address in Japanese (東京都千代田区丸の内1-2-3…).
- Check the block number (丁目・番地・号) and type the building and floor the way the building writes them in English; add the room.
- Copy the one-line version, each form field, or the label.
Why nothing is uploaded
Every operation on this page is done by code running inside your browser tab, using the same engine that renders web pages. The file is read from disk into your tab’s memory, transformed there, and written back out as a download. It is never sent anywhere — not to us, not to a third party.
Verify it yourself
- Open your browser’s developer tools (F12) and select the Network tab.
- Load your file and run the tool.
- The only requests you will see fetch the tool’s own code — and, for a few heavy tools, their open-source engine (also from this site) or an AI model from Hugging Face — plus one small page-view ping to loreatec.jp (page address and title, nothing more). None of them carry your file.
Frequently asked questions
In what order does a Japanese address go in English?
Smallest to largest, the reverse of Japanese: room and building, then the block number and town (1-2-3 Marunouchi), the ward or city (Chiyoda-ku), the prefecture with its postcode (Tokyo 100-0005), and JAPAN. In a city with wards, the ward comes before the city: Kita-ku, Osaka-shi.
Is the romaji spelling reliable?
It comes from Japan Post’s romaji edition, with its known slips fixed: notes in brackets that Japan Post also romanizes are removed, about 650 towns written with の内 get “nouchi” instead of Japan Post’s “nochi” (Marunouchi, not Marunochi), and the 4,000-odd entries Japan Post leaves without romaji are romanized from their kana. Town names still have usual spellings no rule can know, so the reading is shown for you to check.
What about the building name?
Use the English name the building itself uses (on its sign or website); if it has none, the Japanese name is fine — mail from abroad is sorted by postcode and delivered by Japanese staff who read it either way. Floors become “12F” and room numbers “#1203”.
Is my address sent anywhere?
No. The postcode data (about 1.6 MB) is downloaded once from this site and searched inside your browser; the address you type never leaves it.