Can it really query 140,000+ records instantly?

Yes! The tool loads an optimized JSON file into the browser memory upon first search, ensuring zero wait times and zero server tracking.

What is Keyboard Power Mode?

A special mode triggered by the ⚡ icon, designed for data-entry operators. It removes the need for a mouse, letting you type and hit Enter to copy results repeatedly.

Can I use the English string for Amazon US or Aliexpress?

Yes, the provided format perfectly matches international shipping standards. You will just need to append your apartment/room number at the very beginning.

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postal code,

Japan Postal Code Lookup

Convert zip codes to addresses instantly—no API required.
Reverse lookup and English romaji format supported.

🔒

No API Required

Fully offline search

⚡

Bulk & English

Romaji format & Excel bulk convert

🔄

Reverse Lookup

Search ZIP from business or address

Postal Code (7 digits)

〒

Supports business numbers. 3-split copy and English Romaji format generation available.

🔒Address data is never sent to a server. Processing over 140,000 records instantly within your browser.

about,

About

This isn't just a simple postal code search. It includes advanced features like "3-Split Copy" for web forms, "English Romaji format generation" for international shipping, "Bulk TSV processing" for Excel, and a "Keyboard Power Mode" for professionals. Built with a specialized packing algorithm, it loads over 140,000 real Japan postal codes right into your browser's memory, ensuring zero latency and maximum privacy.

how to use,

How to Use

STEP 1

Search or Bulk Convert

Use the single search, paste an entire list for bulk conversion, or use power mode for rapid fire lookups.

STEP 2

Get Format Variations

You can copy the entire address, or use split-copy buttons to paste into divided web forms.

STEP 3

English ROMAJI Format

Click the English copy button to instantly get an internationally valid Romaji address sequence.

glossary,

Glossary

Romaji Address Format: A Western-style address structure starting from the narrowest location (Town) up to the Prefecture, separated by commas. Instantly generated by this tool.
Business Postal Code: A special postal code assigned to large enterprises or government buildings that handle high mail volumes. Can be reverse-searched.
Address Cleansing: The process of automatically removing half-width/full-width noise and formatting addresses correctly during reverse lookups.

faq,

FAQ

Q.Can it really query 140,000+ records instantly?: Yes! The tool loads an optimized JSON file into the browser memory upon first search, ensuring zero wait times and zero server tracking.
Q.What is Keyboard Power Mode?: A special mode triggered by the ⚡ icon, designed for data-entry operators. It removes the need for a mouse, letting you type and hit Enter to copy results repeatedly.
Q.Can I use the English string for Amazon US or Aliexpress?: Yes, the provided format perfectly matches international shipping standards. You will just need to append your apartment/room number at the very beginning.