JA Tool

JP Postal Lite: Guide

Enter a Japanese postal code and get the matching address (prefecture → town area).

What it does

Looks up a Japanese address from a 7-digit postal code (with or without hyphen)
Helps when a form doesn’t offer auto-fill
Quick copy/paste-friendly output
Browser-only, no storage

Open the tool 日本語ガイド

Use this when

You need to fill Japanese address fields quickly
You want to validate a postal code ↔ area match
You want consistent spelling for the area part of an address

Keywords: Japan postal code lookup, address from zipcode, JP postcode to address

How to use

Enter a postal code (e.g., 100-0001 or 1000001)
Run lookup (button or auto-lookup, depending on the tool)
Copy the result and add street/building details manually

Note: postal codes typically map to the area level, not exact street numbers.

Notes (limits)

Results usually cover prefecture → town area. Street number / apartment is not included.
Changes in postal data (merged towns, renamed areas) can affect results.
Special corporate PO box codes may behave differently.