Japan Postal Code Lookup
Convert postal codes to addresses instantly—no API required.
Reverse lookup and English romaji format supported.
Cultural Note
This tool is based on Japanese cultural, legal, or administrative standards. Calculations and terminology may not apply outside Japan.
Supports business numbers. 3-split copy and English Romaji format generation available.
Input is cleansed automatically. Finds exact postal codes from messy addresses.
* Note: The output can be pasted directly into Excel or Spreadsheets to form clean columns.
🔒Address data is never sent to a server. Processing over 140,000 records instantly within your browser.
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
Search or Bulk Convert
Use the single search, paste an entire list for bulk conversion, or use power mode for rapid fire lookups.
Get Format Variations
You can copy the entire address, or use split-copy buttons to paste into divided web forms.
English ROMAJI Format
Click the English copy button to instantly get an internationally valid Romaji address sequence.
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
- Q.Peut-il vraiment interroger plus de 140 000 enregistrements instantanément ?
- Oui! L'outil charge un fichier JSON optimisé dans la mémoire du navigateur lors de la première recherche, garantissant ainsi zéro temps d'attente et zéro suivi du navigateur.
- Q.Qu’est-ce que le mode d’alimentation du clavier ?
- Un mode spécial déclenché par l'icône ⚡, destiné aux opérateurs de saisie de données. Cela supprime le besoin d'une souris, vous permettant de taper et d'appuyer sur Entrée pour copier les résultats à plusieurs reprises.
- Q.Puis-je utiliser la chaîne anglaise pour Amazon US ou Aliexpress ?
- Oui, le format fourni correspond parfaitement aux normes d’expédition internationales. Il vous suffira d'ajouter votre numéro d'appartement/chambre au tout début.
Cas d'utilisation
International Shopping
Smoothly fill out Amazon US shipping forms.
Form Input Automation
Use split-copy to blaze through 3-part address fields.
Excel Data Cleansing
Convert and organize thousands of postal codes instantly.
Customer Support
Find residential zones while actively talking with customers.