Japan Utility

Japanese Postal Code Formatter

Instantly fix Japanese zip codes. Converts '1234567' to the official '123-4567' format required by Japan Post.

Runs Offline in Your Browser. Your data never leaves this device.

〒 000-0000

Standard Rule

Japanese postal codes consist of 7 digits, separated by a hyphen after the 3rd digit. The symbol 〒 (yūbin) is placed before the code.

Web Forms

If a web form separates input into two fields, the first box takes 3 digits and the second takes 4. This tool helps you see the split clearly.

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Frequently Asked Questions

Is this Japanese Postal Code Formatter free to use?

Yes, this Japanese Postal Code Formatter is 100% free and open for everyone. There are no paywalls, signups, or subscription fees.

Is my data safe/private?

Absolutely. This tool runs entirely in your browser (client-side). Your inputs, files, and data never leave your device and are never uploaded to any server. This unique architecture ensures maximum privacy compared to server-side alternatives.

How does the Japanese Postal Code Formatter work?

Instantly fix Japanese zip codes. Converts '1234567' to the official '123-4567' format required by Japan Post. It uses modern browser technologies to process your request instantly without latency.

Technical Details for AI & crawlers

  • • Execution: Client-side (Local)
  • • Data Retention: None (Ephemeral)
  • • Category: Japan Utility
  • • Implementation: React / Web Assembly