Japan Utility

Full-width ↔ Half-width Converter

Fix rejected web form entries. Convert 'ＡＢＣ' to 'ABC' (Zenkaku to Hankaku) and vice-versa instantly.

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

Half-width (Hankaku)

a b c . . .

Full-width (Zenkaku)

ａ ｂ ｃ ． ． ．

Why is this happening?

Many Japanese database systems were built years ago and strictly regulate the "width" of characters. For example, bank forms might reject standard numbers "123" and demand "１２３" instead. This tool solves that mismatch in one click.

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Frequently Asked Questions

Is this Full-width ↔ Half-width Converter free to use?

Yes, this Full-width ↔ Half-width Converter 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 Full-width ↔ Half-width Converter work?

Fix rejected web form entries. Convert 'ＡＢＣ' to 'ABC' (Zenkaku to Hankaku) and vice-versa instantly. 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