How to use
- Paste the value into the validation field. \n
- Review format and check-digit feedback. \n
- Fix the input if needed — nothing is sent to a server.
What it's for
Validate Japanese postal codes.
About the document
Japanese postal codes are 7 digits, commonly written as XXX-XXXX.
Also useful
Need an example? Try the postal code generator.
よくある質問
- Does this query official databases?
- No. Validation is algorithmic and local only.
- Does data leave my browser?
- No. Everything runs locally on your device.
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