Yes, completely free with no signup and no usage limits.

Does my data leave my device?

No. All lookups and validation run in JavaScript inside your browser. Nothing is sent to any server.

Does it work on mobile?

Yes. The tool is mobile-first and works on iPhone Safari and Android Chrome.

世界各国の郵便番号形式とregexパターンを調べ、任意の郵便番号を検証できます。

Country Validate a postal code

Select a country from the dropdown to see its postal code format and an example.
Type a postal code into the validation field to check if it matches the format.
The result shows whether the code is valid or not for the selected country.

Is this tool free?: Yes, completely free with no signup and no usage limits.
Does my data leave my device?: No. All lookups and validation run in JavaScript inside your browser. Nothing is sent to any server.
Does it work on mobile?: Yes. The tool is mobile-first and works on iPhone Safari and Android Chrome.

Last updated: 2026-05-20 By jarvisbox