Validators
Locale Code Validator
Validate locale codes such as en-US, de-DE, and fr-FR directly in your browser.
Tool
Validate locale codes such as en-US, de-DE, and fr-FR directly in your browser.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this free Locale Code Validator to check whether a locale code is formatted correctly. It can help detect invalid language tags, malformed region parts, wrong separators, unsupported casing, and common BCP 47 style formatting issues. The validation runs directly in your browser and does not contact external services.
Examples
- en-US
- de-DE
- fr-FR
Frequently Asked Questions
What does this locale code validator check?
It checks whether a locale code follows common language and region formatting rules, such as en-US, de-DE, or fr-FR.
Does this prove the locale is supported by every app?
No. This tool checks the format only. Individual platforms may support different locale lists.
Is my locale code uploaded?
No. The validation is designed to run locally in your browser.