W3C I18n Checker
Validate by URI

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Validate by File Upload

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This checker performs various tests on a Web Page to determine its level of internationalisation-friendliness. It also summarises key internationalization information about a page, such as character encoding and language declarations, etc. Please refer to the About page for more details.

If you wish to validate specific content such as markup validation, mobileOK, RSS/Atom feeds, CSS stylesheets, or to find broken links, there are other validators and tools available.