Free · Accessibility · Browser-based
HTML Language Attribute Checker
Detect a missing page language declaration in pasted page markup.
Scope: Detection cannot prove that localized text and language changes are marked correctly.
Try the tool
Your result appears here after you run the tool.
Private by design: tool input and output are processed within your browser. Do not paste secrets or sensitive data into any online page. No account required.
How to use this tool
Include the opening HTML tag and check that its lang value matches the real language.
Review the result yourself before using it in an operational process or publishing it. The output is intended to be edited and checked against actual facts and applicable requirements.
Practical example
An English-language HTML document should declare lang="en".
What this result does not establish
Detection cannot prove that localized text and language changes are marked correctly. A passing heuristic check or a generated document never certifies legal, security or accessibility compliance.