HTML Validator
Catch common HTML mistakes: unclosed tags, duplicate IDs, missing alt text and SEO basics.
● Your files are processed locally in your browser and are not uploaded to our servers.
How it works
KadiTools tokenizes your HTML and tracks open elements to find unclosed, mismatched and stray closing tags, then inspects the document for duplicate IDs, images without alt, links without text, missing <title>, lang, viewport and charset, duplicate attributes and obsolete tags.
It's a fast practical checker, not a full replacement for the W3C Nu validator.
FAQ
Why isn't <p> without </p> an error?
HTML lets some closing tags be omitted (p, li, td, option…). KadiTools only reports them as notes.