HTML Validator sends your markup through a WordPress proxy to the W3C Nu checker so you can catch unclosed tags, obsolete attributes, and accessibility-related messages before publish.
Paste HTML, run validation, then work through the reported issues. Re-run after each batch of fixes until the document meets your bar.
Because checking uses a server proxy, avoid pasting confidential documents that your policy forbids leaving the workstation.
What HTML Validator does
Validate HTML with Nu checker feedback via a WordPress proxy.
- HTML input for documents or fragments
- Validate action through wp-ajax proxy
- Issue list from the Nu checker
- Fix-and-revalidate loop
- Companion to CSS validation and HTML minify
Who HTML Validator is for
- Frontend developers preparing release candidates
- CMS integrators checking generated markup
- Accessibility specialists triaging structural issues
- Students learning valid HTML practices
How to use HTML Validator
1. Open HTML Validator on beeforge.dev.
2. Paste the HTML document or fragment.
3. Run the validate action and wait for proxy results.
4. Fix reported problems in your source, then validate again.
Features
- Nu checker results without installing a local jar
- WordPress-proxied request path
- Actionable issue listing
- Works on snippets and fuller documents
- Fits QA checklists beside CSS validation
Examples
- Validate a WordPress template partial before merging.
- Check a static marketing page after a designer hand-edited markup.
- Teach how missing alt attributes and obsolete tags appear in reports.
Tips and limits
- Fragments may warn about missing html/body wrappers; wrap them when full-document rules matter.
- Some CMS shortcodes look like invalid HTML to the checker; validate rendered output instead.
- Network errors usually mean the proxy or upstream checker was unreachable.
- Confidential HTML should stay on approved tooling per your security policy.
Related tools
- CSS Validator for stylesheet issues in the same pass
- HTML Minifier to shrink markup after it validates
- HTML Encode / Decode when entities need escaping before embed
FAQ
Where is my HTML sent?
Validation goes through a WordPress ajax proxy to the W3C Nu checker. Do not submit secrets or private customer HTML if policy forbids it.
Is every warning a ship blocker?
Teams decide severity. Errors that break parsing usually rank higher than style warnings.
Can I validate a live URL?
This UI centers on pasted markup. Fetch and paste the HTML you need to inspect.
Why do Vue or React templates fail?
Validators expect HTML, not framework template syntax. Validate compiled or SSR output.
Does it check accessibility fully?
It surfaces some structure-related messages but is not a full WCAG audit tool.