No. This is a practical linter focused on the most common real-world issues. The W3C Markup Validator performs exhaustive spec compliance checking and is the authoritative source for formal validation.
Find unclosed and mismatched tags with exact line numbers, auto-repair broken markup structure, check for deprecated tags against your declared DOCTYPE, and beautify or minify — all in your browser.
<script>, <style>, comments, and
<textarea>, where false positives are most common.
Any fragment or full document — select your DOCTYPE for accurate linting.
Every problem is listed with its exact line number and explanation.
Repair structure automatically, or switch tabs to beautify or minify.
<pre>, <script>, <style>,
and <textarea> exactly as written.
No. This is a practical linter focused on the most common real-world issues. The W3C Markup Validator performs exhaustive spec compliance checking and is the authoritative source for formal validation.
It feeds your HTML through the browser's own built-in parser — the same forgiving parsing every browser already applies when rendering broken pages — then serializes the corrected structure back into clean text.
Text inside script, style, textarea, and comments is never parsed as markup by real browsers, even if it looks like a tag. This tool applies the same rule to avoid false positives.
No. Everything happens entirely in your browser. Nothing you paste is sent to any server.
Our support team is here to assist you around the clock. Get Expert Help, Anytime.