Lint HTML for missing DOCTYPE, unclosed tags, and unexpected closing tags. Paste your HTML and get instant feedback. Everything runs locally in your browser — nothing is uploaded.
Removes unnecessary whitespace, comments, and optional closing tags from HTML code to reduce file size without altering rendered output. Everything runs locally in your browser — nothing is uploaded.
Convert Pug/Jade template syntax to HTML. Parse indentation-based Pug into standard HTML tags. Everything runs locally in your browser — nothing is uploaded.
Lint Dockerfiles against 20+ valid instructions (FROM, RUN, CMD, COPY, ENTRYPOINT, HEALTHCHECK, SHELL). Detects unknown instructions and missing FROM declaration.
Strip all HTML tags from content and decode HTML entities. Convert any HTML document back to clean plain text. Everything runs locally in your browser — nothing is uploaded.
Convert plain text to HTML paragraphs with proper paragraph and line break tags. Handles double line breaks as paragraph separators. Everything runs locally in your browser — nothing is uploaded.
HTML Linter lets you lint HTML for missing DOCTYPE, unclosed tags, and unexpected closing tags. Paste your HTML and get instant feedback. Everything runs locally in your browser — nothing is uploaded.. It works on any device with a modern web browser.
Lint HTML for missing DOCTYPE, unclosed tags, and unexpected closing tags. Paste your HTML and get instant feedback. Everything runs locally in your browser — nothing is uploaded. It runs entirely in your browser — no software installation or data uploads required.
Paste or type your content directly into the provided text area.
Yes. After the initial page load, HTML Linter runs entirely on your device with no internet connection needed. All processing is done locally.
Missing DOCTYPE declaration, unclosed tags, unexpected closing tags, duplicate attributes, deprecated elements, and accessibility issues.
Yes. The linter checks HTML5 DOCTYPE, valid element nesting, required attributes, and semantic structure compliance.
No. The linter identifies issues with line numbers and descriptions. You must manually edit the HTML to fix reported problems.
Basic accessibility checks include missing alt attributes on images, missing form labels, and heading hierarchy issues.
No. All linting happens locally in your browser. No HTML data is transmitted.
Validator
Validate code syntax across multiple languages including JSON, XML, and JavaScript. Everything runs locally in your browser — nothing is uploaded.
HTML Formatter
Indents and structures HTML markup with proper nesting, attribute alignment, and readable indentation for templates and email designs.