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1. validator.w3.orgThe W3C Markup Validation Service

   validator.w3.org

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   This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, MobileOK content, or to find broken links, there are other validators and tools available.

   • Docs

     Documentation for the W3C Markup Validator. Here you will...

   • About

     About this service. The Markup Validator is a free service...

   • non-DTD-based Validator

     Chętnie wyświetlilibyśmy opis, ale witryna, którą oglądasz,...

   • Help FAQ

     About the Markup Validator Help me! I clicked on an icon and...

   • News

     The Link Checker now sends Accept, and Accept-Language...

   • MobileOK Content

     The Mobile Checker is a tool for Web developers who want to...

   • W3C RDF Validation Service

     Check and Visualize your RDF documents. olde servlet. Enter...

2. appdevtools.com › html-validatorHTML Validator Online - AppDevTools

   appdevtools.com › html-validator

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   HTML Validator is a free online developer tool to validate HTML code against the W3C standards as known as HTML linter instantly. Supports partial HTML code validation. You can either browse an HTML file, fetch HTML code from a URL, or paste HTML code manually, and then click the validate button.

3. tiiny.host › html-validatorHTML Validator: Instantly Validate HTML Code - tiiny.host

   tiiny.host › html-validator

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   To check your HTML code's validity, simply paste it into our online validator. The tool will analyze your code for errors and compliance with web standards, offering actionable insights and feedback for improvement.

4. www.freeformatter.com › html-validatorFree Online HTML Validator - FreeFormatter.com

   www.freeformatter.com › html-validator

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   Validates HTML files for compliance against the W3C standards and performs linting to assess code quality against best practices. Find missing or unbalanced HTML tags in your documents, stray characters, duplicate IDs, missing or invalid attributes and other recommendations.

5. www.lambdatest.com › free-online-tools › html-validatorFree Online HTML Validator - LambdaTest

   www.lambdatest.com › free-online-tools › html-validator

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   The HTML Validator checks the code for correct syntax, proper use of tags and attributes, and compliance with the HTML specification. It identifies and reports any errors or warnings that it finds, such as missing tags, incorrect attribute values, and non-compliant code.

6. www.view-page-source.comView Page Source | See and download code from any website

   www.view-page-source.com

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   Enter a website's URL, hit "View Source", and we’ll serve up the website's source code in a neatly formatted, accessible manner. Mobile users rejoice – viewing source code has never been easier, regardless of your device.

7. tiiny.host › test-htmlTest Your HTML Code: Paste & Preview Code Instantly

   tiiny.host › test-html

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   Test HTML by Tiiny Host is a simple tool for ensuring your web pages are error-free and fully compliant with industry standards. Our powerful tool scans your HTML code, identifies any errors or warnings, and provides clear and actionable feedback to help you improve your code's performance.