Ensure your website's code is error-free. Our online HTML validator checks your markup against W3C standards to find issues and improve cross-browser compatibility. 

Your Website Looks Fine in Chrome. But Is It Broken in Firefox?

Think of the HTML code for your website as the grammar of a sentence. A small mistake—like a missing closing tag or a typo in an attribute—might be overlooked by one person (a web browser like Chrome), who is smart enough to guess what you meant.

But another person (a browser like Firefox, Safari, or a screen reader for visually impaired users) might get completely confused by that same mistake, causing your beautifully designed page to look broken, misaligned, or even be unusable. This is why writing valid, error-free HTML is so important. An HTML validator is the proofreader that checks your code's "grammar" for you.

Why You Should Validate Your HTML

Validating your code is a crucial step for any professional web developer. It helps:

• Ensure Cross-Browser Compatibility: Valid code is much more likely to render consistently and correctly across all web browsers.

• Improve Accessibility: Screen readers and other assistive technologies rely on clean, valid code to interpret your content for users with disabilities.

• Make Debugging Easier: It’s often the first step in troubleshooting why a page is behaving strangely. A validator can pinpoint the exact line where an error exists.

• Future-Proof Your Site: Code that adheres to web standards is more likely to work correctly with future versions of browsers.

How to Check Your Code for Errors

You can find potential problems in your markup in seconds:

1. Open the HTML Validator: Go to the FreeXTool HTML Validator.

2. Provide Your Code: You can either paste your HTML code directly into the text box, upload an .html file, or enter a URL to check a live page.

3. See the Results: The validator will check your code against official W3C standards and provide a list of any errors or warnings it finds, often with line numbers and suggestions for how to fix them.

Pro-Tip: Start with the First Error

A single error at the beginning of a document (like an unclosed <div>) can sometimes cause a cascade of what looks like many other errors. Always start by fixing the very first error in the validator's report, and then re-validate. You might find that fixing one problem solves ten!

Keep your code clean and functional with these developer tools:

• HTML Viewer

• HTML Formatter

• CSS Beautifier