HTML error checker

Validate HTML code for syntax errors, missing tags, and standards compliance with detailed error reports

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About This Tool

The HTML Error Checker is a comprehensive validation tool that analyzes HTML code to identify syntax errors, missing or mismatched tags, deprecated elements, and compliance issues with web standards. It provides detailed reports with line numbers, error descriptions, and suggestions for fixes. The tool supports both manual code input and file uploads, making it ideal for web developers, designers, and content creators who need to ensure their HTML is error-free and standards-compliant.

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How to Use

Paste your HTML code into the textarea OR drag and drop an HTML file into the upload zone
Select validation options (strict mode, check deprecated tags)
Click 'Validate HTML' to analyze your code
Review the detailed error report with line numbers and suggestions
Fix errors in your code based on the report and re-validate if needed

Frequently Asked Questions

Find Quick Answers

What types of HTML errors does this tool detect?

The tool detects syntax errors, missing closing tags, mismatched tags, deprecated HTML elements, invalid attributes, and non-standard code that may cause rendering issues in browsers.

Does this tool require an internet connection to work?

Yes, the tool requires an internet connection as it runs entirely in your browser using JavaScript. No data is sent to external servers for validation.

Can I validate HTML files larger than 1MB?

Yes, the tool can handle files up to 5MB in size. For optimal performance with very large files, we recommend using the textarea input method.

Does this tool fix HTML errors automatically?

No, this is a validation tool that identifies errors and provides suggestions. You need to manually fix the errors in your code based on the detailed report.

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