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Hazuu Tools

CSS Validator

Validate your CSS syntax and catch errors with precise line and column numbers.

CSS Input
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About CSS Validator

CSS syntax errors can cause unexpected rendering across browsers — missing semicolons, invalid property values, and malformed selectors silently break styles. Catching these issues early saves hours of debugging in browser dev tools.

Our CSS Validator parses your stylesheet and reports syntax errors with exact line and column numbers. It catches missing semicolons, invalid selectors, malformed property values, and structural issues. All validation runs locally in your browser — your CSS never leaves your machine.

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How to Use

01

Paste Your CSS

Copy your CSS stylesheet and paste it into the editor, or upload a .css file.

02

Validate

Click "Validate" to parse your CSS and check for syntax errors.

03

Fix Errors

Review the error list with line numbers and fix each issue in your source code.

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Frequently Asked Questions

What is a CSS Validator? expand_more
A CSS Validator parses your stylesheet and checks it for syntax errors according to CSS specifications. It catches missing semicolons, invalid property values, malformed selectors, and structural issues, reporting the exact location of each error.
What types of CSS errors does this catch? expand_more
The validator catches missing semicolons, missing colons between properties and values, unclosed braces, malformed selectors, invalid at-rules, and general structural syntax issues in your CSS.
Is my CSS code secure? expand_more
Yes. All validation runs entirely in your browser using the css-tree parser. Your CSS never leaves your machine and is not sent to any external server.
Does this validate against W3C standards? expand_more
The validator checks CSS syntax and structure. For full W3C compliance checking including property value validation against specific CSS levels, use this tool alongside the official W3C CSS Validator.