JSONToTable
Loading CSS Validator...
Please wait a moment

How to Validate CSS - Step by Step Guide

Step 1

Input Your CSS Code

Start by entering your CSS code that needs validation for syntax errors and formatting issues.

•
Paste CSS: Copy your CSS code and paste it into the validator
•
Upload file: Select a .css file from your computer
•
Try sample: Click "Sample" to test with example CSS
Step 2

Automatic Validation & Error Detection

The validator instantly checks your CSS for syntax errors, missing semicolons, bracket mismatches, and invalid properties.

•
Syntax checking: Detects CSS syntax errors instantly
•
Error highlighting: Shows exact location of errors with line numbers
•
Smart suggestions: Provides helpful hints to fix errors
Step 3

Review Results & Fix Errors

Review the validation results and fix any errors. The validator provides detailed error messages with suggestions for best practices.

•
Error details: Clear explanations of what went wrong
•
Quick fixes: Suggestions to correct common mistakes
•
Valid CSS: Confirmation when your CSS is error-free

Frequently Asked Questions

What does a CSS validator check?

A CSS validator checks for syntax errors, missing semicolons, bracket mismatches, invalid property names, incorrect values, and other formatting issues that could prevent your CSS from working correctly.

Why is CSS validation important?

Valid CSS ensures your styles work consistently across all browsers, prevents rendering issues, improves maintainability, and helps catch errors early in development before they cause problems in production.

Can the validator fix CSS errors automatically?

The validator identifies errors and provides suggestions for fixes, but you'll need to make the corrections manually. This helps you learn from mistakes and understand proper CSS syntax.

Does it support CSS3 and modern properties?

Yes! Our validator supports CSS3, flexbox, grid, animations, transforms, and all modern CSS properties. It stays up-to-date with the latest CSS specifications.

Is this CSS validator free?

Yes, completely free with no registration required and unlimited validation for all your CSS files.

Related Tools

CSS Minifier

Minify and compress CSS code

CSS Beautifier

Beautify and format CSS code

CSS Formatter

Format and organize CSS code

CSS Compressor

Compress and minify CSS code

CSS Autoprefixer

Automatically add vendor prefixes for cross-browser compatibility

CSS Flexbox Generator

Visual flexbox layout builder with live preview and code generation