HTML Link & Heading Extractor
About CSS Media Query Tester
The CSS Media Query Tester & Responsive Breakpoint Inspector simulates screen widths, device aspect ratios, orientation (portrait/landscape), color schemes (`prefers-color-scheme: dark`), and resolution DPI to test CSS `@media` queries in real time.
How to Use CSS Media Query Tester
Step 1
Enter your CSS `@media` rule into the editor.
Step 2
Drag the responsive viewport slider or select a device preset.
Step 3
Inspect whether the media query evaluates to TRUE or FALSE in real time.
Step 4
Click "Copy Media Query".
Practical Use Cases for CSS Media Query Tester
Testing Responsive Breakpoints for Mobile, Tablet & Desktop
Verify `@media (min-width: 768px)` and `@media (max-width: 1024px)` rules against popular device dimensions (iPhone, iPad, MacBook, 4K monitors).
Auditing Dark Mode & Accessibility Media Features
Test `@media (prefers-color-scheme: dark)` and `@media (prefers-reduced-motion: reduce)` media queries.
Input & Output Examples
Testing Media Query Evaluation
Query: `@media (min-width: 768px) and (max-width: 1024px)` | Viewport: `820px` (iPad Air)
Status: ✅ MATCHED | Viewport: `820px x 1180px` | Orientation: Portrait
Key Features & Performance
- ✓Interactive viewport slider with presets for 20+ mobile, tablet, and desktop devices.
- ✓Supports modern CSS Range Media Queries (e.g. `@media (768px <= width <= 1200px)`).
- ✓Simulates `prefers-color-scheme`, `prefers-reduced-motion`, `orientation`, and `hover: hover`.
- ✓100% Client-Side memory execution.
- ✓1-Click Copy media query boilerplate.
Key Terminology & Definitions
CSS Media Feature
A condition testing a specific characteristic of the user's output device, such as `width`, `height`, `orientation`, or `prefers-color-scheme`.
Range Syntax (Media Queries Level 4)
Modern syntax allowing mathematical inequality comparisons like `@media (width >= 768px)` instead of `min-width`.