How does the Viewport Checker check work?

Enter or paste the content you want to check, then click the Check button. The tool analyzes your input and provides a detailed report with findings and suggestions. Everything runs locally: Preset Width and other values are processed on your device, never sent to a server.

Is the Viewport Checker free to use?

Yes, this tool is completely free with no signup required. Everything runs locally: Preset Width and other values are processed on your device, never sent to a server — your data is never uploaded to any server, ensuring complete privacy and security.

What does the Viewport Checker report include?

The report includes a detailed analysis of your input with specific findings, severity levels, and actionable suggestions. All checks run locally in your browser for instant, private results.

Viewport Checker

Real-time viewport size checker. Resize your browser to see viewport dimensions at different breakpoints. Essential for frontend developers.

0 × 0

Viewport Size (Live)

Preset Width px

What is Viewport Checker?

Viewport Checker is a free online tool that runs entirely in your browser. No download or signup needed — enter Preset Width and other values to get results instantly. All data is processed locally.

Use Cases

Test responsive layouts at common device breakpoints
Verify CSS media queries trigger correctly
Check mobile-first design at 375px/768px/1024px
Debug layout overflow issues on different screen sizes

Key Features

Completely Free: No registration, no limits
Privacy Safe: Data never leaves your browser
Cross-Platform: Any modern browser
Zero Dependencies: Open and use

Viewport Checker

What is Viewport Checker?

Use Cases

Key Features

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