1. Auto-Detection
Viewport dimensions are detected and displayed automatically on page load.
Viewport Size
Output
Note
Tools:
Viewport Size
Viewport Size Checker
Processing...
Viewport Size
Viewport Size is a free browser-based developer utility by ToolPix. All formatting, validation, and encoding tasks run 100% locally in client-side memory via JavaScript and WebAssembly — your source code, tokens, and data are never uploaded or stored on any server.
Quick Steps
2. Resize or Rotate
Resize your browser or rotate your device to see viewport values update live.
3. Copy Results
Click the Copy button to copy all viewport information to your clipboard.
FAQ
What is the difference between layout and visual viewport?
Layout viewport is the full document width, while visual viewport is the visible area that may be smaller due to pinch-zoom on mobile.
Does this update on device rotation?
Yes. The tool listens for both window.resize and orientationchange events to keep values current.
Is any data sent to a server?
No. All values are read from browser APIs locally. Nothing is transmitted.
What is device pixel ratio?
Device pixel ratio (DPR) is the ratio between physical and CSS pixels. A 2x DPR means 1 CSS pixel = 2 physical pixels.
Is this tool free?
Yes, completely free with no usage limits or sign-up required.
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