Free Online Screen Resolution Checker

A screen-info tool reports physical screen resolution, current viewport, device pixel ratio and colour depth from the window.screen and window.matchMedia APIs.

Your data is processed entirely in your browser and never sent to any server.

Instant results 100% private No signup needed

Screen resolution

0 × 0

Viewport size

0 × 0

Device pixel ratio

1

Color depth

0 bits

Orientation

Values update automatically when you resize the window.

How to Use This Tool

  1. Open the page — every display value is shown immediately.
  2. Resize the window to see the viewport values update live.
  3. Drag the window to another monitor to see device-specific values change.
  4. Copy any value with the inline Copy button.

What Is a Screen Resolution Checker?

There are several "resolution" values worth distinguishing. The physical screen resolution is what the panel manufacturer specifies. The OS-reported resolution may differ due to scaling. The browser viewport depends on window size and zoom level. The device pixel ratio is the multiplier between CSS pixels and physical pixels on high-DPI displays — a Retina screen typically reports DPR 2 or higher.

Designers verifying that breakpoints fire correctly use the live viewport readout. QA testers attach the values to bug reports so engineers can reproduce display-specific issues. Front-end developers cross-check their device-pixel-ratio handling on hardware they don't own. This tool reports all the values together and updates live: resize the window or drag it to another monitor and the figures change in real time.

Nothing is sent or stored — it's a read-only view of what your browser already knows about the display.

Frequently Asked Questions

Resolution vs viewport?
Resolution = physical pixels. Viewport = browser window size. Can differ with zoom, taskbar.
What about retina/HiDPI?
Device pixel ratio shows scaling. 2x means 2 physical pixels per CSS pixel.
Why does it matter?
Design responsive sites. Test different sizes. Debug layout issues.

Published by the WeGotEveryTool team. We build and test every tool in-house and update pages when the underlying spec, formula, or recommendation changes.

Reviewed: May 2026. Disclaimer: this tool is provided as-is for general informational use. For decisions with material consequences (medical, legal, financial, security) verify results against a qualified professional source.

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