Client-side engine
Screen resolution checker
Read screen, viewport and DPR live. Free. No account.
- Screen width
- —
- Screen height
- —
- Available screen
- —
- Viewport
- —
- Visual viewport
- —
- Device pixel ratio
- —
- Color depth
- —
Values come from this browser’s CSS pixels and may differ from the OS display panel.
- screen and window APIs
- Values come from the browser, not the OS control panel
Workflow
How to use Screen resolution checker
Three steps. This runs in your browser. What you type is not uploaded by this tool.
- 01
Open the page.
Open the page.
- 02
Read screen and viewport sizes.
Read screen and viewport sizes.
- 03
Resize the window to watch viewport change.
Resize the window to watch viewport change.
Direct answers
Essential questions answered
Short answers for search and answer engines. Same facts as the FAQ.
How do I check screen resolution in a browser?
Open the page and read screen and viewport sizes. Resize to watch viewport change.
Is this data sent away?
No.
Why does it differ from my OS?
Browsers report CSS pixels and may apply scaling.
Practical applications
Good for everyday workflows
Confirm CSS pixel size
Live screen resolution, browser viewport, and device pixel ratio.
Debug responsive breakpoints
Live screen resolution, browser viewport, and device pixel ratio.
Check device pixel ratio
Live screen resolution, browser viewport, and device pixel ratio.
Got questions?
Frequently asked questions
Is the resolution checker free?
Yes on ToolStudio.
Does it show physical pixels?
It shows CSS pixels and DPR, not a calibrated hardware meter.
Is anything uploaded?
No.
More utilities tools
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Free browser utilities on ToolStudio. No account. Most tools keep files on this device.