Compare the screen row with the viewport row: one is your panel, the other is your window.
Short answer
screen.width × height is the display panel In practice, open the linked tool below and compare your live values with the explanations that follow.
How it works
How to Check Your Screen Resolution comes down to reading documented browser signals and interpreting them honestly — including when the browser withholds them.
- screen.width × height is the display panel
- innerWidth × innerHeight is the live window
- OS scaling and zoom change the CSS numbers
At a glance
| Signal | What you learn |
|---|---|
| Browser report | Live values for this device right now |
| Withheld fields | Privacy protections, not hardware faults |
| Best next step | Use the related tool to verify your own setup |
Practical steps
- Open the related tool and note the highlighted rows.
- Compare them with the points above.
- If something looks off, check zoom, extensions and private mode, then retest.
Try it live: open the related checker and see your own values.
FAQ
Which number do I give support?
Give both: screen resolution and current viewport, plus your zoom level. That trio explains nearly every layout question.
Related reading
Bottom line: OS scaling and zoom change the CSS numbers When in doubt, trust the live tool over memory — browsers change, and support varies by browser.