Screen Test Online for Resolution, Refresh Rate, and Browser FPS

Use this browser-based screen test to inspect the display path your browser actually sees. It reports screen resolution, viewport size, color depth, estimated refresh behavior, and an optional PPI calculation for monitor setup checks.

Display Snapshot

These values come from browser APIs. Screen and viewport sizes are browser-reported CSS pixels, while the estimated display pixels value is derived from CSS size multiplied by device pixel ratio.

Browser FPS Check

This lightweight sampler uses requestAnimationFrame for three seconds to estimate how smoothly your browser is presenting frames on the current display path.

Average FPS

Estimated refresh rate

Average frame time

Screen Size and PPI Calculator

Resolution width in pixels

Resolution height in pixels

Monitor diagonal size in inches

For the most accurate PPI, enter the monitor's actual pixel resolution from the display specs. The resolution fields are prefilled with a browser-based estimate so you can adjust them if needed.

Estimated PPI

Approx. width

Approx. height

What This Online Screen Test Checks

This page is built for search intent like "screen test", "screen checker", and "screen diagnostics". The tool runs directly in the browser so users can verify the hardware path before moving on to deeper troubleshooting.

Display data from the live browser session

The page reads your current screen resolution, viewport size, device pixel ratio, orientation, and color depth so you can confirm how the active browser session maps to the display.

Quick browser FPS and refresh estimate

The FPS sampler gives you a practical estimate of how smoothly frames are presenting on the current screen path, which is useful when checking monitor setup, browser smoothness, or remote desktop behavior.

Built-in PPI calculator for monitor specs

If you know the panel diagonal in inches, you can estimate pixel density and screen dimensions without leaving the page.

How To Use It

Review the display snapshot first

Confirm the resolution, viewport, pixel ratio, and orientation values match the monitor configuration you expect.

Run the browser FPS check

Use the FPS tool to estimate whether the browser is presenting frames in line with your expected refresh rate.

Use the PPI calculator if needed

Enter the panel size in inches to estimate pixel density when comparing screens or validating a monitor spec sheet.

Why It Matters

Useful for monitor setup and troubleshooting

This kind of screen test helps when a monitor looks blurry, scaled incorrectly, or unexpectedly capped to a lower refresh path.

Grounded in what the browser can actually inspect

Browsers can report resolution, viewport, pixel ratio, and color depth, but they cannot directly read the physical screen size. That is why the PPI field is a calculator rather than an automatic detector.

Good for sanity checks before deeper graphics testing

If the display path is wrong, GPU benchmarks and animation tests can mislead you. This page gives you a fast preflight check.

Frequently Asked Questions

Can an online screen test detect my exact monitor refresh rate?

Not perfectly. Browsers can estimate refresh behavior by observing frame presentation timing, but the result is still an approximation rather than a direct hardware query.

Why is viewport size different from screen resolution?

Viewport size reflects the available browser area, while screen resolution describes the full display. Browser chrome, zoom, scaling, and side panels can all change the viewport.

Can this page detect the physical size of my monitor?

No. Browsers do not expose the physical diagonal of the screen, so the page asks you to enter that value if you want a PPI estimate.

Is this enough to test color accuracy or dead pixels?

No. This page focuses on browser-visible display metrics and smoothness. Color calibration and dead-pixel checks need dedicated full-screen visual test patterns.

More Browser Hardware Tests

These tools cover related search intents without duplicating the same copy. Each page focuses on a specific device path so users can isolate the problem faster.