🖥️ Screen Tearing Test — Motion Bars, Frame Timing & Stutter
Free browser toolDevice TestsNo external libraries

Free Screen Tearing Test With Moving Patterns, Frame Timing, Jitter, and Fullscreen

Run high-contrast moving patterns while monitoring browser frame timing to visually inspect tearing-like discontinuities, judder, or stutter.

Motion pattern inspection

900 px/s

48 px

Estimated FPS—
Median frame—
P95 frame—
Jank proxy0
A browser cannot reliably detect a physical tear line. Modern compositors may synchronize presentation, so absence of visible tearing here does not prove the entire system is tear-free.

12 practical capabilities

✓ Moving motion bars
✓ Adjustable speed
✓ Direction control
✓ Pattern density
✓ Fullscreen inspection
✓ Estimated FPS
✓ Median frame time
✓ P95 frame time
✓ Jank proxy
✓ Pause/resume
✓ Preset speeds
✓ Saved inspection notes

How to get a trustworthy result

Quick checklist

Use realistic inputs or a stable test setup.
Run more than one sample when timing or hardware is involved.
Read the scope note before interpreting the result.
Save a report if you want to compare runs later.

0 of 4 complete

Microlearning

Run high-contrast moving patterns while monitoring browser frame timing to visually inspect tearing-like discontinuities, judder, or stutter.

Results are most useful when you understand what the browser can and cannot measure. Mathematical calculators can follow exact formulas; device tests may be influenced by operating-system scheduling, browser behavior, display synchronization, audio routing, and hardware firmware.

Quick quiz: Which approach usually improves confidence?


Local history

Recent results stay in this browser only.

Frequently asked questions

What does this screen tearing test do?

Run high-contrast moving patterns while monitoring browser frame timing to visually inspect tearing-like discontinuities, judder, or stutter.

Does it work entirely in the browser?

Yes. The interactive calculations or tests run locally in the page using standard browser capabilities; no external library is required.

Are the results exact?

Mathematical outputs follow the displayed formulas, while device-test measurements depend on browser event timing, operating-system behavior, hardware, and rendering conditions.

Can I save or share a result?

Yes. Use the copy and download controls for a plain-text report, and use the local history panel for recent runs stored in this browser.

Does this page replace professional measurement equipment?

No. It is a practical browser-based calculator or screening tool. Hardware diagnostics and calibrated measurements may require dedicated equipment or vendor software.

Scope and interpretation

This page is designed for practical browser-based calculation or screening. Use the displayed formulas and scope notes when interpreting results. Device-related measurements can vary with browser scheduling, operating-system behavior, hardware, drivers, display synchronization, and audio routing.

For browser API background, see MDN Web Docs.