Screen Tearing Test — Check V-Sync & G-Sync Online
Visually identify frame presentation tearing cuts and verify operating system compositor synchronization.
The Physics of Screen Tearing
Monitors scan out pixels row-by-row from top to bottom. If a frame buffer swap occurs during the scanout process without synchronization, a horizontal shear boundary becomes visible across high-contrast vertical lines.
Frequently Asked Questions
What causes screen tearing?
Screen tearing happens when the graphics card updates the frame buffer in the middle of the monitor scanning out a frame to the panel, resulting in the top half showing one frame and the bottom half showing another.
How do V-Sync, G-Sync, and FreeSync prevent tearing?
V-Sync locks GPU frame delivery strictly to monitor refresh scanout cycles. Variable Refresh Rate (G-Sync/FreeSync) allows the monitor to dynamically adjust its physical refresh rate to match the exact GPU frame rate.
Why might tearing be absent in modern web browsers?
Modern operating systems (Windows Desktop Window Manager, macOS Quartz Compositor, Linux Wayland) run triple-buffered composition by default, automatically preventing tearing in windowed applications unless explicit exclusive fullscreen flags are engaged.
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