Overscan Test
A crisp 1-pixel grid that should touch every edge of the display, with circles in the center and corners. Use it when a laptop on a TV or external monitor crops or stretches the image — adjust picture size, GPU scaling, or aspect ratio until the full grid and all corner circles are visible.
What you can use it for
- Fix TV overscan when mirroring a laptop
- Verify GPU scaling on ultrawide monitors
- Align a projector image to the screen edges
- Check if fullscreen apps are truly edge-to-edge
How it works
- 1. Customize. Open the Customize panel to set text, colors, theme, and animation speed to your liking.
- 2. Go fullscreen. Click Fullscreen for an immersive, distraction-free display on any screen.
- 3. Done. No login, no install, nothing to download — it runs instantly in your browser and your settings are remembered.
Frequently asked questions
What is overscan?+
Overscan crops a few pixels off each edge of the image — common on TVs. Underscan leaves a border. This grid shows exactly how much of the signal is visible.
How do I fix cropping?+
On TVs, set Picture Size to 'Just Scan' or 'Screen Fit'. On GPUs, set scaling to 'No scaling' or adjust the aspect ratio in AMD/NVIDIA/Intel control panels.
More screen tests
Dead Pixel Test
Cycle full-screen colors to find dead and stuck pixels fast.
Screen Uniformity Test
Check brightness and color evenness across the whole panel.
Ghosting Test
A fast-moving object to spot motion blur and ghosting trails.
Backlight Bleed Test
Pure black screen with corner markers to spot edge light leak.
Color Banding Test
Smooth gradients to reveal color banding and bit-depth limits.
Contrast Test
Shaded squares to calibrate black levels and white clipping.
Resolution Test
Live readout of resolution, viewport, DPI scaling, and aspect ratio.
Text Sharpness Test
Tiny text samples to judge subpixel rendering and clarity.