Click to enter fullscreen test
True hardware center — browser chrome must be hidden
Monitor crosshair test
Verify pixel-perfect center alignment on any LCD, OLED, or TV panel. Use a 1px precision dot, geometry square and circle, alignment cross, or white/black contrast field — all rendered with pure CSS pixels, not images.
Test modes
← → switch mode · pure CSS pixels, not images
Mark color
Red on black is best for dead sub-pixels
Shortcuts
Fullscreen required for true center
- F Enter / exit fullscreen
- ← → Switch test mode
- C Toggle contrast background
- Esc Exit fullscreen
Use 100% display scaling and disable overscan in your monitor OSD for the most accurate center read.
What to look for
Look closely at the center. Is the dot perfectly square? If it looks rectangular or is missing, you may have a stuck or dead sub-pixel.
Designing a gaming crosshair? See gaming tools (generator coming soon)Why use display tests?
Dead & stuck pixel check
A 1×1 red dot on a black field makes failed sub-pixels obvious. Increase dot size slightly if your panel uses sub-pixel rendering.
Overscan & aspect stretch
The centered circle and square reveal cropping or non-uniform scaling. If one edge has a wider gap, adjust overscan or aspect ratio in the display OSD.
Multi-monitor alignment
Span fullscreen on each display and confirm the cross intersects the same physical center — misaligned bezels or Windows scaling show up immediately.
Central backlight & IPS glow
Toggle pure white and black in contrast mode to inspect bloom, IPS glow, or a bright patch at the panel center.
How to use the crosshair test
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Step 1
Choose a test mode: precision dot, geometry, alignment cross, or contrast/bloom.
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Step 2
Press Start and enter fullscreen — the reticle must sit on the true hardware center with browser chrome hidden.
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Step 3
Read the on-screen checklist: look for dead sub-pixels, overscan crop, shifted center, or central backlight glow.
Monitor crosshair test FAQs
How is this different from a gaming crosshair generator?
This tool validates your monitor hardware — centering, pixels, overscan, and backlight — not in-game aim reticles. For Valorant or CS2 crosshair codes, use the gaming crosshair generator on our Gaming tools hub (coming soon).
Why must I use fullscreen?
If the browser address bar or taskbar is visible, the crosshair is centered in the viewport, not on the physical monitor. Fullscreen maps the reticle to true hardware center.
How is this different from the uniformity test?
Uniformity focuses on grey-field tint and backlight bleed across the panel. This test puts a precision reticle first for alignment, geometry, and sub-pixel checks on solid fields.
Which mark color should I use?
Red on black is best for dead-pixel hunts. White or green on black also work. Use contrast mode with a cross on pure white and black to judge central glow.
