Multi-Screen Alignment
Compare visible alignment and relative color across two or more displays using browser guides.
This check opens a focused test surface. You can return with Escape. Review what this browser test can and cannot measure.
Before you start
- Open the page on each display and keep their presets unchanged.
- Use steady room lighting and arrange the windows so guides can cross display edges.
How to run this check
- Open Multi-Screen Alignment on all monitors
- Enable crosshair grid
- Drag window borders to check alignment
- Compare colors across screens
- Record visible offsets and relative color differences before adjusting monitor positions or settings
What this browser test can tell you
Can help you check
- Visual alignment and relative color comparison between screens.
Cannot measure
- This test cannot provide calibrated color matching or physical bezel measurement.
Setup, interpretation, and sources
Recommended setup
- Place the browser pattern across the displays and use comparable display presets.
- View the screens from your normal position under steady room lighting.
How to interpret what you see
- Record visible alignment offsets and which colors or brightness levels differ between screens.
- Exact matching and dimensions require a calibrated colorimeter plus a physical measuring tool.
Sources
Methodology reviewed:
💡 Why This Test?
Multi-monitor alignment can be checked visually by comparing line continuity, relative height, angle, and color appearance across screens.
This page is an alignment aid and saves your own 1-5 observations and notes locally. It does not measure bezel dimensions, luminance, white point, Delta E, or a calibrated match score.
✅ What You'll Check:
- Vertical alignment (top/bottom edges match across screens)
- Horizontal continuity (lines flow smoothly across bezels)
- Relative brightness and warm/cool appearance
- Physical angle alignment (no tilt or rotation)
- Bezel gap compensation settings
📖 How to Use This Test
- Click "Edge Alignment" to test vertical/horizontal line continuity
- Drag the fullscreen window across monitors or press F11 on each screen
- Look at the red vertical line - it should appear continuous across bezels
- Adjust physical monitor height or angle if the visible offset matters to you
- Use "Color Matching" mode to compare brightness and temperature
- Record relative color differences before changing display settings
- Use "Grid Overlay" to check multiple alignment points simultaneously
Tip: Keep room lighting and display presets steady. Exact color matching requires a calibrated colorimeter, and physical bezel measurements require a ruler or caliper.
📖 How to Use
Vertical Alignment
Check if your monitors are aligned at the same height. The vertical line should appear continuous across screen edges.
- • Adjust monitor stands to match heights
- • Check for physical tilt
- • Ensure bezels align properly
Horizontal Continuity
Horizontal lines should flow seamlessly across monitors. Check if lines break or shift at bezel edges.
- • Use grid mode to check multiple lines
- • Adjust angle/rotation of monitors
- • Fine-tune in OS display settings
Color Consistency
Different monitors may display colors differently. Use color matching mode to compare.
- • Match brightness levels first
- • Adjust color temperature (warm/cool)
- • Calibrate using monitor OSD
Bezel Compensation
Some GPUs support bezel compensation to hide gaps between monitors in games/apps.
- • Check NVIDIA Surround or AMD Eyefinity settings
- • Measure bezel width for precise compensation
- • Test with fullscreen games
⚠️ Common Multi-Monitor Issues
Height Mismatch
Monitors at different heights cause eye strain.
Fix: Adjust stand height or use monitor arms. Center of screen should be at eye level.
Color Temperature Difference
One monitor looks warmer/cooler than others.
Next step: Record the relative difference before adjusting one supported display preset at a time.
Different Brightness
Monitors have mismatched brightness levels.
Next step: Compare at steady room lighting; use a calibrated luminance meter for an exact match.
Scaling Mismatch
Different DPI scaling on mixed-resolution monitors.
Fix: Set same scaling on all monitors, or use per-monitor DPI (Windows 10+).
💡 Setup Tips
Physical Placement
- • Place monitors at equal distance from eyes
- • Angle side monitors inward 15-30°
- • Match bezels as closely as possible
- • Use monitor arms for flexibility
OS Configuration
- • Arrange monitors in Display Settings
- • Set primary monitor correctly
- • Match refresh rates if possible
- • Enable GPU-based alignment tools
Calibration
- • Use a calibrated colorimeter for quantitative matching
- • Choose the appropriate measured target for your workflow
- • Warm up monitors for 30 minutes
- • Recheck after material display or lighting changes
🔧 Common Issues & Solutions
🎨 "One monitor looks warmer/cooler than the other" (Color temperature/panel mismatch)
What you observed: One display appears warmer or cooler than another when showing the same browser pattern.
Context: Display presets, operating-system color management, viewing angle, brightness, room lighting, panel age, and hardware differences can all affect the comparison.
Next step: Record the relative difference and current settings before changing one supported preset at a time. Use a calibrated colorimeter for quantitative matching.
📏 "Lines don't align across monitors, window jumps/resizes" (Scaling, resolution, bezel compensation)
What you observed: Lines break across bezels or a window changes apparent size when moved between displays.
Context: Physical height, angle, bezel width, resolution, scaling, and operating-system display arrangement are separate variables.
Next step: Use the line guide for visible adjustment, the operating-system arrangement for cursor movement, and a physical ruler when exact bezel compensation is required.
🎮 "Mouse stutters/judders, video playback choppy on second screen" (Refresh rate conflict)
What you observed: Motion or cursor behavior differs across displays with different settings.
Context: Browser scheduling, operating-system compositing, graphics load, application acceleration, display modes, and variable-refresh features can all affect motion.
Next step: Record each display's configured mode and compare one change at a time. Use the refresh-rate page for browser cadence, not a panel timing certificate.
💡 "Can't match brightness - one monitor too dim/bright" (Backlight, panel age, settings)
What you observed: The same gray pattern appears brighter on one display than another.
Limitation: This page provides relative visual comparison only. It cannot measure luminance in nits or establish an objective target.
Next step: Keep room lighting and display mode steady, record the relative difference, and use a calibrated meter when an exact luminance match is required.
🖥️ "Text too small on 4K, too large on 1080p in dual setup" (PPI mismatch, scaling nightmare)
What you observed: Text or UI changes apparent size when a window moves between displays.
Context: Physical pixel density, per-display scaling, application DPI awareness, browser zoom, and font settings can all contribute.
Next step: Record each display's resolution and scaling, then use operating-system accessibility and per-display settings that keep text comfortable. There is no universally correct combination.