PIXEL GRID OVERLAY
HOW TO USE
1) Set CELL size. Start at 8px; use 1–4px for sharpness checks.
2) Adjust LINE, colour and opacity until the grid is clear.
3) Press START for fullscreen; exit with ESC or tap/click.
4) Change monitor sharpness, OS scaling or browser zoom and compare the result.
WHAT TO LOOK FOR
Soft lines: browser zoom, fractional scaling or display processing.
Moiré shimmer: panel scaling or high-frequency interference.
Crooked centre: overscan, aspect mismatch or GPU scaling.
DEVICE GUIDANCE
Laptop/monitor: test at browser zoom 100% first.
Phone/tablet: small cells may shimmer because of pixel density.
TV: disable overscan and sharpening for cleanest results.
WHAT THIS TOOL IS FOR
Pixel Grid Overlay shows a fullscreen adjustable grid for display checks.
Use it to inspect scaling, sharpness, alignment, overscan and geometry.
The clean fullscreen canvas makes screen processing easier to see.
WHO USES IT?
Monitor buyers, display testers, designers, developers and repair checks.
It helps compare screen settings before and after changes.
It also works as a quick alignment grid for projectors and TVs.
COMMON SEARCHES
pixel grid overlay • screen scaling test • sharpness checker
subpixel test pattern • moiré display test • monitor alignment grid
fullscreen pixel grid • screen geometry test • overscan checker
FAQ
Is it pixel accurate? The canvas uses devicePixelRatio for crisp drawing.
Why does it blur? OS scaling, browser zoom or panel processing can soften it.
What is subpixel? RGB-style stripes that reveal fringing and stripe layout.
How do I exit? ESC or tap/click anywhere.
BEST STARTING SETTINGS
CELL 8px: general scaling and alignment checks.
CELL 1–4px: sharpness, moiré and subpixel checks.
Opacity 15–25%: readable grid without overpowering the screen.
MINI BLOG: PIXEL GRIDS
- Native resolution usually gives the sharpest grid.
- Fractional scaling can soften thin lines.
- TV overscan can crop or shift the centre.
- Subpixel stripes help reveal colour fringing.
RELATED TOOLS
Advanced Display Tools P790 — parent hub for Pages 790–799.
P797 Eye Focus Pattern — previous sibling.
P799 Experimental Display Tool — next sibling.
HUB + SIBLING LINKS
Frame Rate Checker • Refresh Rate Test
NAVIGATION
Footer links connect HOME, INDEX, PREVIOUS and NEXT.
The internal pager is always at the bottom of the main frame.
Internal pages keep help text large, readable and no-scroll safe.
SEO SUMMARY
Best folder: /pixel-grid-overlay/
Canonical URL matches the recommended folder exactly.
Page 1 stays tool-focused; support, search intent and related links follow.
KEYWORDS
pixel grid overlay • screen scaling test • sharpness checker
subpixel test pattern • moiré display test • monitor alignment grid
fullscreen pixel grid • screen geometry test • overscan checker
PAGE STRUCTURE
Page 1: working pixel grid overlay, main controls and live preview.
Pages 2–6: large readable help and SEO panels with no tiny boxes.
All internal pages use the same bottom pager style.