Screen testing tools
25+ free online tools for testing every aspect of your display — pixel defects, color accuracy, motion, refresh rate, and more. All tools run entirely in your browser, no download required.
Pixel & Defect Tests
Dead Pixel Test
Solid-color fullscreen frame-by-frame scan. Detects bright pixels, dark pixels, and stuck pixels in seconds.
Backlight Bleed Test
Pure black fullscreen in a dark room to detect LCD backlight leakage and IPS glow.
Burn-in Test
OLED and AMOLED burn-in detection. Solid color, checkerboard, and gradient scan modes.
Color & Greyscale
Greyscale Test
256-level greyscale transition check. Reveals shadow crushing, highlight clipping, and color banding.
Color Accuracy Test
Standard color patch comparison for bias diagnosis. Verify your screen reproduces colors faithfully.
Color Gamut Test
sRGB and DCI-P3 hidden pattern gamut test. Verify your panel's wide gamut claims instantly.
Contrast Test
Black/white/gray pattern test for contrast ratio evaluation. Verify your panel's dynamic range.
Uniformity Test
Multi-zone brightness uniformity check. Detect hotspots, dark corners, and color shifts across your panel.
Gradient Test
Gray gradient, RGB color gradient, radial gradient, and hue wheel. Detect color depth and banding issues.
HDR Test
Peak highlight and shadow detail patterns for verifying HDR tone mapping, peak brightness, and EOTF tracking on HDR-capable displays.
Black Level Test
Near-black gradient steps (0–10% stimulus) that reveal shadow crush, black-level calibration, and true black performance on OLED and LCD.
Brightness Test
Fullscreen white and 10% window patterns for measuring peak brightness, ABL behavior, and sustained vs. burst luminance on any display.
RGB Test
Primary color fields and gradient ramps for verifying red, green, and blue sub-pixel health, channel balance, and color mixing accuracy.
sRGB Test
sRGB color space verification with primary, secondary, and grayscale targets — confirms sRGB mode accuracy and gamut clamping behavior.
DCI-P3 Test
DCI-P3 wide gamut verification with primary, secondary, and skin tone targets — confirms P3 coverage and tone-mapping on wide-gamut displays.
Color Banding Test
Smooth gradient ramps designed to reveal color banding, posterization, and 8-bit vs 10-bit color depth limitations on any display.
Color Depth Test
Bit-depth specific patterns that distinguish 6-bit, 8-bit, 8-bit+FRC, and true 10-bit displays — confirms your panel's true color precision.
Gamma Calibration
Gamma target patterns (1.8, 2.0, 2.2, 2.4, BT.1886) for calibrating your display's luminance curve to the correct standard for your content type.
Motion & Refresh
Refresh Rate Test
Real-time frame rate detection. Verify your panel runs at its rated 60Hz, 120Hz, 144Hz, or 240Hz.
Ghosting Test
Moving block test for response time and grey-to-grey transition speed. Catch slow pixel response.
Screen Tearing Test
Moving vertical bars that reveal screen tearing, VSync state, and G-Sync/FreeSync behavior at any refresh rate.
Flicker Test
Camera-aided PWM flicker detection and motion test — measures flicker frequency, identifies PWM dimming, and reveals invisible eye-strain sources.
Display-Specific Tests
Resolution Checker
One-click detection of physical resolution, logical resolution, DPR, color depth, and refresh rate.
OLED Screen Test
Comprehensive OLED-specific test: burn-in, PWM flicker, ABL, black crush, and color fidelity.
Blooming Test
Small bright objects on black backgrounds that reveal local dimming halo, blooming, and black-level elevation on FALD and Mini LED displays.
Solid color screens
Calibration & calculators
Monitor Color Calibration
8-step calibration wizard with progress tracking and linked test tools.
Screen Size Calculator
Input diagonal and resolution to calculate PPI, physical dimensions, and pixel density.
Aspect Ratio Calculator
Auto-calculate aspect ratio from resolution or reverse-calculate dimensions from ratio.
Monitor Color Test
12 standard colors + custom hex input for color bias and saturation testing.
Device testing guides
Laptop Screen Test
8-step standard screen verification · Panel type comparison · Return standards · Parameter glossary
Monitor Screen Test
IPS/VA/OLED panel testing · PPI verification · G-Sync/FreeSync validation
OLED Screen Test
Burn-in · PWM · ABL · Black crush — comprehensive OLED-specific issue coverage
LCD Screen Test
IPS bleed · VA ghosting · Mini LED blooming — complete LCD panel evaluation
Mobile Screen Test
OLED burn-in · Touch dead zones · PWM flicker — essential for used phone inspection
TV Screen Test
Mini LED blooming · Backlight bleed · OLED burn-in · MEMC · HDR evaluation