Screen Tester – Online Screen & Monitor Test

Fill the screen with solid colors to easily spot stuck or dead pixels on your monitor.

Examine primary RGB color fields to identify isolated frozen or stuck subpixels.

Examine dark screens to locate hot or bright subpixels permanently stuck open.

This tool displays rapidly changing color patterns in a localized area. It may help exercise temporarily stuck liquid crystal sub-pixels, but cannot repair physically damaged or permanently dead pixels. Screen Tester does not guarantee recovery.

Pinpoint dead pixel coordinates and evaluate ISO 9241-307 warranty eligibility.

Inspect OLED and LCD displays for persistent shadow outlines, static HUD retention, and panel burn-in.

Calculate OLED panel degradation probability and static HUD hazard hotspots.

Inspect pixel inversion artifacts, voltage balancing, and VCOM flicker across LCD and OLED panels.

Detect Frame Rate Control (FRC) temporal dithering and high-frequency pixel shimmer that causes eye strain.

Assess color rendering and saturation using primary and secondary color patterns.

Fill your screen with pure primary, secondary, black, and white fields to inspect overall panel cleanliness.

Inspect browser-reported color-gamut capability and visually compare sRGB vs Display-P3 patterns without claiming physical coverage measurement.

Visually inspect skin tones, neutral grays, and color balance using 24 reference patches. Objective color accuracy and ΔE calibration require a hardware colorimeter.

Visual reference comparing D65 standard daylight against 5000K, 7500K, and 9300K white points with tint compensation.

Assess color vibrancy and detect banding in high-saturation gradients.

Detect 8-bit vs 10-bit color quantization, gradation steps, and dithering banding.

Evaluate multi-stop linear and radial gradient smoothness, tonal continuity, and fine ramp transitions.

Simulate 8 types of color vision deficiency with real-time SVG filters and side-by-side comparison.

Calibrate dynamic range, peak white clipping, and highlight contrast separation.

Calibrate display brightness floor and prevent dark shadow detail crushing.

Tune your monitor's black levels to ensure dark details aren't crushed.

Evaluate subtle dark-tone separation, black crush, and near-black gradation above true black.

Tune your monitor's contrast to ensure bright details aren't clipped.

Test monitor ability to render neutral grays without color tinting.

Visually evaluate your monitor's gamma tracking (target 2.2 for sRGB).

Benchmark Auto-Brightness Limiter dimming and sustained peak luminance across 1% to 100% window sizes.

Audit OS HDR compositing, 10-bit buffer depth, BT.2020 / DCI-P3 wide gamut, Canvas P3, and HDR10 video playback codecs.

Controlled optical visual test for specular highlight clipping point, tone curve rolloff, 10% peak white window, and shadow detail.

Identify hard-clipping thresholds and tone-mapping roll-off across 100 to 4,000 nits highlight patches.

Detect OS dark mode preference, test CSS color-scheme support, and preview UI in both themes.

Identify Dirty Screen Effect (DSE), vignetting, and uneven backlight distribution.

Detect IPS glow, clouding, and light leakage from the bezel in a dark room environment.

Test mini-LED local dimming zones for haloing and blooming artifacts around high-contrast bright objects.

Evaluate IPS, VA, OLED, and TN panel color fidelity and contrast stability when viewed from wide angles.

Inspect full-screen high-frequency temporal optical flicker and display refresh synchronization.

Detect stroboscopic LED pulse-width modulation flicker and evaluate visual fatigue thresholds.

Diagnose variable refresh rate brightness fluctuations, LFC frame jumps, and OLED gamma shifts.

Test LCD pixel response time, trailing ghost artifacts, and overdrive overshoot coronas.

Test moving picture response time (MPRT), sample-and-hold blur persistence, and eye-pursuit clarity.

Verify that your monitor and browser are actually running at their maximum refresh rate.

Benchmark pixel transition speeds and identify monitor overdrive inverse coronas.

Visualize display pipeline processing delay and click-to-photon screen latency.

Visually inspect variable refresh frame pacing, tearing, and judder under dynamic animation workloads.

Observe moving bar patterns for horizontal tear lines and frame-pacing irregularities. Browser animation timing cannot directly verify hardware VRR or G-Sync state.

Evaluate backlight strobing and Black Frame Insertion (BFI) phase across top, center, and bottom screen zones.

Calibrate smartphone or DSLR tracking cameras for scientific motion blur and MPRT photography.

Stress test GPU 3D rendering with real-time FPS, 1% lows, and frame stability telemetry.

Check display scaling, subpixel font rendering, and edge sharpness with 1-pixel alternating line patterns.

Evaluate font rendering sharpness, edge halos, and subpixel color fringing across sizes.

Inspect RGB, BGR, QD-OLED, and WOLED subpixel geometries and text edge fringing.

Detect non-uniform stretching, egg-shaped circles, and aspect ratio mismatches.

Detect edge cropping and scaling distortion when connecting PCs or laptops to televisions.

Check browser-reported screen dimensions, viewport size, Device Pixel Ratio (DPR), and calculated PPI. Browsers cannot directly verify physical panel native resolution.

View detected screen resolution, device pixel ratio (DPR), color depth, GPU renderer, and browser capabilities.

Accurately compare physical screen sizes, pixel densities (PPI), viewing distance thresholds, and aspect ratios between any two monitors.

Synthesize 12 specialized calibration patterns with deep controls for grid density, line thickness, color channels, typography, and moiré interference.

Map touch digitizer tracking, touch point accuracy, and edge dead zones.

Verify simultaneous 10-point multi-touch tracking, pinch, rotate, and gesture responsiveness.

Benchmark cognitive visual reaction time in milliseconds with statistical consistency scoring.

Measure real-time mouse polling frequency in Hz, jitter, and double-click chatter.

Test game controllers, analog stick drift, circularity error, deadzones, and trigger axes in real-time.

Calibrate audio-video latency and lip-sync synchronization with precision millisecond audio sweep blips.

Inspect real-time Web Audio hardware sample rate, kernel base latency, output buffer latency, and multichannel routing.

Verify left and right stereo audio channel separation, frequency response, and output balance.

Verify microphone input functionality, live level metering, waveform activity, and digital clipping.

Live camera stream preview, resolution verification, and local private snapshot check.

Inspect live 3-axis linear acceleration and gravity vectors reported by device motion sensors.

Inspect device angular rotation, roll, pitch, and yaw angles via browser orientation APIs.

Test tactile vibration motor feedback and custom vibration patterns with safe duration limits.

Read real-time ambient light levels in lux with a brightness gauge, history chart, and recommendations.

Check battery level, charging status, time remaining, and power source in real-time.

Measure internet download speed, latency ping, and connection type directly in your browser.

Automated 5-stage acceptance checklist for inspecting new or used displays during the return window.

Calculate pixel density, dot pitch, and Retina viewing distance thresholds for any display.

Calculate video data rate, uncompressed Gbps, VESA DSC compression, and cable compatibility for HDMI & DisplayPort.

Determine the ideal ergonomic viewing distance, Pixels Per Degree (PPD), and 20/20 human eye Retina threshold.

Side-by-side split screen canvas to align color temperature, RGB gain, and luminance across multi-monitor setups.

Record desktop, windows, or tabs in WebM video or capture full-resolution PNG screenshots.

Generate a print-ready display health certificate for resale or RMA claims.

Step-by-step visual calibration wizard for tuning physical monitor OSD buttons.

Full-field rapid polarity flash waveforms (Deep Purge, Regal, A2) engineered to clear ghosting on electronic paper displays.