Online Screen Testing Tools
Choose a browser-based screen test by the result you need: pixels and black levels, color and signal, or calibration and contrast. The tools provide visual display checks.
Choose a screen test by task
Shared screen-testing boundaries
- These tools support visual checks under the current room, brightness, and viewing conditions; they do not replace calibrated measurement.
- A browser cannot fully measure panel, backlight, or connection behavior. Record conditions and compare with a reference device when needed.
- Test data and observations are processed in the browser; the tools do not need an upload of your display data.
All Tools
26 tools available. Select one to open it here.
Touchscreen Test
Use the touch grid to check touch-point count, trace continuity, edge coverage, and possible dead zones on a touchscreen.
Black Level Test
Step through near-black patches from 1 to 32 and record the gray level that first separates from a pure-black background on your display.
Backlight Bleed Test
Use a full-screen black display to inspect edge and corner bright spots, then record the conditions, severity, and affected regions.
Color Banding Test
Compare controlled gradients, quantization, and dithering to record visible bands, level jumps, or grain on a display.
Monitor Color Accuracy Test
Use reference patches for a visual cast check, or enter measured Lab data to calculate CIEDE2000 ΔE00.
Display Color Depth Test
Read the browser-reported color depth and inspect a fixed 256-level pattern; this page cannot identify the panel's native bit depth.
Screen Size Calculator
Enter a screen diagonal and aspect ratio to calculate the corresponding display width and height.
Screen Aspect Ratio Calculator
Enter a screen width and height to calculate the current aspect ratio, or compare dimensions against a target ratio.
Dead Pixel Test
Clean the screen, switch through six full-screen solid colors, and mark the locations of fixed bright, dark, or stuck-color pixels.
Grayscale Test
Display discrete grayscale, near-black, and near-white levels to record which adjacent steps remain distinguishable, along with neutral color cast and regional unevenness.
Screen Resolution Detector
Read the current viewport, screen CSS pixels, device pixel ratio, and estimated physical pixels in the browser.
Monitor Color Test
Show controlled colors and gradients full-screen to check dead pixels, tint, uniformity, and visible rendering issues.
Monitor Color Calibration Guide
Follow a practical five-step monitor setup for brightness, contrast, gamma, white point, RGB balance, and a final visual check.
Monitor Color Gamut Test
Compare browser-reported sRGB, Display-P3, and Rec.2020 support with color patches, gradients, and a readiness checklist.
Monitor Contrast Test
Use black, white, window, and checker patterns to inspect shadow detail, highlight clipping, and perceived contrast.
White Screen
Display a fixed digital white screen (#FFFFFF) as a uniform field or clean camera background; adjust brightness on the display or system.
Red Screen
Display a fixed digital red screen (#FF0000) for observing red-channel rendering, individual pixels, or a camera background; adjust brightness on the display or system.
Green Screen Test
Open a pure green fullscreen to inspect the green channel, pixel anomalies, and large-area uniformity, with optional framing guides.
Blue Screen
Show a fixed pure-digital-blue background in one click, enter full screen, and optionally leave automatically after a timer.
Gray Screen Test
Show controlled digital gray levels in fullscreen to observe panel uniformity, tint, and near-black behavior.
Yellow Screen
Display a fixed digital yellow screen (#FFFF00) for observing red/green color mixing or using a yellow photography and camera background; adjust brightness on the display or system.
Orange Screen
Display a fixed digital orange screen (#FF8C00) for observing warm color rendering or using a warm photography and camera background; adjust brightness on the display or system.
Pink Screen
Display a fixed digital pink screen (#FF69B4) for observing red/blue color rendering or using a pink photography and camera background; adjust brightness on the display or system.
4:4:4 Chroma Subsampling Test
Render colored text and one-pixel patterns to visually check whether a display path preserves chroma detail.
LCD Pixel Inversion Test
Show high-frequency alternating pixel patterns and record visible flicker, scan lines, or pixel-walk effects on an LCD.
Display Test Card Generator
Choose a resolution and test layers to create PNG or SVG cards for TVs, monitors, and projectors.