Monitor Hz & frame skipping test
Measure live browser refresh rate (Hz), compare 60/120/240 Hz motion, and check for skipped frames.
Open Hz test →Test Your Display Down To The Smallest Detail
MonitorTest is a 100% browser-based, client-side display testing platform with 16 visual checks for pixel defects, panel artifacts, calibration and motion performance.
Estimated browser refresh rate: Calculating...
1. Defect & Artifact Tests
Dead & Stuck Pixel Test
Cycle pure colors to locate permanently dark, glowing, or stuck RGB sub-pixels.
IPS Glow / Light Bleed
Output true black. Check for uneven lighting or 'glowing' seeping from panel corners in a dark room.
OLED Burn-in & Retention
Use 50% gray and deep red screens to spot ghosted UI elements (taskbars/HUDs) permanently etched into your OLED.
Screen Tearing (V-Sync)
Use rapid horizontal movement to compare visible tearing while changing V-Sync or VRR settings; this does not certify that either feature is working.
Panel Uniformity / Dirty Screen
Test for the "Dirty Screen Effect" (DSE). Colors should look identically bright from corner to corner.
Stuck Pixel Fixer Tool
Forces a localized strobe at 60Hz. It has a chance to revive stubbornly stuck (not dead) sub-pixels.
2. Calibration & Gamut Tests
Gamma Calibration (2.2)
Verify if your display is accurately targeting a 2.2 Gamma curve using visual blend blocks to ensure correct brightness.
Black Saturation (Black Crush)
Check if you can distinguish RGB 1 from RGB 0. Critical for dark movie scenes and horror games.
White Saturation (Blooming)
Check if extreme RGB 254 details are blooming into pure white, causing you to lose highlight detail.
Color Banding (8-Bit / 10-Bit)
Check for smooth color gradations without distinct stepped 'bands' to evaluate your panel's bit depth.
Color Distance / Contrast Ratio
Evaluate exact color separation thresholds between distinct hue values on the sRGB spectrum.
3. Motion & Sub-pixel Rendering
UFO Ghosting & Overdrive
Track fast-moving UFO objects. Test your overdrive setting; too low causes smearing, too high causes inverse halos.
Response Time / Input Lag Demo
Test the visually perceived delay between an instant click action and the pixel color changing on screen.
Viewing Angle Washout (TN/VA/IPS)
View geometric patterns from sharp off-center angles to identify extreme color wash-out specific to your panel type.
Sub-Pixel Rendering & Text Clarity
Micro-text and 1px lines help identify anti-aliasing issues caused by non-standard RGB sub-pixel layouts like BGR.
Pixel Inversion / Moire Flicker
Examine tight checkerboards to see if screen flickering occurs due to LCD voltage inversion cycles.
Calculate, test and keep the result
Go beyond solid-color screens: compare pixel density and collect your visual checks in a report you can keep.
HDMI & DP max Hz calculator
Check required Gbps bandwidth for 1080p, 1440p, Ultrawide, and 4K across HDMI and DisplayPort versions.
Open cable calculator →OLED burn-in & 5% gray test
Inspect OLED monitors and AMOLED phones for taskbar/icon burn-in and near-black vertical banding.
Open OLED test →Dead pixel warranty evaluator
Check bright vs. dark sub-pixel thresholds across Dell, ASUS, LG, MSI, Samsung, AOC and ViewSonic.
Open warranty checker →Visual screen size comparison
Compare two display diagonals, aspect ratios and PPI densities side by side to scale.
Compare sizes →PPI and pixel-pitch calculator
Calculate PPI, pixel pitch, physical panel dimensions and an approximate angular threshold.
Open calculator →Printable monitor test report
Record pixel, uniformity, backlight and motion observations; download the summary or print it to PDF.
Create report →Related pages
Dead Pixel Test and the Dead Pixel Guide · Ghosting Test and the Ghosting Guide · IPS Glow Test and the IPS Glow Guide · Screen Tearing Test and the Screen Tearing Guide
Observation notebook
We do not diagnose automatically. Record what you see, change one setting, and compare under the same conditions. Records stay in this browser and are not sent to a server.