FreeScreenTest

A screen test is a diagnostic tool that checks your display for defects, performance issues, and calibration accuracy. Common tests include dead pixel detection, refresh rate verification, color accuracy, and backlight uniformity. These tests help ensure your monitor, phone, or tablet is functioning properly.

FreeScreenTest offers 18 professional display tests completely free. Simply choose a test from the homepage, click "Start Test", and follow the on-screen instructions. No signup, download, or payment required. All tests run directly in your browser on any device.

A dead pixel is a pixel that remains permanently black (off), while a stuck pixel shows a single color (red, green, or blue). Dead pixels cannot be fixed as the transistor is completely broken. Stuck pixels can sometimes be fixed using pixel exercise programs. Most manufacturers have dead pixel policies for warranty returns.

Use our Refresh Rate Test to verify your monitor is running at its advertised speed (60Hz, 144Hz, 240Hz, etc.). The test measures actual FPS in real-time. Make sure to set your monitor to the correct refresh rate in Windows/Mac display settings before testing.

Backlight bleeding is light leakage from LCD monitor edges, most visible on black screens in dark rooms. It's especially common on IPS panels. Some edge glow is normal, but excessive bleeding (visible 5cm+ from edges) may warrant a warranty return.

IPS panels offer best viewing angles and color accuracy but may have backlight bleed. VA panels have superior contrast and black levels but slower response times. TN panels are fastest (best for gaming) but have poor viewing angles and colors. Use our Viewing Angle Test to identify your panel type.

6500K (D65) is the industry standard for accurate color work, matching daylight. 5000K is warmer and easier on eyes for long sessions. 9300K is cooler and brighter but less accurate. Use our Color Temperature Test to calibrate your monitor to your preferred setting.

Start with our Gamma Test (target 2.2), then Color Temperature Test (target 6500K), followed by Contrast Ratio Test. Adjust monitor settings (brightness, contrast, color) until tests show optimal results. For professional calibration, a hardware colorimeter is recommended.

Input lag is the delay between your action (click/keypress) and the screen updating. Low input lag (under 10ms) is critical for competitive gaming. TVs often have 50-100ms lag. Use our Input Lag Test to measure your display's responsiveness.

Use our HDR Test to check if your monitor supports HDR10 and wide color gamuts (P3, Rec.2020). The test also detects peak brightness capability. Note: HDR must be enabled in your operating system settings first for the test to work properly.