Pixel-Perfect
Screen Testing
We believe every display deserves proper evaluation. ScreenTester.io offers professional, free, browser-based screen testing tools — no downloads required.
Always Free
No paywalls, no premium tiers. 20+ professional testing tools available to everyone — dead pixels, backlight bleed, color accuracy and more, all completely free.
Browser-Native
Built on modern browser rendering capabilities. No software or drivers to install — just open the page, press F11 for fullscreen, and start testing at pixel-level precision.
All Devices
Phones, tablets, laptops, monitors, TVs — any device with a screen. We provide dedicated testing guides tailored to different device types and panel technologies.
Born from a bad screen
ScreenTester.io was born out of frustration. A brand-new monitor arrived with obvious backlight bleed visible on a black background, but the retailer dismissed it as "within acceptable range." We realized consumers need professional, objective testing tools to back up their claims.
Existing screen testing software either required downloads or offered limited functionality. We wanted a full-featured testing platform that works right in the browser — covering dead pixels, backlight bleed, color accuracy, greyscale, refresh rate, and everything else.
So we built it with modern web technology. From new device inspection to second-hand purchases, from design color calibration to gaming optimization — ScreenTester.io helps you see every pixel clearly.