Our Mission
Our mission is simple: to offer a comprehensive suite of professional-grade display diagnostic tools that anyone can use for free, without downloading specialized software. Whether you are checking a brand-new monitor for dead pixels, calibrating a TV, or testing an older laptop screen for backlight bleed, ScreenTestTool provides the engines you need.
Why Trust ScreenTestTool?
Privacy-First Architecture
All diagnostic tests run entirely on your local machine using client-side JavaScript and HTML5 Canvas. We never upload your images or display data to any server.
Modern UX & Design
We believe utilities don't have to look ancient. ScreenTestTool uses a premium, developer-focused design language to make testing an intuitive and seamless experience.
Zero Installation
Everything works right in your web browser. There are no executables to run, no plugins to install, and no waiting.
Our Diagnostic Suites
PIXEL & HARDWARE DEFECTS
Get in Touch
Have feedback, spotted a bug, or want to suggest a new diagnostic tool? We'd love to hear from you. Contact our team.