Tool accuracy and privacy
Last updated: June 5, 2026
Commitment: We prioritize absolute transparency. All diagnostics run client-side in your browser, and no personal data or device specs are transmitted to any server.
How browser-based tools work
Our diagnostic tools execute entirely within your web browser using standard client-side JavaScript. When you open a tool page, the browser queries local parameters and renders visual templates like grids or color blocks. This allows you to check display properties and inspect physical defects immediately without installing external software.
Values read locally in the browser
Our tools access standard window and screen interface properties to read display metrics. These values include the screen width and height, current layout viewport dimensions, device pixel ratio, and rendering frame intervals. All queried values are used instantly to update the on-screen display interface and are never saved on our servers.
Browser API limitations
Browser sandboxes restrict web pages from accessing raw hardware and graphics card configuration settings. Consequently, JavaScript cannot directly query physical monitor specifications like manufacturer names, panel models, or backlight types. This safety restriction means our diagnostics must estimate hardware specifications based on the available browser-reported values.
Scaling, zoom, and multi-monitor edge cases
Several settings can cause browser-reported metrics to differ from the physical specifications of your monitor. Operating system display scaling and web browser zoom levels alter the reported layout viewport and device pixel ratio. For instance, a four-K screen with two hundred percent scaling will report a standard full-HD viewport resolution to the browser.
External monitors and multi-screen setups also introduce variations. The browser queries parameters from the active screen where the window is positioned. Moving the browser window between screens will update the reported diagnostic values to match the target monitor.
What the tools cannot know
Our diagnostic utilities cannot verify hardware properties such as color accuracy, physical pixel response times, or exact backlight uniformity. They also cannot programmatically detect dead sub-pixels, screen scratches, or backlight bleed. These hardware characteristics must be inspected visually by the user under recommended conditions, which are described on our testing methodology page.
Privacy policy summary
Your privacy is protected because our diagnostic checks run locally on your device. We do not use first-party cookies or run tracking analytics scripts. The site loads styling fonts from Google Fonts and may show advertisements via Google AdSense, which handle data according to their own policies.
For more details about our editorial standards, you can review our editorial policy. If you have questions about accuracy or privacy, please contact us.