Browser diagnostics hub
Fast, private tools for testing what the browser sees.
Check responsive layouts, read your exact display metrics, and inspect the fingerprint your browser exposes. Every tool below runs on your device, with no sign-up and no uploads.
3diagnostic tools
0 bytessent to any server
100%client side
Nosign-up needed
The toolbox
Pick a tool and use it right here.
Am I responsive and responsive design checker
Open full page 100%
A demo page is loaded so the viewports work right away. Paste your own URL to test it. Switch to Single device to check one exact breakpoint. Some sites block embedding (an X-Frame-Options or frame-ancestors policy); if a real URL stays blank, the site refused the connection. Open the URL in a new tab.
Screen size detector
Open full pageWindow inner size
- x -
Screen resolution
- x -
Available screen
- x -
Window outer size
- x -
Device pixel ratio
-
Physical pixels
- x -
Colour depth
- bit
Orientation
-
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Browser fingerprint checker
Open full pageYour fingerprint
Reading...
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Every value here is measured in your browser and never sent anywhere. The hash is a digest of the traits below; the more unusual your combination of traits, the more identifiable you are across sites.
Why nbpl.net
Built to be quick, honest and completely local.
Nothing leaves your device
Every measurement is taken in the browser with plain web APIs. No accounts, no logging, no data collection.
Instant and lightweight
Static pages with minimal script mean tools open in a blink, even on a phone or a slow connection.
Real results, no theatre
Hashes and metrics come from your actual browser. If a value cannot be read, the tool says so instead of faking it.