Your files stay on your device

# Monitor test

Run full-screen test patterns to spot dead pixels, backlight bleed, clouding, and banding, mark faults on a screen map, and export a PNG report.

Place marks on the map to build the report.

This tool cannot see your screen. It shows known patterns and your eyes do the detecting, so clean the panel and work in a dark room before you judge anything. Dust mimics dead pixels; tilt mimics bleed. The report, the marks, and any photo stay in this tab: the PNG is drawn locally and nothing is uploaded. The tool says nothing about warranty terms, which manufacturers set by pixel count and location.
Options

## More device tests

- [Dead pixel test](/device/dead-pixel)
- [Refresh rate test](/device/refresh-rate)
- [Screen & viewport](/browser/screen)
[All device tests](/device)

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Canonical HTML: https://nutter.tools/device/monitor-test
Markdown version: https://nutter.tools/device/monitor-test.md
Plain-text version: https://nutter.tools/device/monitor-test.txt
Agent index: https://nutter.tools/llms.txt