Quick answer
What Stuck Pixel Test tells you
Use controlled solid colors to look for pixels that remain fixed on one subpixel color.
- Observed here
- Red, green and blue screens, Black and white comparison, Custom color.
- How to interpret it
- A spot that keeps the same color across different solid backgrounds is an observation worth comparing. This tool neither repairs pixels nor confirms the physical cause of the spot.
- Important limit
- Results reflect events and values exposed by this browser.
- Data handling
- Test values are calculated in this browser. Device Test Bench does not store a test result or create a device fingerprint.
Useful next comparison: Compare several backgrounds and another application without pressing, rubbing or applying heat to the panel.
Understanding the result
What a result means
A subpixel that remains red, green or blue across backgrounds is consistent with a stuck-pixel observation, while a consistently dark point may have a different cause. The page does not run rapid flashing or claim to repair either condition.
Confirm the pattern by repeating red, green and blue screens. Results reflect events and values exposed by this browser.
How to use this test
- Read the privacy and compatibility notes.
- Start the test and interact only inside the marked test area.
- Repeat the action several times and compare the live indicators.
- Use the troubleshooting section before deciding that hardware is faulty.
What this test checks
- Red, green and blue screens
- Black and white comparison
- Custom color
- Fullscreen inspection
What this test cannot check
Results reflect events and values exposed by this browser.
This test does not certify hardware or replace professional inspection.
No flashing repair pattern is provided.
A visual observation is not a warranty determination.
Common problems and troubleshooting
Check several solid colors and black/white, then verify the mark stays at one physical location. Exclude dust and image retention before consulting the monitor warranty or manufacturer guidance.
- Repeat the same observation. Focus the test surface and repeat “Red, green and blue screens” three times under the same conditions.
- Change one condition. Compare “Black and white comparison” after changing only the relevant port, connection, browser setting or application.
- Rule out focus or interception. Close overlays and reserved shortcuts, keep the page visible and confirm that the live indicator changes during the action.
- Keep the result within its limit. Results reflect events and values exposed by this browser.
If the same pattern remains across relevant applications and connections, give the manufacturer or a qualified technician the repeatable observations instead of a guessed fault label.
Browser compatibility
The test needs only color rendering and optional fullscreen support. Color management, HDR and browser scaling can alter appearance but do not allow the page to read individual panel electronics.
| Browser | Reference status | Evidence basis | Version | Notes | Checked |
|---|---|---|---|---|---|
| Chrome | Supported | Expected baseline | Not recorded | Feature detection is authoritative; permissions, platform and device support can change availability. | 2026-08-27 |
| Microsoft Edge | Supported | Expected baseline | Not recorded | Feature detection is authoritative; permissions, platform and device support can change availability. | 2026-08-27 |
| Firefox | Partial | Expected baseline | Not recorded | Feature detection is authoritative; permissions, platform and device support can change availability. | 2026-08-27 |
| Safari | Partial | Expected baseline | Not recorded | Feature detection is authoritative; permissions, platform and device support can change availability. | 2026-08-27 |
Privacy information
Test values are calculated in this browser. Device Test Bench does not store a test result or create a device fingerprint.
The public analytics allowlist does not accept pressed keys, typed text, pointer coordinates, media labels, device IDs, recordings, video frames or controller input. Test results are not written to LocalStorage.
Primary technical references
These specifications define the browser signals used by this test. They document web-platform behavior; they do not certify a particular device.
Frequently asked questions
Is this Stuck Pixel Test free?
Yes. The test works without an account, download or payment.
Is my test data uploaded?
Test values are calculated in this browser. Device Test Bench does not store a test result or create a device fingerprint.
Does this result prove my hardware is faulty?
No. It shows what the browser can observe. Repeat the test, compare another browser or device, and seek qualified support when the result matters.
Turn this result into a useful comparison
A working indicator or an unexpected event is only a starting point. Choose a plan to compare another application or connection and record what changed.
- Plan a Suspicious Screen Pixel Check — Compare a suspicious display spot across solid colors and applications, then prepare a cautious manufacturer-support record without pixel-repair claims.