Updated 6 November 2026

Guided check

A short or a longer sitting, in a fixed order. You still make every judgement. The page only changes the field and keeps your notes on this device.

Before you start

  • Dry microfibre cloth only. Do not press the panel.
  • Normal viewing distance, then closer if you want.
  • Leave night mode or filters as you use them, and mention them in the notes.
  • Ordinary light for most fields. Dim the room when you reach black if edges are the question.

Off by default. The cycle is slow. It is not a repair flash.

Choose a length

Quick is the core look. Thorough adds secondary colours, darker greys and more ramps.

Visual inspection — this tool does not automatically detect defects.

Quick fields

  1. White · #FFFFFF
  2. Black · #000000
  3. Red · #FF0000
  4. Green · #00FF00
  5. Blue · #0000FF
  6. 50% grey · #808080
  7. Greyscale · horizontal · #000000 → #FFFFFF

Thorough fields

  1. White · #FFFFFF
  2. Black · #000000
  3. Red · #FF0000
  4. Green · #00FF00
  5. Blue · #0000FF
  6. Cyan · #00FFFF
  7. Magenta · #FF00FF
  8. Yellow · #FFFF00
  9. 5% grey · #0D0D0D
  10. 10% grey · #1A1A1A
  11. 25% grey · #404040
  12. 50% grey · #808080
  13. Black · #000000
  14. Greyscale · horizontal · #000000 → #FFFFFF
  15. Greyscale · vertical · #000000 → #FFFFFF
  16. Greyscale · horizontal · #000000 → #FFFFFF
  17. Red channel · horizontal · #000000 → #FF0000
  18. Green channel · horizontal · #000000 → #00FF00
  19. Blue channel · horizontal · #000000 → #0000FF
  20. Greyscale · horizontal · #000000 → #1A1A1A
  21. Greyscale · horizontal · #E6E6E6 → #FFFFFF

Your notes

Run a check to list the fields that were actually shown. You can write notes without a run. They are not a measurement.

    A name for your notes only. Do not enter a serial number.

    Questions

    How long does it take?

    Quick is often a few minutes if you look rather than click through. Thorough is often nearer ten minutes, and longer if you pause. Both timings are a suggestion. Nothing is locked to a clock.

    Can I skip?

    Yes. Next moves on, Previous goes back, and Exit leaves. Finish on the last field closes the test and lists what was shown.

    Where do the notes go?

    They stay in this browser unless you download the JSON file or print. Keep on this device uses local storage. Clear saved notes deletes that copy. Nothing is uploaded.

    Is the summary a certificate?

    No. It is a list of fields and whatever you typed. White Screen Checker did not see the panel.