Screen Soft Light / Specimen / MONITOR TEST #4488FF · RGB 68 · 136 · 255

No. 001 · MONITOR TEST

Monitor test online for pixels, color and backlight

  • 01 Dead pixel detection
  • 02 Backlight bleed check
  • 03 Color accuracy test

Test any display for dead pixels, backlight bleed, color accuracy and screen uniformity using free full-screen color tools. Works on monitors, laptops, phones and tablets — no app or download required.

Start monitor test
Press F to go fullscreen · Press Esc to exit
Enter HEX #4488FF 210 × 297 mm
§ 01

Complete display testing with color screens

A full monitor test covers four areas: pixel integrity (dead and stuck pixels), backlight quality (bleed, uniformity), color accuracy (RGB purity, white balance) and viewing angles (color shift when viewed off-center). This tool provides all the solid color screens needed for each test — go fullscreen and examine your display systematically.

§ 02

Open the black screen in a completely dark room at maximum brightness.

Backlight bleed and uniformity testing

Open the black screen in a completely dark room at maximum brightness. Backlight bleed appears as lighter areas around the edges or corners of the panel — common on IPS monitors. Some bleed is normal, but excessive bleed affects dark scene visibility in movies, games and photo editing. The white screen test reveals the opposite: dim spots or uneven brightness across the panel.

§ 03

When to test your display

Test new monitors before the return window closes, refurbished displays at delivery, and any screen after physical damage or repair. Regular testing is valuable for displays used in creative work where color accuracy and pixel integrity directly affect output quality.

§ 04

Understanding your test results

Not every anomaly is a defect worth returning a monitor for. A few things are normal: slight backlight bleed at the edges of LCD panels, minor IPS glow that shifts with viewing angle, and very small color uniformity differences visible only from close range. Actual defects include: dead or stuck pixels visible at normal viewing distance, heavy backlight bleed visible during dark content, color tinting (pink, green or yellow patches) on gray backgrounds, and flickering or line artifacts. If in doubt, view dark movie scenes at normal distance — if defects are visible during regular use, the monitor may warrant replacement.

Procedure

Three moves to peak output

  1. 01

    Test for pixel defects

    Cycle through white, black, red, green and blue screens at full brightness. Look for dots that are the wrong color or permanently dark.

  2. 02

    Check backlight uniformity

    Open the black screen in a dark room and go fullscreen. Look for light patches around the edges — this is backlight bleed.

  3. 03

    Verify color accuracy

    Open each primary color (red, green, blue) fullscreen. Colors should look pure and even across the entire panel without visible gradients or banding.

Inquiries

Questions worth asking

Q.01 How do I test my monitor online?
Use the full-screen color tools to check for dead pixels (white screen), stuck pixels (black screen), color accuracy (red, green, blue screens), and backlight uniformity (gray via the brightness slider). No software download needed.
Q.02 What should I check when testing a new monitor?
Test for dead and stuck pixels across all colors, check backlight bleed on a black screen in a dark room, verify color uniformity on white and gray screens, and confirm that RGB primaries look clean without color casting.
Q.03 Can I test my phone or tablet screen too?
Yes. This tool works on any device with a web browser. Open any color screen and go fullscreen to test phones, tablets, laptops and external monitors for pixel defects and color issues.
Cross-reference

Try adjacent plates

Enough specimen notes.

Go make the screen behave.

Start monitor test