Works on smart TV browsers, monitors, laptops and phones. In manual mode use arrow keys or tap to change colors, Esc to exit.
What is a dead pixel?
A dead pixel is a tiny dot on your screen that stays black no matter what color is shown, because that pixel no longer receives power. A stuck pixel looks similar but stays lit on a single color - red, green or blue - and can often be revived. This free dead pixel test fills your screen with solid colors so you can spot either one in seconds, on a TV, monitor, laptop or phone.
Dead pixel
Stays black on every color you show. It usually means the pixel gets no power, which is a hardware fault and is normally not fixable. Check whether your warranty covers it.
Stuck pixel
Locked on one color such as red, green or blue because a subpixel is not switching. Stuck pixels can often be revived with the stuck pixel fixer.
How to test your screen for dead pixels
- Press Start dead pixel test. In automatic mode the screen fills with each color for 10 seconds; in manual mode you switch them yourself.
- Look closely across the whole panel for dots that stay black (dead) or stuck on a single color.
- Dead pixels show up best on white, stuck pixels stand out on black.
- On a TV, automatic mode is safest. If your remote works in the browser you can also use the arrow keys, or tap the screen on a phone.
What each test color reveals
- White and light gray - dead pixels appear as tiny black dots, and dust or smudges become visible.
- Black - bright stuck-on pixels stand out, and on LCD or LED TVs you can spot backlight bleed and clouding at the edges in a dark room.
- Red, green and blue - stuck subpixels that are locked on a single color.
- Gray 50% - panel uniformity and the "dirty screen effect", the faint patches common on larger LCD panels.
How to fix a stuck pixel
Open the Stuck pixel fixer. It rapidly flashes random colors across the screen. The fast color changes can massage a stuck subpixel back into working order.
- On a TV, position the flashing screen so it covers the stuck pixel, then leave it running for 10 to 20 minutes.
- Repeat a few times if the pixel is stubborn. It often works on stuck pixels, but a truly dead pixel cannot be brought back this way.
Dead and stuck pixel FAQ
Is this dead pixel test free?
Yes. It is completely free and runs entirely in your browser. Nothing is installed and nothing is uploaded.
Does it work on a TV?
Yes. Open this page in your smart TV's built-in browser, or mirror it from a phone or laptop. Choose automatic mode if your TV remote does not move between the colors - the test will change them for you every 10 seconds. No TV browser? You can also control your TV from your phone with the TV Remote app.
What is the difference between a dead and a stuck pixel?
A dead pixel stays black on every color. A stuck pixel is fixed on one color such as red, green or blue. Stuck pixels can sometimes be revived, dead pixels usually cannot.
What causes a stuck pixel?
A subpixel gets stuck showing one color, often after a long static image or a temporary glitch. Unlike a dead pixel it still receives power, which is why it can sometimes be revived.
How long does it take to fix a stuck pixel?
Run the stuck pixel fixer for 10 to 20 minutes and repeat a few times. Some pixels clear in minutes, others take several sessions, and some never recover.
Should I press or rub a stuck pixel?
Be careful. Gentle pressure methods exist but pressing too hard can damage more pixels. Try the flashing stuck pixel fixer first, it carries no risk.
How many dead pixels are normal?
Manufacturers allow a small number of dead or stuck pixels under the ISO 9241 standard before a panel counts as defective. Check your brand's dead-pixel policy and warranty terms.
Does it work on OLED TVs?
Yes for testing, but most OLED problems are temporary image retention or burn-in rather than stuck pixels. Use your TV's built-in Pixel Refresher in the settings menu for retention.
Will the stuck pixel fixer damage my screen?
No. It only cycles colors quickly over the area. Run it for 10 to 20 minutes at a time and repeat if needed.
Control your TV from your phone
One app for Roku, Fire TV, Samsung, LG, Android TV and more. No lost remote, no dead batteries.
