Free screen tests · Plain-English fixes

Test, fix & tune your screen. Free.

Browser tools that find dead pixels, bleed and flicker in about a minute, then plain-English fixes based on manufacturer documentation and established fixes. No sign-up.

Start dead pixel test Fix a problem

What are you checking?

Monitor Laptop GPU Phone & TV pixel test

Screen tests

Pick a test. Results in a minute.

All tools

Most used

Dead pixel test

Full-screen colors with keyboard and tap controls, plus a quick stuck-pixel fixer. Works on monitors, laptops, phones and TVs.

Run test

Stuck pixel fixer

Flashes colors over one stuck pixel, with a timer.

Refresh rate test

Measures your real Hz, plus motion and flicker checks.

Backlight bleed test

Dark-room black, gray and white levels with a grid.

Burn-in test

OLED solid colors, gradients and a retention check.

Ghosting test

A moving shape on three backgrounds for overdrive trails and halos.

Color & uniformity test

Solid colors, gray steps, gradients and a uniformity grid.

Your screen, right now

Measured by your browser. Nothing is sent anywhere.

—Screen resolution

—Pixel ratio

…Refresh (est.)

—Colour gamut

Common problems

What's wrong with your screen?

Monitor flickeringCables, refresh rate, VRR, drivers Stuck or dead pixelTest, try a fix, or claim warranty Monitor ghostingOverdrive settings that help Laptop thermal throttlingStop the slowdowns GPU not detectedWindows 11 step-by-step GPU running hotWhat is normal, what to do Lines across the screenCable, setting or panel?OLED flicker in gamesVRR flicker and what helps Uneven color or tintRun the color and uniformity test

Fix by device

Which screen is it?

MonitorPixels, flicker, lines, ghosting LaptopBuilt-in screen problems TVDead pixels, burn-in, picture modes Phone and tabletiPhone, iPad, Android screens

Latest fixes

Dated & updated

All fixes

Lines

Lines on Monitor Screen? How to Find the Cause and Fix It

Open the monitor's own menu first. Lines over the menu point to the panel; a clean menu points to the PC side…

GuideNew 25 Oct 2026

TV pixel

Dead Pixel on TV? How to Test It and What to Do Next

Check the dot in the TV's own menu, run a full-screen test, then go to the return window or warranty…

GuideNew 25 Oct 2026

Stuck pixel

How to Fix a Stuck Pixel on Your Monitor

Confirm it with a color test, run a pixel fixer for 10 to 20 minutes, then check the return window…

GuideUpdated 24 Oct 2026

How we work

Honest tools. Plain fixes.

About GigaScreens → How we test → Editorial policy →

Tools tested in every major browser

Tested in Chrome, Edge, Safari and Firefox on desktop and mobile. Fix guides are based on manufacturer documentation and established fixes.

No pop-ups, no redirects

Tools never show ads during a test. Ever.

Dated & re-checked

Guides show who wrote them and when they were last checked.