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 & stuck pixel test

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

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Backlight bleed

Coming soon: dark-room glow check.

Refresh & ghosting

Fix ghosting, check your 144 Hz.

Colour & uniformity

Calibrate a budget monitor.

Flicker fixes

Cables, refresh rate, VRR.

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

Latest fixes

Dated & updated

All fixes

Stuck pixel

How to Fix a Stuck Pixel on Your Monitor (Without voiding warranty)

Quick Answer: To fix a stuck pixel, first run a “pixel flasher” tool (like JScreenFix) for at least 30…

GuideUpdated 17 Oct 2026

Ghosting

How to Fix Monitor Ghosting: The Pragmatic Guide

Quick Answer: To fix monitor ghosting, access your monitor’s OSD (On-Screen Display) and increase the…

GuideUpdated 27 Jan 2026

GPU

GPU Not Detected in Windows 11? A Step-by-Step Fix Guide

Quick Answer: If your GPU is not detected in Windows 11, the most common culprit is a corrupted driver…

GuideUpdated 15 Jan 2026

How we work

Honest tools. Plain fixes.

About GigaScreens →

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 a real author and a last-tested date.