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Screen Tester

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About Screen Tester

Screen Tester is a free collection of 53 online screen tests and tools for monitors, laptops, TVs, phones and tablets. We help people check their screens quickly, honestly and privately, right in the browser.

53Free tools
6Categories
0Sign-ups

Every screen deserves an honest check, and everyone deserves the tools to do it, free.

A new monitor, a second-hand phone, a TV just out of the box: the only way to know a screen is right is to test it. We build the tests, explain the results in plain English and keep them free for everyone.

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Who We Are

We are a small team of display enthusiasts, developers and writers who build free tools for checking screens and explain what the results mean. Screen Tester is based in Los Angeles, California, and used by people around the world.

Screen Tester started with a simple frustration: checking a new screen for faults meant hunting for test images, guessing what counted as normal and reading forum threads full of conflicting advice. We wanted one place where anyone could open a test, see the problem clearly and know what to do next, without installing software or creating an account.

Today the site covers pixels, color, uniformity, motion and refresh rate, screens by device type, and hardware such as keyboards, mice, microphones and webcams. Every test page pairs the tool with a guide written in plain language, so the result is useful whether you are keeping the screen, returning it or making a warranty claim.

Our Mission And Vision

Why we build Screen Tester, and where we want it to go.

Our Mission

Make screen testing free, simple and trustworthy for everyone.

We turn the checks that used to need special software or expert knowledge into tests anyone can run in a browser in a few minutes.

  • Free tools with no sign-up or download
  • Clear guidance on what is normal and what is a fault
  • Results that stay private on your own device
Our Vision

The first place people go to check any screen, before they buy, keep or return it.

We want every screen buyer to know exactly what they are getting, and every seller and brand to be held to an honest standard.

  • A test for every common screen and device problem
  • Guides that explain faults, policies and fixes
  • Tools that keep pace with new screen technology

The Values Behind Every Test

These six principles guide what we build, what we write and what we leave out.

Free For Everyone

No paywalls, trials or premium tiers. A good screen check should not depend on what you can pay.

Privacy By Design

Tests run on your device. We do not need your results, so we do not collect them.

Accuracy Over Hype

We draw patterns pixel for pixel, cite real standards and never promise fixes that do not exist.

Plain Language

We explain every result in everyday words, so you do not need to be a display expert.

Built For Every Screen

Every test is checked on monitors, laptops, phones and TVs across the major browsers.

Listen And Improve

Many tools and fixes start as user messages. We read every one and act on what we learn.

Our Tools

53 free tests and tools in 6 categories. Pick a category, or browse them all.

Pixel & Panel Tests

Solid colors and flat fields that expose dead pixels, bleed, burn-in and uneven backlight.

9 tools

Color & Image Tests

Gradients, levels and reference colors that show how faithfully a panel draws tone and color.

9 tools

Motion & Speed Tests

Moving patterns and live timers for refresh rate, response time, flicker and variable refresh.

9 tools

Screen Tests By Device

Guided test runs tuned to each kind of screen and panel technology.

12 tools

Hardware Tests

Check the inputs and outputs around your screen, from touch and keys to camera and sound.

8 tools

Checkers & Calculators

Quick numbers for buying, comparing and setting up a screen.

6 tools
PopularDead Pixel TestCycle solid colors to find dead, stuck and hot pixels on any screen.Pixel & Panel Stuck Pixel FixerRapid color flashing that can revive a stuck pixel in 10 to 30 minutes.Pixel & Panel Backlight Bleed TestA pure black screen that shows edge leaks and IPS glow in a dark room.Pixel & Panel Screen Burn-in TestGrey fields that reveal OLED ghost images and image retention.Pixel & Panel Screen Uniformity TestFlat grey to catch dark corners, tinted patches and vertical bands.Pixel & Panel Viewing Angle TestSee how color and contrast shift as you move off-center.Pixel & Panel Sharpness & Text Clarity TestFine lines and small text to check scaling, blur and color fringing.Pixel & Panel Black ScreenA full black screen for bleed checks, dust spotting and OLED tests.Pixel & Panel White ScreenA full white screen for dead pixels, cleaning and a soft light source.Pixel & Panel Color Accuracy TestReference patches to judge how true colors look on your display.Color & Image Color Gamut TestHidden patterns that show whether you really get sRGB or P3 coverage.Color & Image Greyscale Test256 grey steps to spot crushed shadows and clipped highlights.Color & Image Gamma TestCheck whether mid-tones are too dark or washed out.Color & Image Gradient Banding TestSmooth ramps that expose 6-bit banding and visible steps.Color & Image Contrast Ratio TestBlack and white blocks side by side to judge real-world contrast.Color & Image Black Level TestNear-black squares to see how much shadow detail survives.Color & Image HDR TestBright highlights and deep shadows to check HDR output and tone mapping.Color & Image Color Blindness TestSimple color plates to check how your eyes tell hues apart.Color & Image PopularRefresh Rate Test (Hz)Measures the refresh rate your screen is really running right now.Motion & Speed FPS TestLive frames per second while smooth motion plays on screen.Motion & Speed Ghosting TestMoving blocks that reveal trails, smear and overdrive halos.Motion & Speed Response Time TestGrey-to-grey transitions to compare how fast pixels change.Motion & Speed NewInput Lag TestTime how quickly your display reacts after you press a key.Motion & Speed NewPWM Flicker TestSpot brightness flicker that can cause eye strain and headaches.Motion & Speed Motion Blur TestCheck how clear fast-moving text and objects stay.Motion & Speed Blooming TestHalo check around bright objects on Mini LED and local dimming.Motion & Speed G-Sync & FreeSync TestConfirm variable refresh works with no tearing or stutter.Motion & Speed Monitor Screen TestIPS, VA and OLED panel checks for desktop monitors.Devices Laptop Screen TestAn 8-step check for new and second-hand laptops.Devices Mobile Screen TestTouch, burn-in and flicker checks for any phone.Devices iPhone Screen TestOLED, True Tone and touch checks made for iPhone.Devices Android Screen TestAMOLED tint, green line and touch dead zone checks.Devices Tablet & iPad Screen TestUniformity and touch coverage across a big screen.Devices TV Screen TestBlooming, bleed and motion checks right from your TV browser.Devices OLED Screen TestBurn-in, black crush and auto brightness limiting checks.Devices LCD & IPS Screen TestBacklight bleed, IPS glow and uniformity checks.Devices Mini LED TestLocal dimming zones and halo checks for Mini LED.Devices Gaming Monitor TestRefresh rate, overdrive and VRR checks in one run.Devices Projector TestFocus, geometry and keystone patterns for projectors.Devices PopularTouch Screen TestDraw across the screen to find dead touch zones and count touch points.Hardware Keyboard TestPress every key to find ones that stick, repeat or do not register.Hardware Mouse TestCheck buttons, scroll wheel and tracking in one place.Hardware Double Click TestCatch a worn mouse switch that double clicks on its own.Hardware Webcam TestPreview your camera and check resolution and frame rate.Hardware Mic TestSee your microphone level live and play back a quick recording.Hardware Speaker Test (Left & Right)Play left, right and stereo tones to check each speaker.Hardware NewGamepad TestTest every button, trigger and stick drift on your controller.Hardware What Is My Screen ResolutionSee your real resolution, pixel ratio and browser window size.Calculators PPI CalculatorWork out pixel density from screen size and resolution.Calculators Aspect Ratio CalculatorFind the ratio of any resolution or scale it to a new size.Calculators Screen Size CalculatorGet width and height from the diagonal and aspect ratio.Calculators Viewing Distance CalculatorFind the ideal seating distance for your screen size.Calculators Monitor Size ComparisonCompare two screens side by side at their real size.Calculators
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How We Build And Check Our Tests

A screen test is only useful if you can trust it. This is the process every tool and guide goes through.

  1. Start From Real Problems

    We build tests for the faults people actually report: dead pixels, bleed, burn-in, blur and wrong refresh rates.

  2. Follow Real Standards

    We base guidance on published standards and manufacturer documents rather than forum myths.

  3. Draw Pixel For Pixel

    Patterns are drawn at your screen's real resolution and pixel ratio, so nothing is scaled or blurred by the page.

  4. Test On Real Devices

    Each tool is checked on monitors, laptops, phones and TVs in Chrome, Edge, Safari and Firefox.

  5. Explain What Is Normal

    Every test page says what a healthy screen looks like, what counts as a fault and what to do next.

  6. Review And Correct

    We review pages when standards or products change, and fix reported errors once we confirm them.

ISO 9241-300 Display requirementsISO 13406-2 Pixel fault classessRGB D65 White pointWCAG 2.3.1 Flash safetyBrand policies Pixel and warranty terms

What Makes Screen Tester Different

Plenty of sites show a colored screen. We focus on making the result useful.

Pixel-Exact Patterns

We size every test to your device pixel ratio, so a one-pixel line is one real pixel and faults are not hidden by scaling.

Mark, Rate And Report

Tap faults to log their position, rate zones and download a report you can attach to a return or warranty claim.

A Guide With Every Test

Each tool sits next to a clear guide: what the fault is, how much is normal, and your options if it fails.

Safety Built In

Tools that flash ask first and offer a gentle, no-flash mode, in line with accessibility guidance on flashing content.

Who Uses Screen Tester

From first-time buyers to repair benches, these are the people we build for.

Screen Buyers

Checking a new or used monitor, TV, laptop or phone before the return window closes.

Dead pixel test

Gamers

Confirming refresh rate, checking ghosting and input lag, and tuning a gaming setup.

Refresh rate test

Creators And Designers

Checking color, gamma, uniformity and sharpness before editing photos and video.

Color accuracy test

Repair And IT Teams

Testing screens, touch panels, keyboards and webcams before handing devices back.

Touch screen test

Privacy, Trust And Our Policies

The short version of how we treat you and your data. Each card links to the full policy.

Privacy

Tests run on your device and results are not sent to us. Details you send through the contact form are used only to reply and are never sold.

Privacy Policy

Cookies

We use cookies to keep the site working, remember settings such as dark mode and understand how pages are used.

Cookie Policy

Terms Of Use

Our tools are free for personal and business use, provided as they are. Please do not copy or resell the site or its content.

Terms of Use

Disclaimer

Results are a visual guide, not a certified lab measurement. Screen Tester is independent and not affiliated with any screen maker.

Disclaimer

Editorial And Corrections

Guides are checked against standards and manufacturer documents. When you report an error, we verify it and update the page.

Report an error

Independence

No brand pays us to rate its screens. Our guidance is written to help you, whatever screen you own.

Read our guides

Support And Help

Stuck on a test, found a bug or have an idea? Here is where to go.

Contact Us

Send a message to our team at info@screentester.co. We usually reply within 2 business days.

Contact page

Support Center

Fixes for common problems, such as full screen not working or tests looking soft.

Get support

FAQ

Quick answers about our tests, results, devices and privacy.

Read the FAQ

Report A Bug

Something broken or wrong? Tell us the page and your browser and we will look into it.

Report a bug

Request A Tool

Need a test we do not have yet? Suggest it and help shape what we build next.

Request a tool

Review Us

Found Screen Tester useful? A short review on Trustpilot helps others find us.

Review on Trustpilot

Follow Screen Tester

New tools, screen tips and buying advice on the platforms you already use. We are @screentesterco everywhere.

X@screentestercoFacebook@screentestercoInstagram@screentestercoYouTube@screentestercoTikTok@screentestercoPinterest@screentestercoLinkedIn@screentestercoReddit@screentestercoThreads@screentesterco Leave A ReviewReview Screen Tester on Trustpilot

About Screen Tester FAQ

Answers to what people ask most about who we are and how our tools work.

What is Screen Tester?

Screen Tester is a free website with 53 online tests and tools for monitors, laptops, TVs, phones and tablets. It helps you find dead pixels, backlight bleed, burn-in, uneven brightness, blur and refresh rate problems, and test keyboards, mice, microphones and webcams.

Is Screen Tester really free?

Yes. Every test and tool is free to use, with no sign-up, no trial and no download. You can use the tools for personal checks or at work.

Who is Screen Tester for?

Anyone checking a screen: people buying a new monitor, TV or phone, gamers tuning a setup, photographers and designers checking color, and repair and IT teams testing devices before handing them over.

Do I need to install anything?

No. Every test runs in a modern web browser such as Chrome, Edge, Safari or Firefox. Open the page, press Full Screen and the test runs on the screen in front of you.

Does Screen Tester collect my test results?

No. The tests run on your own device, and the marks, ratings and reports you create stay in your browser. They are only shared if you download a report and send it yourself.

How accurate are the tests?

The patterns are drawn pixel for pixel at your screen resolution, so what you see is the panel itself. They are visual tests rather than lab measurements with a colorimeter, so they are ideal for spotting faults and comparing settings.

Which devices and browsers does Screen Tester support?

Any device with a modern browser: Windows and Mac computers, Chromebooks, Android and iPhone, tablets and smart TV browsers. On iPhone, Safari does not allow full screen for web pages, so tests fill the browser window.

How can I suggest a tool or report a mistake?

Use the contact page and choose Tool request or Bug report. Every message is read by our team, and many of our tools and fixes started as suggestions from users.

Ready To Test Your Screen?

Pick from 53 free tools. No sign-up, no download, results in minutes.

Start Testing