Free · private · no download
Test your screen in your browser
Dead pixels, backlight bleed, burn-in, refresh rate and more, for monitors, phones, laptops and televisions. Every test says what it measured and what only your eyes can judge.
- No account and no sign-in
- Nothing leaves your device
- Works offline after one visit
Esc to exit · arrow keys change the field · space runs them in turn
White · #FFFFFF Arrows field Space cycle Esc back
- Screen
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- Pixel ratio
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- Gamut
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- Observed rate
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Exact fields, not approximations
Every surface renders a specific sRGB value with no filter and no theming. A white screen is 255, 255, 255 in both light and dark mode.
The dim slider is the only control that changes what reaches your panel, and it says so whenever it is not at 100 per cent.
Measurements that are real
Refresh rate is the median of several hundred frame intervals, so one stall cannot drag a 144 Hz panel down to 58. Unsupported capabilities report as unknown, never as a negative.
How each measurement worksWhy DisplayProbe
Three things that are unusual about this site, all of them deliberate.
It says what it cannot do
Every tool carries a visible limitations block. A build-time scan fails the release if a forbidden claim reaches any page.
Correctness over impressiveness
Median rather than mean. A pixel-perfect test refuses to answer under fractional scaling instead of returning a confident wrong number.
Nothing to sign up for
No account and no cookies. There is no server component at all, so there is nowhere for a result to go.
How to get started
Three steps, about five minutes for a full pass over a new display.
- 01
Pick a test
The guided monitor check for a new display, or go straight to the one tool you need.
- 02
Go full screen
One click fills the screen. Arrow keys move through fields, Escape brings you back.
- 03
Judge it yourself
Each page says what a fault looks like and what is normal. Nothing is auto-detected, because nothing can be.
The tools people reach for
Eight of 26. Everything listed is finished and works.
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Monitor test
A ten-step guided inspection covering pixels, bleed, tone, motion and resolution.
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Dead pixel test
Nine exact full-screen fields, so a bad pixel has nowhere to hide.
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Black screen
Pure #000000, for bleed, glow, dust and OLED black level.
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Backlight bleed test
Black field plus the bleed, glow and clouding distinction most sites skip.
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OLED burn-in test
The fields that make retained images and uneven wear visible.
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Refresh rate test
Median-based Hz measurement, with jitter and dropped frames.
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Ghosting test
Moving objects at several speeds, for trailing and overshoot.
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Touch screen test
A grid that lights up under your finger, plus drawing and drift checks.
Screen troubleshooting guide
The four complaints that bring most people here, and what actually causes them.
A dot that will not go away
Dead, stuck or just dust?
- Wipe the screen with a dry microfibre cloth first, dust is the most common false alarm.
- Run white to find dead pixels, then black to find stuck ones.
- Run the three primaries: a failed sub-pixel hides on white and shows on its own colour.
- Stuck rather than dead? The fixer is worth twenty minutes.
Patchy light on a black screen
Bleed, glow or clouding.
- Dim the room but do not switch the lights off, darkness exaggerates everything.
- Move your head. Light that follows you is IPS glow, which is inherent, not a fault.
- Light that stays put at an edge is backlight bleed.
- Blotches in the middle are clouding, usually from pressure in the panel stack.
Blacks look grey, or shadows vanish
Usually a setting, not the panel.
- Count the near-black patches on the PLUGE ladder in a dim room.
- If everything under code 16 is invisible, you have an RGB range mismatch.
- Set your GPU, console or TV input to the same range at both ends.
- Then check brightness and contrast, in that order.
Stuck at 60 Hz, or motion stutters
Check what you are actually getting.
- Measure the observed rate, it is a median, so one stall cannot skew it.
- Reading low? Check the OS refresh rate setting and your laptop power mode.
- Check that browser hardware acceleration is on.
- High jitter with the right average is stutter, not a wrong mode.
Where to start by device
Different hardware fails in different ways. These are the checks worth your time on each.
New monitor
Pixels, bleed, uniformity and refresh rate, in that order, before the return window closes.
Phone or tablet
Burn-in and touch response. Turn off auto-brightness and warm-light mode first.
Television
Judge from the sofa. Grey fields reveal the banding that ruins panning shots.
Laptop
Panels drift warm with age and drop to 60 Hz on battery. Check plugged in and unplugged.
Gaming display
Tune overdrive against a moving object. The strongest setting is almost never the best.
Buying second-hand
No return window, so marginal results matter. Burn-in and dead pixels never improve.
What this site will not tell you
A web page cannot reach a photometer, a colorimeter or your panel's firmware, so brightness in nits, contrast ratio, colour accuracy, pixel response, panel technology, screen size, bit depth and flicker frequency never appear here as results.
What is left is enough: exact colour fields, observed refresh rate, frame pacing, gamut and HDR capability, touch behaviour, and your eyes on a clean pattern.
Read the full list of limitsScreen testing tips
Six habits that stop a healthy display from failing a test it should pass.
Let the screen warm up
Give a display ten to thirty minutes before judging colour or uniformity. Output shifts as it reaches temperature.
Turn off the enhancements
Dynamic contrast, vivid modes, motion smoothing and warm-light filters all change what you are looking at.
Use the native resolution
A scaled signal softens everything and will make a perfectly good panel look blurry.
Get the room right
Dim for black level and bleed. Normally lit for colour and uniformity. Never pitch dark, it fails healthy panels.
Judge from where you sit
Uniformity and dirty screen effect are whole-panel properties. From 30 cm away, every television looks broken.
Check the cable
A marginal HDMI or DisplayPort run can cap refresh rate, crush blacks and add banding all at once.
Frequently asked questions
Can a website detect dead pixels automatically?
No, and any site that says it can is overselling. A web page cannot read what your panel is actually emitting, because no browser API exposes that. What a test can do is fill your screen with exact, clean colour fields so a bad pixel becomes obvious to you. The looking is the part only you can do.
Do I need to install anything?
No. Every tool runs in the browser you already have, no account, no download, no extension. After your first visit the site works with no network connection at all, which helps when you are checking a screen in a shop or a storeroom.
Does anything I do here get sent anywhere?
No. There is no server that could receive it. Every test runs on your device and results are never transmitted. The only thing stored is a small preference for your theme, last-used colour and guided-check answers, all of it in your own browser. The privacy page lists exactly what that is.
How accurate are these tests?
The patterns are exact: every colour field is a specific sRGB value sent straight to your display. The measurements that exist (observed refresh rate, frame pacing, touch behaviour, gamut and HDR capability) are genuine. Everything else is your eyes on a clean pattern, and each page says which is which.
Which test should I start with?
If you have just unboxed a display, run the guided monitor test, which walks ten checks in a sensible order. If you are chasing one specific worry, go straight to the tool for it: dead pixels, backlight bleed, burn-in, refresh rate or touch response.
Why does this site keep telling me what it cannot do?
Because the alternative is lying to you. Browsers genuinely cannot measure brightness, contrast, colour accuracy or pixel response, and several popular screen-testing sites imply otherwise. Knowing which parts of a result are measured and which are your own judgement is what makes the result worth anything.
Exact patterns for every screen
New display, second-hand buy or one stubborn dot. It all runs in your browser.