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White Screen
Fills your entire screen with solid white. Cleaning the screen, spotting dust and dark…
Gamma Test
A step-and-stripe pattern that lets you read your display's gamma by eye and check it against the 2.2 standard.
Screen Tests
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Free, unlimited
The test starts automatically — follow the prompts above.
In short
Gamma describes how the display maps input signal to actual brightness, and getting it wrong makes every photograph and video you view slightly wrong in a way that is hard to name. Aim for 2.2 for general use, web work and sRGB content; 2.4 is the standard for film viewed in a dark room. Anything far from 2.2 will make images look either washed out or too contrasty compared with how they were graded. The test reads gamma by eye using a step-and-stripe pattern where alternating one-pixel lines blur into an even tone at the right distance — which is why it asks you to step back. Up close your eye resolves the individual lines and the illusion breaks entirely, so a reading taken with your face near the screen is meaningless. Browser zoom must be at 100% for the same reason, since scaling destroys the one-pixel stripes the pattern depends on. If the reading is far off, the fix is usually in the monitor's own menu or a display calibration profile rather than in the graphics driver.
How to use the Gamma Test
- The test starts on its own — no button to press and nothing to install.
- Follow the prompt in the test panel and watch the readings update live.
- Press Reset to start over with a clean slate.
About the Gamma Test
The Gamma Test a step-and-stripe pattern that lets you read your display's gamma by eye and check it against the 2.2 standard. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Checking gamma before calibrating a monitor.
- Diagnosing images that look too flat or too contrasty.
Where this tool stops
A visual estimate. Accurate gamma measurement needs a hardware colorimeter such as a SpyderX or i1Display.
Frequently asked questions
What gamma should I aim for?
2.2 for general use, web work and sRGB content. 2.4 is the standard for film viewed in a dark room. Anything far from 2.2 will make photographs and video look wrong.
The test needs me to step back. Why?
The pattern relies on 1-pixel stripes blurring together into an even tone. Up close your eye resolves the individual lines and the illusion breaks. Browser zoom must also be at 100%, or the stripes are resampled and the result is meaningless.
Is the Gamma Test free?
It is free, with no account, no trial and no daily cap. Every screen tests tool on inputtesthub.com works the same way: open the page and use it.
Is what I paste into the Gamma Test stored?
No. The Gamma Test runs entirely in your browser using JavaScript. Because the work happens locally, the utility also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
When would I actually need the Gamma Test?
The most common reasons people reach for it: checking gamma before calibrating a monitor. Diagnosing images that look too flat or too contrasty. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there anything the Gamma Test cannot do?
A visual estimate. Accurate gamma measurement needs a hardware colorimeter such as a SpyderX or i1Display. Knowing where a tool stops being trustworthy matters more than the cases where it works.
Do I need to install anything to run this test?
No installation, no extension and no driver. The Gamma Test uses the browser's own device APIs and begins as soon as the page loads, so there is nothing to press first. Press Reset at any point to start over with a clean slate.
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