Mouse Tester
Click any mouse button to test it. Side buttons, scroll wheel and middle click are all detected in real time. No download needed.
What the Mouse Tester Checks
This free online mouse tester detects every button on your mouse in real time. Click any button and it lights up instantly on screen. Left click, right click, middle click, back button, forward button, and scroll wheel all register separately. There is nothing to install and nothing to configure. Open the page, click your buttons, and the tool tells you immediately which ones are working and which are not.
The mouse tester is useful in three common situations. First, when you have just bought a new mouse and want to confirm every button works out of the box before the return window closes. Second, when an existing mouse starts behaving strangely and you want to isolate exactly which button is causing the problem. Third, when side buttons stop responding in games or browsers and you need to know whether the issue is hardware or software.
This tool tests physical button registration only. It confirms that your mouse is sending the correct signal to your computer when each button is pressed. It does not measure click speed, accuracy, or sensor performance. Those require separate tools which we cover further down.
How to Use It
Open the mouse tester and click each button one at a time. The visual display shows your mouse with each button highlighted as it is pressed. Work through every button systematically. Start with left click, right click, then middle click by pressing down the scroll wheel, then the back and forward side buttons if your mouse has them. Finally scroll the wheel both up and down to confirm it registers in both directions.
If a button does not light up when pressed, press it several more times to rule out a missed click. If it consistently fails to register, the button is either physically faulty, the switch has degraded, or the button requires driver software to be recognised by the browser.
For a complete picture of your mouse health, run the button test first, then check your mouse polling rate to confirm it is reporting at 1000Hz, and run the scroll wheel test to check scroll consistency and smoothness.
Button Problems the Tester Reveals
The most common mouse hardware problem is double clicking from a single press. This happens when the microswitch inside a button wears out and the internal spring loses tension, causing it to briefly bounce and register two clicks instead of one. In everyday use this causes accidental double-opening of files, accidental double-firing in games, and erratic text selection. The double click test measures exactly how often this is happening and how fast the double triggers are occurring.
Ghost clicking is another common issue where the button registers a click without being pressed, or holds down without being held. This shows up clearly in the mouse tester as a button lighting up on its own. Ghost clicking is almost always a sign of a failing switch or debris caught under the button.
Side buttons that fail the tester entirely are often a software issue rather than hardware. Many gaming mice require their companion software to be installed for side buttons to function correctly, or the buttons may be mapped to functions that browsers intercept before they reach the test. If your side buttons work in games but not in the tester, that is the likely explanation.
Scroll Wheel, Side Buttons and Middle Click
The scroll wheel has two testable functions, scrolling and clicking. Scrolling up and down should register separately in the tester and feel consistent with no skipping or stuttering. A scroll wheel that skips steps or scrolls in the wrong direction has a worn encoder, which is a common issue on mice after heavy use. The dedicated scroll test gives you a more thorough analysis of scroll consistency than the basic tester.
Middle click is activated by pressing down on the scroll wheel. It is one of the most underused buttons on a mouse and also one of the first to develop faults. In browsers it opens links in new tabs. In games it often binds to important actions. If middle click fails the tester, the scroll wheel mechanism may need cleaning or the switch beneath it may have failed.
Side buttons, also called thumb buttons or mouse buttons 4 and 5, are used for browser navigation and frequently bound to in-game actions in shooters and games like Minecraft. If your side buttons are not registering in the tester, check your mouse software first before assuming a hardware fault.
Is Your Mouse Performing Well in Games?
Knowing your buttons register is just the first layer of mouse health. For competitive gaming, several other factors determine whether your mouse is performing at its best.
Click speed is how quickly you can register repeated clicks. Your CPS test measures this directly and is particularly relevant for Minecraft PvP, where your clicks per second in combat directly determines your hit rate. Servers like Hypixel use 1.8 combat mechanics where high CPS gives a direct advantage. Most competitive players aim for 8 to 12 CPS on a 10 second test.
Polling rate is how frequently your mouse reports its position and button state to your computer. A mouse running at 125Hz reports 125 times per second, meaning up to 8ms of input delay. A mouse at 1000Hz reports every 1ms. For competitive play this difference is meaningful. Use the polling rate checker to confirm your mouse is running at its rated Hz.
DPI and sensitivity affect how precisely your cursor tracks movement. If your mouse feels inconsistent or your aim feels off, use the DPI calculator to find your true DPI and the sensitivity converter to match your settings across games.
Aim accuracy can be trained and measured with the mouse accuracy test, which tracks how precisely you hit moving targets over a timed session.
When Your Mouse Fails the Test
If a button consistently fails to register, you have a few options depending on the mouse type.
For mechanical and gaming mice with replaceable switches, the faulty microswitch can often be replaced for a few dollars. Omron switches and Kailh switches are the most common replacements and significantly extend a mouse life. This is worth doing for quality gaming mice where the body and sensor are still in good condition.
For standard office mice or lower-end peripherals, replacement is usually more practical than repair. A mouse that double clicks or ghost clicks will cause problems in every application and the fix is rarely permanent on budget hardware.
Before assuming hardware failure, check a few software causes. Reinstalling the mouse driver, testing the mouse on a different USB port or computer, and checking the mouse software for conflicting button mappings can all resolve issues that appear to be hardware problems in the tester.
If your mouse passes the button test but still feels off in games, the issue is likely performance rather than hardware failure. That points to polling rate, DPI configuration, or mouse acceleration settings. Our mouse acceleration tool helps you check and adjust acceleration settings that can make aim feel inconsistent even with a perfectly functioning mouse.
Frequently Asked Questions
How do I test if my mouse buttons are working?
Use this free online mouse tester. Click each button and watch for it to highlight on the display. Any button that does not light up is not registering and may need repair or a driver check.
Why is my middle mouse button not working in the tester?
Middle click is activated by pressing down on the scroll wheel. If it does not register, try pressing it more firmly. If it consistently fails, the switch beneath the scroll wheel may be worn. Also check that your mouse driver software does not have middle click remapped or disabled.
My side buttons work in games but not in the mouse tester. Why?
Browsers intercept certain mouse inputs before they reach the page. Mouse button 4, the back button, is often captured by browser navigation. Try disabling browser navigation shortcuts or testing in a different browser. If side buttons fail everywhere including games, check your mouse software.
Can I test a wireless mouse with this tool?
Yes. The mouse tester works with wired and wireless mice equally. If your wireless mouse shows inconsistent or missed button registrations in the tester, it may indicate a connectivity issue, low battery, or interference. Try moving the USB receiver closer to the mouse or replacing the battery.
What is the difference between the mouse tester and the double click test?
The mouse tester confirms whether each button registers a signal at all. The double click test specifically measures whether a single press is registering as two clicks, which is the most common sign of a worn switch. Run both for a complete picture of your left button health.
My mouse passes the tester but still feels wrong in games. What should I check?
A passing tester means your buttons register correctly but does not cover performance issues. Check your polling rate with the polling rate checker, test your aim consistency with the accuracy test, and verify your DPI with the DPI calculator.