Double-Click Test.
Check your mouse for unintended double-clicking — a common hardware fault where one physical click fires twice. Nothing is uploaded; everything runs in your browser.
Left-click steadily inside the pad below with your mouse, at whatever pace feels natural. If a single physical click ever registers as two, the gap between clicks gets flagged in red.
Sensitivity threshold
A click that lands faster than this after the previous one is flagged as an unintended double-click. 70 ms suits most mice — lower it if you're getting false positives from genuinely fast clicking, or raise it if a known-bad mouse isn't triggering flags.
Live results
Click the pad to start testing.
Recent click gaps
No clicks yet — start clicking to see gaps here.
Reading the gap
Before you start
- Use the actual mouseTest with the exact mouse you suspect is faulty, connected directly rather than through a USB hub or KVM switch that could add its own noise.
- Click at a normal paceClick the way you normally would — don't deliberately click as fast as possible. You're checking for accidental double-clicks, not testing your click speed.
- Do more than a few clicksA single clean pass doesn't rule out an intermittent fault. Aim for 20–30 clicks, including a mix of slow and slightly quicker ones, to catch a switch that only misbehaves occasionally.
- Repeat over a few sessionsSwitch chatter often gets worse with time or temperature. If today's test comes back clean but you still see phantom double-clicks in daily use, retest again in a day or two.
How to test for double-clicking
- 1Pick a thresholdLeave the sensitivity at 70 ms to start — fast enough to catch a bouncing switch, slow enough to ignore real double-clicks.
- 2Click steadilyLeft-click inside the pad repeatedly at your normal speed for at least 20–30 clicks.
- 3Watch the flagsAny click that lands faster than your threshold after the one before it turns red in the log and counts as an unintended double-click.
- 4Read the verdictAfter a good sample of clicks, check the verdict line — zero flagged events across dozens of clicks is what a healthy mouse switch looks like.
Why do mice double-click by themselves?
Inside every mouse button is a tiny mechanical switch. When the metal contacts inside it snap together, they can physically bounce apart and together again for a fraction of a millisecond before settling — a phenomenon called switch bounce or chatter. A healthy switch's firmware debounces this instantly, so your computer only ever sees one clean click. As the switch wears out (often after tens of millions of clicks, or sooner on cheaper mice), the contacts pit and oxidize, the bounce lasts longer, and the debounce logic starts letting a second click through — so one press of your finger registers as two in software, exactly like this test measures.
This shows up as maddening real-world symptoms: single-clicking a file opens it twice, dragging a slider or selecting text jumps unexpectedly, and in games a single shot or placement fires twice. Because it's a hardware issue, no driver update or OS setting fixes it permanently — some mice let you raise the OS "double-click speed" setting or install a debounce utility as a band-aid, but the only real fix is replacing the micro switch (easy on hot-swappable mice) or the mouse itself. Running this test with a normal clicking pace, several times, is the most reliable way to confirm the fault before you take that step.
When this test helps
Diagnosing phantom double-clicks
You single-click a file, link, or in-game target and it fires twice — this test tells you whether the mouse itself is to blame.
Buying a used mouse
Double-click chatter is one of the most common faults in second-hand mice and is easy to miss with a quick try before you buy.
Backing up a warranty claim
Capture concrete numbers — flagged event count and fastest gap — to support a return, repair, or warranty request.
Double-click terms
- Switch bounce (chatter)
- The rapid, unintended on/off bouncing of a mechanical switch's contacts as they physically strike together, before settling into a single steady state.
- Debounce
- Firmware logic that filters out switch bounce so a single physical press is reported as exactly one click. Fails as a switch wears out.
- Micro switch
- The small mechanical switch under each mouse button that registers your click — the part that wears out and causes double-click faults.
- Double-click speed
- An operating-system setting for how close together two clicks must land to count as one "double-click" gesture — unrelated to hardware chatter.
- False positive
- A flagged event that wasn't actually a hardware fault — for example, a threshold set too high for your natural clicking speed.
- Click gap
- The time between one click's mousedown event and the next, measured in milliseconds — the core number this test tracks.
Frequently Asked Questions
What is a double-click test?
A double-click test measures the time between consecutive clicks on your mouse and flags any pair that lands closer together than a chosen threshold (commonly 50–100 ms). Because a genuine, deliberate double-click from a human hand is rarely faster than 100–120 ms, an unusually fast pair almost always means the mouse's switch registered one physical press as two — a classic sign of "mouse chatter" or a worn switch, not something you did wrong.
What causes a mouse to double-click on its own?
The most common cause is a worn or dirty micro switch inside the mouse button. As the metal contacts age, they bounce open and closed for longer when pressed, and eventually the mouse's debounce circuitry can't filter that bounce out, so it reports two clicks for one press. Dust, moisture, or a manufacturing defect can also cause it, sometimes from day one on a cheap mouse.
What's a normal gap between two intentional clicks?
Most people's fastest deliberate double-clicks land around 150–300 ms apart, and the operating system's own double-click detection window is usually configured around 300–500 ms. Anything consistently registering under 50–70 ms without you trying to click that fast is well outside normal human clicking speed and points to a hardware fault rather than a fast finger.
How do I fix a mouse that double-clicks?
There's no permanent software fix for a worn switch, but a few things help: clean around the button with compressed air or a contact cleaner (dust can sometimes cause the same symptom), and confirm the diagnosis first with a test like this one. Some mice let you replace the individual micro switch cheaply if the shell is hot-swappable. Otherwise, the fix is a replacement mouse or a warranty claim — this test gives you the numbers (flagged count, fastest gap) to support that claim.
Why does it flag double-clicks even though I clicked normally?
If you're getting flags at the default 70 ms threshold during completely normal clicking, that's the test doing its job — a healthy mouse essentially never produces sub-70ms gaps from a single deliberate click. If you suspect the threshold is too aggressive for your natural clicking speed, try the 50 ms setting and see if the flags disappear; if they persist even at 50 ms, the mouse is very likely faulty.
Does this work with a trackpad or touchscreen?
This test listens for mouse button clicks, so it works with any device that sends real mouse click events, including many external trackpads. It's not meaningful on touchscreens or laptop trackpads using tap-to-click gestures, since those don't have a mechanical switch to chatter — this tool is specifically for diagnosing a physical mouse-button fault.