Stopwatch
Simple online stopwatch.
Simple online stopwatch.
How to use Stopwatch
- Press start to time in hours, minutes, seconds, and centiseconds
- Record laps to capture splits without stopping the clock
- Stop to pause, resume to continue, or reset to clear
About Stopwatch
A precise, no-frills online stopwatch that starts the instant the page loads — no download, no sign-up, no waiting. Press Start to begin timing, Stop to pause, and Resume to pick up exactly where you left off, then Reset to clear the clock. The display counts up in hours, minutes, seconds, and hundredths of a second, redrawn smoothly so you can read fast splits without the numbers blurring.
Tap Lap to mark a split while the clock keeps running. Every lap records both its own interval and the running total, and the fastest and slowest laps are highlighted so you can compare rounds at a glance — handy for interval workouts, timing laps at the track, cooking steps, study or Pomodoro sessions, and speed drills. Because the elapsed time is worked out from timestamps rather than a ticking counter, switching tabs or locking your screen won't throw the total off; the time is still right when you come back.
This is a count-up stopwatch, so it measures how much time has passed rather than counting down to zero — if you need a countdown you'd reach for a separate timer. Everything runs entirely in your browser using your device's high-resolution clock, so no timing data is ever uploaded, tracked, or stored on a server. Your sessions stay private on your own machine, and the tool works the same on a phone, tablet, or desktop.
Frequently asked questions
- Is this stopwatch free to use?
- Yes, it is 100% free with no sign-up, no account, and no limits. You can start, stop, lap, and reset as many times as you like at no cost.
- Is my data uploaded or stored anywhere?
- No. The stopwatch runs entirely in your browser using your device's clock. No timing data is uploaded, tracked, or saved to any server, so your sessions stay completely private.
- How accurate is the timer?
- It uses the browser's high-resolution performance.now() clock and redraws with requestAnimationFrame, so the elapsed time is measured precisely and stays free of the drift that plain interval timers accumulate.
- What does the lap feature do?
- Lap records a marker while the clock keeps running. Each lap shows its own split (the time since the previous lap) and the cumulative total, and it highlights your fastest and slowest laps for easy comparison.
- Can I pause and resume the stopwatch?
- Yes. Press Stop to pause the clock without losing your time, then press Resume to continue counting from where you left off. Reset clears the elapsed time and all laps.
- Does it keep running if I switch tabs?
- The elapsed time is calculated from timestamps, so when you return to the tab the time shown is still correct. Some browsers throttle background tabs, which can slow the on-screen refresh, but the measured total stays accurate.
- Can I use this as an online timer or clock?
- This is a live stopwatch: it counts up from zero and shows the elapsed time as it passes, which covers most cases where you just want to measure how long something takes. It isn't a wall clock or a scheduled alarm, so it won't display the current time of day or ring at a set moment — it simply tracks time from when you press Start.
- Can I use it as a countdown timer?
- No — this stopwatch counts up rather than down, so it measures elapsed time instead of counting toward zero. If you specifically need a countdown that ends at 00:00, such as for a workout round or a cooking timer, you'd want a dedicated countdown timer. For anything where you're tracking how much time has gone by, the stopwatch is the right tool.
- Can I use this as a chess clock or chess stopwatch?
- It's a single count-up stopwatch, not a two-sided chess clock that alternates between players and counts each side's time down. You can still use it to time a whole game or one player's total thinking time, but it won't switch turns or enforce a per-player limit on its own.
- Does it come with a random name picker?
- No, this page is only a stopwatch — it doesn't pick random names or spin a wheel. That search usually comes from sites that bundle several classroom gadgets together; here the focus is a fast, accurate stopwatch and nothing else.
- Does it show milliseconds or hundredths of a second?
- Yes. The clock displays hundredths of a second (centiseconds) alongside hours, minutes, and seconds, so you can read splits down to 0.01s. That's precise enough for sprints, lap times, and reaction drills where fractions of a second matter.
- Does it work on a phone or tablet?
- Yes. It runs in any modern mobile or desktop browser, so it works the same on a phone, tablet, or computer with no app to install. The layout scales to your screen, and because it uses your device's own clock it stays accurate wherever you open it.