Online Stopwatch & Timer
A free online stopwatch with lap times and a countdown timer that beeps and flashes the tab title when time is up. Keeps accurate time even in a background tab. Works on phone and desktop.
00:00.00
| Lap | Lap time | Total |
|---|
05:00
⏰ Time’s up!
Set a time first.
How it works
- Choose Stopwatch or Timer at the top.
- Stopwatch: press Start, then Lap to record split times. Timer: set hours, minutes and seconds or tap a preset.
- When the timer ends you’ll hear a beep and the tab title flashes. Press Stop alarm to silence it.
FAQ
Does it keep running if I switch tabs?
Yes. Time is measured from your device clock, so it stays accurate in the background. The remaining time also shows in the tab title.
Why didn’t I hear the alarm?
Check that your device isn’t muted. On phones, keep the screen on and the page open, since browsers may pause sound on locked screens.
How precise is the stopwatch?
It shows hundredths of a second and uses the browser’s high-resolution clock. It’s great for workouts, cooking and study sessions.