Online Stopwatch & Timer
Precise stopwatch down to 1/100 second and a countdown timer with an alarm
Recorded laps
Shortcuts: Space start/stop · L lap · R reset
⏰ Time's up!
Your set time has ended.
⏱️ Stopwatch
Measure time accurately to 1/100 second. Use it to time running, sports training, presentations, cooking or any activity that needs timing. The "Lap" button records each split without stopping the clock.
⏳ Countdown timer
Set a time and let the page count down and ring an alarm when it reaches zero. Great for cooking, studying with the Pomodoro method (25 minutes), interval workouts, or break reminders. The remaining time shows right in the tab title.
Online Stopwatch and Countdown Timer
Two time tools in one page: a stopwatch counting up to 1/100 of a second with lap splits, and a countdown timer that rings when time is up.
Both are driven by real system timestamps rather than accumulated ticks, so they stay accurate even if the browser throttles a background tab.
Stopwatch
- Press "Start" or the Space bar.
- Press "Lap" (or L) to record a split without stopping.
- Press "Reset" (or R) to clear everything.
Countdown timer
- Switch to the "Countdown" tab.
- Enter hours, minutes and seconds, or pick a preset.
- Press "Start" — the ring and the tab title show the time left.
- The alarm rings until you press "Stop alarm".
FAQ
Does it keep running in a background tab? Yes, timing is based on real timestamps so the reading is correct when you return.
Can I use it for Pomodoro? Yes — use the 25 minute preset for a work session and 5 minutes for the break.