Online Stopwatch & Countdown Timer
A stopwatch with lap times and a countdown timer with an alarm beep — works offline in your browser.
Calculator
How to use
- 1
Choose Stopwatch or Timer.
- 2
Stopwatch: press Start, then Lap to record splits. Timer: set the time or pick a preset and press Start.
- 3
When the timer reaches zero, it beeps — keep your volume on.
Questions
Does it keep running in the background?
Yes. Time is measured from your device clock, so it stays accurate even if you switch tabs. Browsers may delay the alarm beep slightly in a background tab.
Why can't I hear the alarm?
Check that your device isn't on silent and the volume is up. Browsers only allow sound after you tap a button on the page, which Start does.
Is my data saved?
No. Laps and timers live only in this page and are cleared when you close or reload it.
About this Stopwatch tool
Online Stopwatch & Countdown Timer — A stopwatch with lap times and a countdown timer with an alarm beep — works offline in your browser. It is one of 200 free tools on namasivayam.in, made by software engineer Namasivayam Vadivelan for everyday use in India.
Everything is calculated instantly in your browser: nothing you type or upload is sent to any server, there is no sign-up, and it works on mobile and desktop. Choose Stopwatch or Timer.
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Results are estimates to help you plan. They are not financial, tax or medical advice.