Online Stopwatch
Last updated: June 15, 2026Start, stop and lap — in your browser.
Online Stopwatch is a free online tool to start, stop and lap — in your browser. It runs entirely in your browser, so your files never leave your device — nothing is uploaded. There's no sign-up, no watermark, and it works on any modern browser on desktop or mobile.
How to use Online Stopwatch
The Online Stopwatch times anything to the hundredth of a second, with start, pause, lap and reset — no app to install. It runs entirely in your browser and keeps counting accurately even if the tab is busy. Free, no sign-up.
Read the full guide: How to Use an Online Stopwatch with Laps (Free)
- 1Press Start to begin timing.
- 2Tap Lap to record split times.
- 3Pause or Reset whenever you need.
Lap times
Record splits without stopping the clock.
Accurate
Times to 1/100th of a second using your device clock.
Free & instant
No app, no sign-up — just open and start.
Timing track and swim repeats
Running 400m intervals or swimming laps in the pool? Tap Lap at the end of each rep to capture its split without stopping the clock, so you can compare set after set. Each split shows the total elapsed time to the hundredth of a second, and the newest lap sits at the top of the list for a quick glance between efforts.
Measuring code or script runtime
Need a rough wall-clock figure for how long a build, query, deploy, or manual test takes? Hit Start when you kick it off and Pause when it finishes for a reading accurate to 1/100th of a second. Because it counts real elapsed time from your device clock, the number stays right even while the tab sits in the background behind your terminal.
Timing speeches and presentations
Rehearsing a talk against a strict slot? Start the stopwatch as you begin and drop a Lap at the end of each section to see where the minutes go. The large monospace readout is easy to glance at from across the room, and Reset clears both the clock and every split so each practice run starts clean.
Online Stopwatch — frequently asked questions
Does the stopwatch keep running if I switch tabs?
Yes — it tracks real elapsed time from your device clock, so it stays accurate even if the tab is in the background.
Can I record lap times?
Yes, tap Lap while running to capture as many splits as you like.
Is it free?
Yes, completely free with no sign-up.
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