00:0000
Laps you record will show up here.
Online Chronometer
A clean online stopwatch — start, lap and reset, accurate to a hundredth of a second. It runs entirely in your browser: nothing to install, no account, and the timer keeps correct time even if you switch tabs.
A free online chronometer, ready when you open the page
This is a full-screen online chronometer built for one job: measuring how long something takes, precisely, without getting in the way. Press start and the digits move immediately. There is no sign-up, no download and no app to keep updated — the entire stopwatch is a single web page, so the same link works on a laptop, a phone or a tablet, and it keeps working offline once the page has loaded.
People reach for a stopwatch online for very different reasons: timing intervals at the track, holding a plank, portioning a study session, checking how long a build takes, running a lab experiment, or keeping a presentation inside its slot. The chronometer treats them all the same way — a large, readable clock, three controls, and a record of every split you mark.
How to use the stopwatch
- Press Start — or tap Space — to begin timing.
- Press Lap to record a split without stopping the clock. The list marks your fastest lap in green and your slowest in red, so the session reads at a glance.
- Press Stop to pause and Resume to continue from the same reading — pausing never loses the time already banked.
- Use Export to download your laps as CSV for Excel or Google Sheets, as TSV, or as JSON.
- Reset appears once the chronometer is stopped, and asks first so a full session is never lost by accident.
What this online timer gives you
- Hundredth-of-a-second precision read from the browser's high-resolution clock.
- A lap timer that records splits and marks the fastest and slowest of them.
- Renameable rows — count laps, sets, reps, rounds or strokes, whatever you are actually measuring.
- Keyboard shortcuts for start, stop, lap and reset, so a desk session never needs the mouse.
- Export to CSV, TSV or JSON when the numbers need to leave the page.
- Light and dark, with the type size, corner style and accent colour following the site's appearance settings.
Chronometer or stopwatch?
In everyday use the two words mean the same thing: a device that measures elapsed time from zero. Strictly, a chronometer is a timekeeping instrument certified for accuracy, while a stopwatch is a handheld timer you start and stop. Search for an online chronometer, a digital stopwatch or a lap timer and you are looking for this page either way.
Frequently asked questions
- What is an online chronometer?
- An online chronometer is a stopwatch that runs in your browser. You open the page and start timing — there is nothing to install, and it works the same on a phone, a tablet or a desktop.
- How accurate is this stopwatch?
- It reads the browser's high-resolution clock and displays hundredths of a second. Because every reading is derived from real timestamps rather than counted frames, the elapsed time stays correct even if the page is busy or the tab goes to the background.
- How do I use the lap timer?
- Press Lap while the chronometer is running to record a split. Every lap is listed with its own time, and the fastest and slowest laps of the session are highlighted so you can compare them at a glance.
- Are there keyboard shortcuts?
- Yes. Space starts and stops the online stopwatch, L records a lap, and R resets everything back to zero.
- Does the chronometer keep running if I switch tabs?
- Yes. The timer is based on the clock, not on the page being visible, so switching tabs or locking your phone does not lose time — the correct reading appears as soon as you come back.
- Is it free?
- Completely. The online chronometer is free to use, needs no account, and stores nothing about you.