Online stopwatch
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This online stopwatch runs entirely in your browser and measures from your device clock, so it keeps counting correctly while you switch tabs, lock your phone or leave it running for hours.
Works on iPhone, Android and desktop with touch-friendly controls, keyboard shortcuts (space, L, R, F) and an offline-capable installable page.
How to use the online stopwatch
Start
Press Start or hit space. The display counts up from zero in milliseconds.
Record laps
Press Lap or L for each split. Every lap keeps its own time and running total.
Pause, reset or go fullscreen
Pause freezes the reading, Reset clears it, and F opens the large fullscreen display.
Online stopwatch features
Millisecond display
Hours, minutes, seconds and milliseconds measured from high-resolution timestamps.
Laps and splits
Unlimited laps with fastest/slowest highlighting, while running or paused.
Fullscreen mode
A large reading readable from across a classroom, gym or stage.
Phone friendly
Adaptive layout and touch controls for iPhone, Android and tablets.
Where an online stopwatch helps
Sports and workouts
Time sprints, intervals and rounds with lap splits.
Study and exams
Measure focus sessions and practice papers honestly.
Cooking and games
Time steps, turns and challenges without installing anything.
Related tools
- StopwatchStart timing in one click — milliseconds, laps and fullscreen, with nothing to install and no account to create.
- Stopwatch with lapsRecord unlimited laps with split and total times — ideal for running, intervals and experiments.
- Full screen stopwatchOne click hides everything else and shows a giant stopwatch readable from across the room.
- TimerPick a preset or type an exact duration and let the timer count down in a display you can read from across the room.
Online stopwatch questions
What is an online stopwatch?
An online stopwatch is a free stopwatch that runs in your web browser. It measures elapsed time with laps and milliseconds, with nothing to install and no account needed.
How do I use an online stopwatch?
Open this page and press Start. Use Pause to freeze the reading, Lap to record splits, Reset to clear, and the fullscreen button for a large display visible across a room.
Is an online stopwatch accurate?
Yes. This one measures time from your device clock with timestamps, not a counting interval, so it cannot drift when a tab is throttled, the screen locks or the session runs for hours.
Can I use an online stopwatch on my phone?
Yes — it works on any modern phone browser. The layout adapts to small screens and the buttons are large enough for touch.
Can I use an online stopwatch without downloading an app?
Yes. Everything runs in the browser, so there is nothing to download or update. You can also install it as a web app for offline use.
Does an online stopwatch work on iPhone?
Yes. Open this page in Safari or any iPhone browser and press Start. It supports laps, fullscreen and background-accurate timing on iOS.
Does an online stopwatch work on Android?
Yes. It works in Chrome and any modern Android browser, with the same laps, fullscreen and offline support as on desktop.
Can I use an online stopwatch with laps?
Yes — press Lap while running to record each split. Every lap keeps its own duration and running total, and the fastest and slowest laps are highlighted.
Is an online stopwatch free?
Yes, this stopwatch is completely free with no account, no limits and no watermark. Advertising keeps it free.