The Most Complete Free Online Stopwatch Available
I tested every major online stopwatch website before building this one. Most of them get the basics right, a start button, a pause button, maybe a lap feature, but almost none combine accuracy, lap comparison, data export, keyboard shortcuts, and multiple simultaneous stopwatches into a single tool. This stopwatch brings all of that together in one clean interface.
True Millisecond Precision That Never Drifts
A common problem with poorly built browser stopwatches is timing drift. If a stopwatch relies on a simple repeating interval to update its display, browser tab throttling can cause the displayed time to fall behind the actual elapsed time, especially if you switch to another tab while it runs. This stopwatch uses the browser's high-resolution performance timing API to calculate elapsed time from an absolute start point every single update, which means the displayed time stays accurate down to the millisecond even if the tab is inactive for a while.
Unlimited Laps with Automatic Fastest and Slowest Detection
Every lap you record is automatically compared against every other lap in the session. The fastest lap is highlighted in green and the slowest in red, so you can instantly see your most and least consistent intervals without doing any math yourself. This is incredibly useful for runners checking their pacing, swimmers comparing pool lengths, or anyone running repeated timed trials who wants to see patterns at a glance.
Export Your Data to CSV or Clipboard
Once you are done with a timing session, you do not have to manually copy down every lap time. Click the Export CSV button and a spreadsheet-ready file downloads straight to your device, ready to open in Excel, Google Sheets, or any other analysis tool. Alternatively, the Copy Laps button puts all lap data on your clipboard in a clean tab-separated format you can paste directly into a document or training journal.
Multiple Stopwatches Running at the Same Time
Most competitor stopwatch tools only let you run one timer at a time. This tool lets you add as many additional stopwatches as you need, each running completely independently. This is useful for coaches timing several athletes at once, cooks tracking multiple dishes with different cook times, or anyone juggling several timed tasks simultaneously.
Keyboard Shortcuts for Hands-Free Operation
When your attention is on the activity you are timing rather than your screen, reaching for a mouse to click buttons is slow and distracting. This stopwatch supports full keyboard control: press Space to start or pause, L to record a lap, R to reset once stopped, and F to toggle fullscreen. This lets you operate the entire stopwatch without ever touching your mouse, which is especially useful during workouts, experiments, or any activity where your hands or eyes are occupied elsewhere.
Fullscreen Mode That Keeps Your Screen Awake
For long timing sessions, the last thing you want is your device going to sleep and losing track of where you are. This stopwatch includes a screen wake lock option that, when enabled, actively prevents your device's screen from dimming or sleeping while the stopwatch is running, combined with a true fullscreen mode that displays the giant timer clearly from across a room.
Common Uses for This Stopwatch
Runners and athletes use it to track split times for laps, intervals, and sprint drills. Swimmers time their pool laps and compare stroke-to-stroke consistency. Cooks track cook times for multiple dishes simultaneously using the multiple stopwatch feature. Students pace themselves through timed exam sections. Science teachers and lab assistants time reactions and experiments with precision. Speedrunners track individual segment times during attempts. Whatever you are timing, this stopwatch handles it with the accuracy and features a professional tool should have, completely free.