Stopwatch Online Timer Countdown Pomodoro

Online Stopwatch

Run a stopwatch without logging in. Tap to start, lap, and stop. No account, no app - works right in your browser.

00:00:00.00
Hours : Minutes : Seconds . Centiseconds
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Step-by-Step Guide

Stopwatch

Track absolute elapsed times, record dynamic lap markers, and measure performance intervals instantly.

1
Trigger Chronometer

Click Start or hit Spacebar to start the millisecond stopwatch counting loop.

Start/Stop Trigger Key Bindings
2
Record Lap Markers

Press Lap while the clock is running to log precise split durations without halting the counter.

Lap Splits Interval Delta
3
Pause & Resume

Pause the countdown when necessary to trace specific times, resuming standard counting smoothly.

Pause State Timer Interrupts
4
Save or Reset Log

Reset the stopwatch back to zero and export the recorded lap sheet array to your local clipboard.

Reset Display Lap Log Export
Client-side processing
Auto-deleted after session
Zero server uploads
Time Utility

High-precision millisecond browser stopwatch

Measure track durations, count intervals, and export lap metrics offline inside your browser.

Millisecond Precision

Uses high-resolution browser timing loops to measure splits down to hundredths of a second.

Infinite Lap Logging

Records and displays an unlimited list of lap intervals, detailing individual lap time and total elapsed time.

Keyboard Hotkeys

Maps simple keyboard controls (Spacebar for Start/Stop, 'L' for Lap, 'R' for Reset) for hands-free tracking.

Background Execution

Leverages Web Workers to keep the stopwatch running accurately even if the browser tab is minimized.

Measure elapsed time down to milliseconds
Record unlimited laps with split comparisons
100% client-side script runs completely offline
FAQ

Common Questions

Frequently asked questions regarding chronometer precision, keyboard layouts, and browser workers.

How accurate is this browser stopwatch?
The stopwatch is highly accurate, utilizing JavaScript's high-resolution timestamp API (performance.now()) which provides sub-millisecond precision, far exceeding standard clock timers.
Will the stopwatch stop if I switch browser tabs?
No. The stopwatch utilizes background execution scripts (Web Workers) to ensure timekeeping loops execute continuously, even if you navigate away or minimize the active tab.
What is the difference between split time and lap time?
Lap time measures the duration of a single interval (e.g. one lap around a track). Split time measures the total cumulative elapsed time from the start of the stopwatch to that specific marker.
Can I export my recorded lap times?
Yes. You can copy the entire formatted table of lap splits and elapsed times directly to your clipboard to paste into spreadsheets or notes.
Is my timing data sent to any servers?
No. The stopwatch runs 100% locally in your web browser. No timing records, laps, or sessions are uploaded or stored on our servers.