Stopwatch

Run a local browser stopwatch with start, pause, resume, lap tracking, copy support, and CSV export for lap records.

Online Stopwatch

An online stopwatch with start, pause, resume, lap tracking, copy support, and CSV export for workouts, classes, races, and productivity sessions.

How to use

  1. Press start to launch the stopwatch.
  2. Use lap to record split and total times during the run.
  3. Pause when needed and resume later.
  4. Copy the current display or export lap records as CSV when finished.

Features

  • Runs fully locally with no time data upload
  • Tracks laps, fastest lap, slowest lap, and total elapsed time
  • Supports copying the current time and exporting lap CSV

Why use this?

  • Useful for workouts, classes, rehearsals, races, and focused work blocks
  • Better than manual note-taking when you want repeatable lap tracking and performance review
  • Starts instantly in the browser with fast feedback and no setup

Related Tools

Timer

A stopwatch and countdown timer with laps, custom durations, and audio reminders.

Time Zone Converter

Convert date-times between two time zones locally in your browser with DST-aware offsets and ISO / UTC / Unix details.

Time Diff Calculator

Calculate the difference between two date-time values locally in your browser, including signed duration, ISO duration, and total-unit outputs.

Duration Calculator

Add or subtract a duration from a base date-time locally in your browser with ISO Duration, local time, and Unix outputs.

Business Days Calculator

Count business days between two dates locally in your browser and calculate business-day offsets with custom weekends and holiday exclusions.

Cron Expression Generator

Generate Cron expressions locally in your browser with field-based controls, presets, human-readable descriptions, and upcoming run previews.

Cron Expression Parser

Parse Cron expressions locally in your browser and inspect the natural-language explanation, field breakdown, and upcoming run times.

iCal Event Generator

Generate standard .ics calendar events locally in your browser with time zones, all-day support, alarms, and recurrence rules.

Random Number Generator

Generate random numbers locally in your browser with custom ranges, counts, decimal places, rolling mode, no-repeat draws, and history.

Timestamp Converter

Convert Unix timestamp to/from human readable date.

Crontab Expression Translator

Translate Cron expressions into readable words and calculate execution times.