Date & Time Tools
Stopwatch & Timer
A precise browser stopwatch and countdown timer with lap support.
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What is Stopwatch?
A pair of timing tools: a start/stop/reset stopwatch with lap recording, and a countdown timer for a set number of minutes and seconds.
How it works
Elapsed time is computed from performance.now() deltas rather than accumulated ticks, so it stays accurate even if the tab is throttled.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Realistic sample
Paste or type any realistic input — the tool computes the result locally and instantly.
Common mistakes
Expecting a server round-trip
Nothing is uploaded — every tool in this category runs entirely in your browser.