Stopwatch
Start, stop, reset, and record laps — millisecond precision, all in your browser.
00:00.00
About this stopwatch
This browser-based stopwatch uses requestAnimationFrame for smooth millisecond-precision display. Lap times show both the split (time since last lap) and cumulative total. The stopwatch runs entirely in your browser — no data is sent anywhere, and it works offline. Reloading the page resets the timer.
Private & free — this tool runs entirely in your browser.
Recommended: IndieKit — Ship your Next.js startup in days.affiliate
Related Developer Utilities tools
RegExp Tester
Test regular expressions and inspect matches locally.
Regex Visualizer
Visual regex pattern diagram with live match highlighting and capture group annotations.
Subnet Calculator
Compute CIDR subnets, usable hosts, and network ranges.
Cron Parser
Translate cron syntax into plain English.
URL Parser
Break a URL into protocol, host, path, and query parts.
HTML Previewer
Paste HTML and see it rendered live in a safe, sandboxed preview.
HTTP Status Code Reference
Search and look up every HTTP status code and its meaning.
MIME Type Lookup
Find the MIME type for a file extension, or the extensions for a MIME type.