Web Stopwatch — High-Precision Timer

Engineer-friendly web timer with stopwatch, countdown, and world clock. Features millisecond precision, lap times with fastest/slowest highlighting, JSON export, keyboard shortcuts, and terminal-style UI.

Key Features:

Stopwatch (lap times, fastest/slowest auto-highlight)
Countdown (5/10/15/25min presets + custom)
World Clock (UTC, Unix timestamp, ISO 8601)
JSON Export (auto-copy to clipboard)
Keyboard shortcuts (Space/L/R/E/1-3)

⚠ DISCLAIMER

This Web Stopwatch depends on the browser's JavaScript runtime. Please note the following:

Millisecond accuracy is not guaranteed. Errors may occur depending on browser or device load.
When in a background tab, browser power-saving may make timing inaccurate.
Do not use for critical timing (sports competitions, medical use, legally binding records, etc.).
The developer assumes no liability whatsoever for any damages arising from use of this tool.
Exported JSON is informational only and cannot be used as an official record.

This web stopwatch depends on browser JavaScript execution and is provided "as is" without warranty of any kind. Do not use for critical timing applications.