Countdown / Stopwatch - Online Timer
Free countdown and stopwatch. Time locally in your browser, with custom duration and start/pause/reset. Works offline. 100% local.
About 效率工具
Local countdown & stopwatch with custom duration and controls. This tool runs entirely in your browser locally — no file upload, your privacy is protected, and speed is unaffected by network.
FAQ
Will my files be uploaded?
No. All processing happens locally in your browser; files never leave your device.
Which formats / scenarios are supported?
countdown, stopwatch, timer, online timer, pomodoro, timer and more can be done on this page.
Do I need an internet connection?
After the page loads, conversion/computation runs locally and works offline (except features relying on external fonts/libraries).