Start, pause, lap, and reset a precise browser stopwatch.
Countdown Timer
Run a configurable countdown with a visible completion alert.
client processing
How to use Countdown Timer
Enter or choose your values, run the tool, and copy or download the result where available. Reset starts a clean calculation.
Private browser processing
This utility runs in your browser. Toolbox does not send its inputs to the server. Saved state is used only where the tool clearly says so.
Related tools
Run configurable focus and break sessions in your browser.
Measure typing speed and accuracy in a timed local test.
Keep a persistent browser-local task list with completion states.