UUID Generator
Developer tools
Clock & Timer
Use a countdown timer, stopwatch, or local digital clock in your browser.
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How it works
Choose a mode. For a timer, enter a duration in seconds and select Start / resume. Pause freezes the remaining or elapsed time; Reset restores the timer duration or clears the stopwatch. Digital clock shows your device’s local time.
Useful notes
Elapsed time is calculated from device timestamps, so the display catches up after a background tab resumes. Browser suspension may delay the completion message. Changing your device clock can affect timing. Sessions stay in memory on this page and are not saved or uploaded.