Countdown Timer
Type hours, minutes, and seconds. Enjoy a smooth countdown with live milliseconds.
Shortcuts: Space Start/Pause • R Reset. Inputs lock while running to prevent accidental edits.
About this Countdown
This free countdown timer runs entirely in your browser and uses the high-resolution
performance.now() clock for smooth, accurate timing. Enter the hours, minutes, and seconds you
need and press Start. The main display shows hours, minutes, and seconds with a live millisecond
readout so you can see precisely how much time remains. You can pause or resume any time, and Reset
returns the timer to the last set values in one click.
To make common durations faster, use the quick presets or the Refill Last button to restore your most recent settings. Finish cues are gentle: the timer flashes and, if enabled, plays a small chime created in the browser—no downloads or network requests. For repeating intervals, turn on Loop so the timer automatically restarts when it reaches zero.
Everything is privacy-friendly: no data is uploaded, and there are no background trackers beyond your site’s analytics. Because timing uses a monotonic clock, adjustments to the system time won’t affect the countdown’s accuracy while it runs. This makes the tool reliable for study sessions, workouts, cooking, presentations, and classroom activities where precision and simplicity matter.