30 Minute Timer — Online Countdown
Count down from the minutes and seconds you set, and play a short tone at zero.
🔒 Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
About this tool
This page opens the countdown timer already set to 30 minutes — press start and the half hour is ticking.
Half an hour covers a workout, a serious study session, most oven bakes, laundry cycles, and the honest version of "just one more game".
Any other length works too: the full timer takes minutes and seconds, pauses, resets and signals the end — all inside your browser.
Example. The form opens at 5 minutes and 0 seconds and displays 05:00. Start runs until 00:00, then the status reads Time is up. and a sine at 880 Hz plays for 0.35 seconds. A zero duration does not start.
Limit. There is no hour field, so 90 minutes display as 90:00. Seconds are clamped to 0–59. A hidden tab jumps to the deadline instead of ticking in the background. The tone does not repeat.