Calculators · preset
30 Minute Timer
A free 30 minute countdown timer with an alarm — great for workouts, baking and deep-work blocks. Starts with one click and keeps counting accurately in background tabs.
This page opens a 30 minute countdown timer — press Start and an alarm sounds when the time is up. It counts against a fixed end time, so it stays accurate even in a throttled background tab, and the remaining time shows in the tab title. Runs entirely in your browser.
Other countdown timer presets
How it works
- Set hours, minutes and seconds, or tap a preset like 5 min or 25 min.
- Click Start — pause and resume whenever you need.
- At zero the display flashes and an alarm sounds.
Frequently asked questions
How do I set a 30 minute timer?
The duration is already set on this page — just press Start. You can pause, resume or reset at any time.
Will the alarm sound if I switch tabs?
Yes — the countdown tracks a fixed end time, so it stays accurate in background tabs, and the remaining time shows in the tab title.
Is anything uploaded?
No — the timer and alarm run entirely in your browser.