Countdown Timer

A simple, full-screen countdown timer. Type in a duration, press Start, and watch the big digital display tick down to 00:00 with an alarm at the end.

Use the quick +1:00 and +5:00 buttons to stretch the time without stopping, and toggle the alarm sound off if you just want a silent visual countdown.

How it works: press Start to begin the countdown, Pause to hold it, and Reset to return to the set time. The +1:00 and +5:00 buttons add time on the fly. When it reaches zero the display flashes and an alarm beeps until you press Stop — turn the alarm off with the checkbox if you want a silent timer. The tab title shows the time remaining so you can watch it from another tab.