Free online countdown timer and stopwatch

Countdown is a browser-based digital timer for lessons, exams, workouts, presentations, cooking and games. Set hours, minutes and seconds and press start — or switch to count-up mode and use it as a stopwatch that counts forward from zero. Nothing to install, no account, and it stays accurate because it measures elapsed real time rather than counting frames.

What you can do

• Count down from any duration up to 99 hours, or count up from zero.
• Read hours, minutes, seconds and hundredths of a second at a glance.
• Hide any unit you do not need — for example show only minutes and seconds.
• Go fullscreen for a distraction-free classroom or stage display.
• Use the keyboard: Space to start or pause, R to reset, F for fullscreen.
• Works on phones in portrait and landscape, tablets and wide desktop screens.

Questions

Is this countdown timer free?

Yes. It runs entirely in your browser, with no sign-up, no install and no cost.

Can I use it as a stopwatch?

Yes. Choose Count Up and the timer counts forward from zero with hundredths of a second.

Can I hide the seconds or hundredths?

Yes. Each unit has its own toggle, so the display shows only what you want to see.

Does it work on a phone?

Yes. The layout adapts to portrait and landscape phone screens as well as desktop monitors.