Which tool should I use?
The quickest way to the right one.
| If you want to… | Use |
|---|---|
| Count down to a date or duration | Countdown Timer |
| Time laps as they happen | Stopwatch |
| Run repeating work/rest intervals | Interval Timer |
| Focus with the Pomodoro method | Pomodoro Timer |
| See the time in other cities | World Clock |
| Be woken or reminded at a set time | Online Alarm Clock |
Timers that run in your browser
These are working utilities rather than reference tools: each one runs live in your browser, so a countdown ticks down, a stopwatch keeps time, and an alarm sounds when it’s due — no account, no app to install. For sound-based tools like the alarm and interval timer, your browser may ask permission to play audio.
One thing to know: because they run in the page, a timer keeps going while the tab is open, but closing the tab ends it. If you need to calculate a duration rather than run one, the time calculators are the right place.
Frequently asked questions
Do I need to install anything?
No. Every timer and clock runs in your web browser — just open the page and start.
Will a timer keep running if I close the tab?
No. The timers run in the page, so a countdown or stopwatch stops when you close its tab. Leaving the tab open (even in the background) keeps it running.
Will the alarm sound if the tab is in the background?
Usually yes, as long as you have allowed the page to play sound and the browser hasn’t fully suspended the tab.
Are they free?
Yes, every timer and clock is free with no sign-up.
Explore other categories
Every tool here is built and reviewed by Fletcher Langley, with the method shown on each page and examples verified by hand — see our editorial policy.