A free online timer, stopwatch and alarm clock
SnapTimer is a free countdown timer, stopwatch and alarm clock that runs in your browser with no download and no account. Pick a preset or enter any duration, press Start, and an alarm and fullscreen alert tell you when time is up, even if you have been working in another tab. It is built for the situations where timing needs to be dependable: cooking, studying, workouts, classrooms and focused work.
This page explains how to get the most from each tool, which timer to choose for common jobs, how the countdown stays accurate, and the mistakes that cause missed alarms.
How to use the timer, stopwatch and alarm
| Tool | How it works | Good for |
|---|---|---|
| Timer | Choose a preset (1 to 30 minutes or 1 hour) or enter hours, minutes and seconds and press Set. Start, pause, add a minute with +1 min, or Reset. | cooking, study blocks, workouts, meetings |
| Stopwatch | Counts up to the hundredth of a second. Press Lap (or L) to record split times without stopping. | running intervals, speeches, experiments, measuring how long tasks really take |
| Alarm | Set a clock time with an optional label. Alarms ring while a SnapTimer page is open and re-arm for the next day. | reminders, daily cues, class period changes |
Keyboard shortcuts: Space starts or pauses the timer or stopwatch (and silences a ringing alarm), L records a lap on the Stopwatch, and Esc dismisses the alarm.
Choosing the right timer for the job
| If you need... | Open | Why |
|---|---|---|
| an exact minute for a plank, breath or speech | 1 minute timer | shortest unit, easiest to commit to |
| tooth brushing or a two-minute start | 2 minute timer | matches dental advice and the two-minute rule |
| eggs, tea or a boxing round | 3 minute or 4 minute timer | common cooking and Tabata lengths |
| a break, a transition or a quick drill | 5 minute timer | standard short break |
| a sprint of work or a clean-up | 10 minute or 15 minute timer | long enough for progress, short enough to start |
| study blocks and short workouts | 20 minute or 30 minute timer | room for warm-up, practice and review |
| lessons and long study sessions | 45 minute or 1 hour timer | school period and meeting lengths |
| structured focus with breaks | pomodoro timer | 25 minutes of work, 5 of rest |
Real-world scenarios
- A home cook starts the 3 minute timer when the water returns to a boil, removes the eggs at the alarm and cools them, then adjusts by 30 seconds next time.
- A student runs a 25-minute focus block, takes a 5-minute break and ends the third block with ten minutes of recall.
- A teacher shows a fullscreen 5 minute countdown during transitions and uses a 15 minute timer for station rotations.
- A remote worker timeboxes email into two 15-minute sessions a day.
- A trainer runs 4 minute Tabata rounds and uses the stopwatch laps to compare sets.
Why the countdown stays accurate in the background
Many online timers subtract one second per tick and therefore fall behind when browsers throttle background tabs. SnapTimer stores the end time when you press Start and recalculates the remaining time from your device clock, so switching tabs does not change the result. The time remaining is shown in the browser tab title, and when the timer ends it plays a repeating two-tone alarm, flashes the title and shows a fullscreen alert. If nobody dismisses it, it stops on its own after two minutes. For the technical details, read how online timers work.
Guides to get more from timed work
Short articles that go deeper on specific uses: the Pomodoro Technique, studying with a timer, a kitchen timer guide, interval workout timing, timer ideas for the classroom and timeboxing for productivity.
Common mistakes and how to avoid them
- Never clicking before expecting sound. Browsers allow audio only after you interact with the page. Press Start or Space yourself and check the Sound switch.
- Letting the device sleep. A sleeping laptop or phone can pause the page. Change power settings for long timers.
- Closing the tab. The timer and alarms ring only while a SnapTimer page is open.
- Using a browser alarm for critical wake-ups or medication. Use a dedicated alarm device for anything with serious consequences.
- Forgetting to test a new setup. Run a one-minute timer before depending on a projector, speaker or phone.
Frequently asked questions
Will the timer keep running if I switch tabs?
Yes. The countdown is based on your device clock, so it stays accurate in a background tab, and the time remaining appears in the tab title.
Why didn't I hear the alarm?
Browsers only allow sound after you interact with the page. Press Start with the Sound switch on and check your volume. If the device slept or the tab closed, the page may have been paused.
Can I use it fullscreen on a projector?
Yes. Press Fullscreen for a large, distraction-free countdown that is readable from across a room.
Is my data stored anywhere?
Alarms and your sound preference are saved only in your own browser. SnapTimer has no accounts and no database of your timers. See the Privacy Policy.
Does SnapTimer cost anything?
No. It is free and supported by advertising. Read about SnapTimer or contact us with feedback.
Conclusion
SnapTimer gives you a dependable countdown, stopwatch and alarm without sign-up. Choose a timer that fits the task, press Start so the alarm is allowed to sound, keep the tab open and the device awake, and use the guides when you want to build the habit around the clock.
- Use Space to start and pause, L for laps and Esc to dismiss.
- Pick the timer length that matches the task, or enter a custom time.
- Press Start once so the browser allows the alarm sound.
- Keep the tab open and the device awake for long timers.