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Free online timer tools — no signup needed
Stopwatch: Track elapsed time with millisecond precision. Tap "Lap" to record split times — great for sports, workouts, cooking, or productivity tracking.
Countdown Timer: Set hours, minutes, and seconds. When the timer reaches zero, an alarm sounds. Perfect for pomodoro technique, cooking, exercise intervals, or reminders.
Works offline once loaded. No account, no tracking, completely free.
Quick answer: How to set an interval timer for workouts? Pick a work/rest split — 40 seconds on, 20 seconds off is a safe start — set the number of rounds, and press start; the timer beeps when it's time to switch. The classic Tabata is 8 rounds of 20 seconds on / 10 seconds off = exactly 4 minutes. Use the free timer above — no signup, works offline once loaded.
Three steps: (1) choose a work/rest split — beginners 30s on / 30s off, standard HIIT 40s on / 20s off, Tabata 20s on / 10s off; (2) set the number of rounds — 6 to 10 rounds makes a solid 10–15 minute session; (3) press start and move — a beep marks every switch, so you never have to watch the screen.
Worked example: Tabata = 20 seconds of work + 10 seconds of rest, repeated 8 times. 8 × 30 seconds = 240 seconds = exactly 4 minutes. Enter 0h 0m 20s work / 10s rest × 8 rounds in the countdown timer tab above to run it.
Honest accuracy note: phone browsers can pause timers when the tab goes to the background. Keep this tab open (and the screen on) while training; everything runs locally in your browser, so the timer keeps working even if your Wi-Fi drops after the page loads.
A stopwatch measures elapsed time with precision, and a countdown timer alerts you when time runs out. This free online stopwatch and timer works in any browser on your phone, tablet, or computer — no app to install and no signup required. Use the stopwatch with lap times to track workout sets, running splits, or study intervals. Use the countdown timer for cooking, exams, presentations, or the Pomodoro technique.
Because everything runs locally in your browser, the timer keeps working even if your internet drops after the page loads. For best accuracy, keep the tab open while timing — background tabs on phones can pause JavaScript timers on some devices. Bookmark this page and you will always have a reliable stopwatch and timer one tap away, 100% free.
How to set an interval timer for workouts? Choose a work/rest split (try 40 seconds on, 20 seconds off), set the number of rounds, and press start — the timer beeps at every switch. Tabata is 8 rounds of 20s on / 10s off = 4 minutes. Use the free countdown timer above; it works offline once loaded and needs no signup.
How do I use a pomodoro timer for studying? Study for 25 minutes, take a 5-minute break, and repeat four times, then take a 15–30 minute long break. Use the countdown timer tab above set to 25:00 for each focus block — the loud alarm marks the end of every block.
A solid default is 30–40 seconds of work with 15–30 seconds of rest for 8–12 rounds. Beginners should start at 20/40 (more rest than work) and progress toward 40/20 as fitness improves. Keep total hard effort under ~20 minutes until your conditioning catches up.
Work in focused 25-minute blocks separated by 5-minute breaks; after four blocks, take a 15–30 minute long break. The timer externalises discipline — during a block you do one task only, and the break is guilt-free because it is scheduled.
Mostly, but browsers throttle background tabs to save battery, which can delay on-screen updates and sometimes audio cues by a few seconds. For workouts or exams where seconds matter, keep the timer tab visible and the volume up.