Interval Workout Timer | Free Online HIIT · Tabata · Boxing Timer
Set work and rest intervals for HIIT, Tabata, boxing, and home workouts. Free online interval timer that runs entirely in your browser.
- #audio
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Set work, rest, rounds, and sets, then press Start. The timer and alerts run entirely in your browser — nothing is uploaded.
Quick presets
Timer settings
Alerts
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Frequently asked questions
What is interval training?
Interval training alternates high-intensity work with rest. Formats like HIIT and Tabata are popular for improving cardio in a short session.
How do I use the Tabata timer?
Choose the Tabata preset (20s work, 10s rest, 8 rounds), then press Start. After the prepare countdown, rounds run automatically.
Can I use it as a boxing round timer?
Yes. The Boxing preset uses 3-minute rounds with 1-minute rests (3 rounds). You can also customize times, rounds, and sets.
Does it work on mobile?
Yes. It works in phone and tablet browsers. Where supported, Screen Wake Lock keeps the display on, and Vibration API can provide haptic cues.
Is any data saved on a server?
No. Timing and sounds run only in your browser. Your last settings are stored in LocalStorage on your device and are never uploaded.