Free Online Interval Timer

A clear clock for repeatable intervals

An interval timer organizes a session into timed periods instead of asking you to watch a stopwatch. Set an active period, a recovery period, the number of rounds, and a short preparation countdown. The browser then moves through the full sequence and shows what is happening now.

The large display, phase label, round count, and optional audio cues are meant to remain understandable at a glance. This online interval timer runs locally in your browser and does not require an account, app download, or payment. Your most recent settings may be saved on the current device so they are ready on your next visit.

How to use the interval timer

Three short steps take you from setup to a running session. The suggested values are examples for operating the timer, not personalized training advice.

Common ways to structure timed sessions

Equal work and recovery periods create a simple, predictable rhythm. Shorter rest periods keep the next active phase close, while longer recovery allows more time before the following cue. There is no universal setting that suits every activity or person; configure the interval timer for the session you have already chosen.

People use work and rest timers for gym movements, mobility drills, study breaks, practice stations, run-walk sessions, and many other repeatable tasks. For specialized formats, use the dedicated timer whose controls match the activity rather than forcing every session into the same pattern.

Interval timer or stopwatch?

A stopwatch measures elapsed time and leaves every transition to you. An interval timer follows a prepared sequence and announces when each period changes. That distinction matters when your attention belongs on the activity instead of a clock.

The timer corrects its display against an absolute deadline rather than subtracting one second on every browser callback. If a background tab delays an update, the next update recalculates the remaining time. Browser power settings and device behavior can still affect sounds or display updates, so visual and audio cues should not replace a coach, official, or safety procedure.

Audio, fullscreen, and practical controls

Sound is separated into a master switch, three-second countdown signals, phase cues, and optional spoken labels. This lets you keep a short transition beep while turning off speech, or make the interval timer completely silent and rely on the written state. Browsers require a user action before audio begins, so the first Start press also unlocks the sound system. If that request fails, the visual sequence continues.

Fullscreen hides the setup panel and retains only the large clock, phase, round, next state, pause, skip, reset, and exit controls. Settings are locked while a session is active to prevent an accidental tap from rebuilding the timeline. Reset returns to configuration mode; restart after completion runs the same configuration again.

Check the session before pressing Start

Read the total duration, make sure the final phase is what you expect, and confirm that device volume is appropriate for the space. A five-second preparation delay can be useful when the device needs to be placed out of reach. If no sound is appropriate, keep the display in view and use the text labels rather than depending on color.

The interval timer asks for Screen Wake Lock only after a session starts. Supported browsers may release that lock when the page becomes hidden, so the app requests it again after a return. This improves convenience but cannot override operating-system power controls. Saving the most recent validated setup also depends on local storage being permitted by the current browser profile.

Frequently Asked Questions

Practical answers about how this timer format works.