Open laptop, notebook, and coffee on a desk by a window
Everyday Timers

Reminder Timer

A timer that goes off at a set interval, on repeat — every few minutes or every half-hour — to prompt a break, a stretch, a sip of water, or a check-in. Built for desks and classrooms.

The Basics

The Online Reminder Timer

What a Reminder Timer Does

A reminder timer goes off at a fixed interval and repeats, so a recurring prompt — stand up, stretch, drink some water, check the time — happens on its own without you having to remember it. Pick an interval, press start, and a single clean beep marks each one for as long as you leave it running.

Every preset here runs entirely in your browser, with nothing to install and no account to create, on a big display you can read from across a room. It is built for desks and classrooms, not workouts: the prompts are about posture, breaks, hydration, and pacing a lesson, not exercise intervals.

For Desks and Classrooms

The most common use is breaking up long stretches of sitting. Ergonomics advice generally points to standing and moving every half-hour or so, and a repeating reminder makes that happen without willpower — it simply beeps, and you stand. The same beat works for a hydration nudge, a posture reset, or resting your eyes from a screen on a regular schedule.

In a classroom, a visible timer paces a lesson: a beep every few minutes to move a group on to the next task, or a longer interval to mark stages of an activity. On a projector or shared screen, everyone works to the same clock and the teacher is freed from being the timekeeper.

Pick an Interval or a Use Case

The presets cover the intervals people reach for most — every five, fifteen, or thirty minutes — plus two built for a specific routine: a [sit-stand cycle](/reminder-timer/standing-desk) for a standing desk, and a [lunch-break countdown](/reminder-timer/lunch-break). Each comes set to run for a sensible span, and any of them opens in the editor to change the interval or how long it runs.

Need a shorter, faster beat — every few seconds, for pacing a drill or practice rather than a break? The [beep timer](/beep-timer) is framed for that. For a longer or custom interval here, press “Build Your Reminder” to set any length down to the second; the interval lives in the URL, so a reminder you use daily is one click away.

Good to Know

Frequently Asked Questions

What is an online reminder timer?
A timer that goes off at a fixed interval and repeats — every five, fifteen, or thirty minutes, or whatever you set — to prompt a recurring action like standing up, stretching, or taking a break. It runs from a web page with nothing to install.
Does it repeat, or alarm only once?
It repeats — a single beep on the interval you choose, over and over. Each preset comes set to run for a useful span; open it in the editor and change the rounds to run it shorter or longer.
What is a good interval for a desk break reminder?
Ergonomics advice generally points to standing and moving about every thirty minutes, with shorter posture or eye breaks more often. The every-30-minutes preset matches that, or the standing desk preset runs a full sit-stand cycle.
Can I use it on a classroom projector?
Yes. Press the fullscreen button in the control bar and the countdown to the next reminder fills the screen, so it stays easy to read from the back of a room. Cast the tab to a projector and the whole class works to the same clock.
Is the reminder timer free?
Yes. It is free, needs no account, and runs in any browser on phone, tablet, or desktop. The same timers are in the free Seconds Interval Timer app on iOS and Android.
Woman holding an iPhone running Seconds Interval Timer
Mobile App

Seconds Interval Timer

The full Seconds experience — on iPhone, Apple Watch, and Android.

Get The App