For teachers

The countdown timer built for classrooms

Any duration. Any label. Readable on any projector. Free — no account, no ads, no limits.

Create a countdownGet embed code

Slate theme — designed for projector visibility

Built for the front of a classroom

Any duration

Set a timer for 3 minutes or 3 hours. No fixed time limits like video players.

Custom labels

"Time for your test!" or "Lunch in…" — whatever you want students to see.

Projector-ready themes

Slate and Classic themes are high-contrast by design, readable from the back of any room.

Embeds anywhere

Drop an iframe into Google Sites, Canvas, Schoology, or any website.

Free, forever

No account required. No ads on countdown pages. Nothing to install.

Curriculum-ready history timers

How long since the moon landing? The Civil War? Use Time Since for history and science classes.

Up and running in under a minute

1

Set your end time

Pick any date and time — or set a duration using the embed generator below.

2

Add a label

"Quiz ends in", "Break time", "Pack up in…" — any message you like.

3

Choose a theme

Slate for projectors. Classic for maximum contrast. Five themes total.

4

Share or embed

Copy the URL to display full-screen, or grab the embed code for any page.

Generate your embed code

Configure your countdown below, then copy the code into Google Sites, Canvas, or any website. Generate the code right when you're ready to start the timer.

Timer label
Duration
Theme
Size

Historical timers for history and science

How long since the moon landing? Since World War II ended? Since the first iPhone? Curriculum-ready "Time Since" timers you can display in class or embed in a lesson.

Explore Time Since timers

Common questions

Google Slides doesn't support iframes directly, but there are a couple of options. The simplest: open your countdown on CountdownClock.net and display it full-screen in a separate browser tab while your slides are in presenter view. You can also embed the countdown in a Google Sites page, or use a third-party Google Slides add-on that supports web embeds.

CountdownClock.net is free, requires no account, and shows no ads on countdown pages. You can set any duration, add a custom label like "Test ends in" or "Lunch in…", and choose from several projector-friendly themes. The Slate (dark blue) and Classic (black) themes are high-contrast and readable from across a room.

Yes. Open the countdown link in Chrome or any browser, press F11 for full-screen, then mirror or cast to your projector. The Slate and Classic themes are specifically designed for visibility at a distance.

Go to CountdownClock.net, enter your end date and time, type a label like "Quiz ends in" or "Pack up in…", pick the Slate or Classic theme, then copy the link. For an embeddable version, use the generator on this page.

An internet connection is required to load CountdownClock.net. Once the countdown page has loaded, the timer continues running in the browser even if the connection drops temporarily, so a brief outage mid-class won't break it.

Ready to try it?

Create a countdown in under a minute. No account needed.

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