Classroom timer
A big countdown for the board. Pick a time, press Start, and the ring shows the class what is left.
Ready
5:00
How do I put a timer on the classroom screen?
Open this page on the computer connected to the projector, pick a time and press Full screen. Students see the time left in big digits and a ring that shrinks as it runs down.
A visual timer
The ring empties as time passes, so children who can't read a clock yet still see how much is left.
Full screen in one key
Press F. The timer fills the projector, readable from the back of the room.
A warning before the end
It turns yellow near the end and red at zero, with the words “Nearly done” and “Time's up”. A 5-minute timer turns yellow at 1:00 left.
How it works
Pick a time
Tap 1, 2, 5, 10 or 15 minutes, or type your own, like 7 or 7:30.
Start it
Press Start or Space. Pause any time, or add a minute if the class needs it.
Watch the colour
Yellow for the last fifth of the time (10 seconds to 1 minute), red at zero.
| Timer | Turns yellow at |
|---|---|
| 1 min | 0:12 left |
| 2 min | 0:24 left |
| 5 min | 1:00 left |
| 10 min | 1:00 left |
| 15 min | 1:00 left |
How long to set for common activities
| Activity | Time |
|---|---|
| Tidy up or switch tasks | 1–2 min |
| Think, pair, share | 3–5 min |
| Exit ticket or quick write | 5 min |
| Group work or a station | 10–15 min |
| Silent reading | 15–20 min |
Keyboard shortcuts
| Key | What it does |
|---|---|
| Space | Start, pause or resume |
| R | Reset to the length you set |
| + | Add a minute |
| F | Full screen on or off |
| M | Sound on or off |
| Esc | Leave full screen |
Keeps time in the background
Switch to your slides and back. The timer works from the clock, so it is never behind.
No sign-up, nothing saved
It runs in this tab only and works offline once the page has loaded.
Silent unless you ask
Sound is off until you turn it on. The colours and words do the job on their own.
Teaching from Google Slides? Change slides from your phone
Copresent turns your phone into a remote for Google Slides, with your speaker notes and a timer on it, so you can teach from anywhere in the room.
See how teachers use itMore classroom tools
FAQ
How do I make the timer full screen on the projector?
Press F or the Full screen button. The ring and the digits grow to fill the screen, so the back row can read them. Press Esc to leave full screen.
When does the timer change colour?
It turns yellow and says “Nearly done” for the last fifth of the time, at least 10 seconds and at most a minute. A 5-minute timer turns yellow at 1:00 left. At zero it turns red and says “Time's up”.
Can I add time without starting again?
Yes. Press +1 min, or the + key, while it runs. If time is already up, the extra minute counts from that moment.
Does it make a sound at the end?
Only if you tick “Sound at the end”. Then it plays a short chime when time runs out. Sound is off every time the page opens.
Does it keep time if I switch to my slides?
Yes. It works the time out from the clock instead of counting ticks, so it is right the moment you come back, even after the laptop sleeps.
Do students or I need an account?
No. There is no sign-up, nothing is saved, and it works offline once the page has loaded.