Full Screen Countdown Timer
Set any time, press Start and the digits fill the screen. The timer turns yellow and then red near the end, rings at zero and can keep counting overtime. It runs in your browser with no sign-up.
Keys: Space start or pause, R reset, F fullscreen, + and - add or remove a minute, M mute, N next timer in the list.
What is a full screen countdown timer?
A countdown timer counts down from a time you choose to zero, then lets you know. A full screen countdown timer makes the numbers as large as the screen allows, so a whole room can read them: a classroom whiteboard, a stage monitor at a conference, a TV in a gym or a laptop at the front of a meeting. This one sizes the digits to fit any window without cropping them, turns yellow and then red as the end gets close, plays a chime, bell, alarm or beeps at zero, and either stops at 0:00 or keeps counting the overtime in red. You can show it on a projector in a separate display window, float a small copy on top of your slides, or share a link that opens the same timer on another computer. It all runs in your browser: no account, no app and nothing sent to a server.
How to use the countdown timer
- Pick a preset such as 5 or 10 minutes, or type hours, minutes and seconds. To finish at a clock time instead, choose Until a time and enter it, for example 10:45.
- Add a title if you want one, such as Quiet reading or Keynote, then choose Digits, Ring or Pie and a dark, black or light background.
- Press Start or the spacebar. Use +1 min and -1 min to change the time while it runs, and Pause (or Space again) to stop it.
- Select Fullscreen or press F to fill the screen. For a projector or second monitor, open the Display window, drag it across and make it fullscreen there; the controls stay on your laptop.
- At zero the screen flashes and the sound plays. The timer either stops at 0:00 or counts overtime in red, depending on the At zero setting. Press Reset or R to go back to the time you set.
Why use this countdown timer
- Digits as big as the screenThe numbers resize to fill any window, from a phone to a 4K TV, and keep the same width as they change, so nothing jumps.
- Warnings people can seeYellow and red stages at times you choose, a flash at zero and optional overtime in red.
- Two screens, one timerRun the controls on your laptop and a clean display on the projector, or float a small timer above your slides.
- On time in a background tabTime comes from the clock and the alarm is scheduled ahead, so switching apps never makes it late.
- A list of timers in a rowTalks and Q&A, work and breaks, reading and writing time: run them one after another from a single Start.
- Nothing to install or sign up forFree and private, with settings saved in your browser. A link recreates the same timer on any computer.
Common uses for a countdown timer
- Classrooms. Tests, group work, tidy-up and transitions on the whiteboard. See the classroom timer.
- Talks and conferences. Speaker time with yellow and red cues, overtime and wrap-up messages.
- Meetings. Timebox agenda items, stand-ups and brainstorms so they end when planned.
- Exams. Show the time left, the time of day and the finishing time to the whole room.
- Workouts and kitchens. Planks, intervals, baking and steeping tea, with a sound you can hear across the room.
- Breaks and events. Count down to the end of lunch or the start of a show with Until a time.
What the timer colors mean
The same traffic light colors are used on stages, in classrooms and at Toastmasters, so most people understand them without being told. You can set the yellow and red times yourself or let the timer pick them (about 20% and 5% of the time, rounded to a sensible number).
| Stage | When it shows | What it tells people |
|---|---|---|
| White digits, green bar or ring | Most of the time | Plenty of time left |
| Yellow | At the yellow time, for example 1:00 left of 5 minutes or 5:00 of 20 | Start wrapping up |
| Red | At the red time, for example the last 15 seconds or the last minute | Finish now |
| Red and flashing | At zero | Time is up. With Count overtime on, the red digits show how far over it is |
The words under the timer (Ends at, Paused, Over time, Time is up) carry the same information for anyone who cannot rely on color, and screen readers announce each stage.
How to show the timer on a projector, TV or second screen
There are four ways to get the countdown in front of people. All of them run on your computer, with no account and no server.
| Option | Best for | How |
|---|---|---|
| Fullscreen | One screen, such as a laptop connected to a mirrored projector or TV | Select Fullscreen or press F. Press Esc to leave. |
| Display window | A laptop plus a projector, smartboard or stage monitor set up as a second display | Select Display window, drag it to the other screen and select Fullscreen in it. The controls stay on your laptop and both stay in step. |
| Float on top | Presenting your own slides, or keeping an eye on time in other apps | In Chrome or Edge on a computer, select Float on top. A small timer stays above other windows. |
| Share link | Another computer in a different room | Select Copy a link to this timer and open it on the other computer. It is a separate timer, so start both together. |
| Screen sharing | Zoom, Teams or Google Meet | Share the display window as a window, or share your whole screen with the timer floating on top. |
How it compares with other online timers
- Stagetimer is made for event crews and syncs a timer across devices through its servers, which is the right choice when the operator sits at a different computer from the stage display. Its free plan limits how many timers and connected devices a room can have.
- Classroomscreen puts a timer on a dashboard of classroom widgets. It has a limited free version and paid plans.
- Online-Stopwatch has playful themed timers for children, such as races and bomb timers, with ads and a Premium login.
- vClock is a quick, simple online timer with sound options and the choice to count up after zero.
This timer covers what one room needs, in one page and for free: digits that fill the screen, yellow and red warnings, overtime, a display window and a floating timer kept in step on the same computer, messages to the speaker and a timer list. It does not sync across separate devices, because it never sends anything to a server.
Based on each product's own pages, checked in November 2026. Plans and features change, so check before you rely on them. Digital ToolPad is not affiliated with any of these companies.
Keyboard shortcuts
The shortcuts work while the timer is on screen, in fullscreen, and in the display and floating windows. They are ignored while you type in a box.
| Key | What it does |
|---|---|
| Space or K | Start, pause and resume |
| R | Reset to the time you set |
| F | Fullscreen on and off (Esc also leaves) |
| + or = | Add a minute |
| - | Take off a minute |
| Up and Down arrows | Add or take off a minute in fullscreen and the display window |
| M | Mute and unmute |
| N | Next timer in the timer list |
Example: a 20-minute talk with warning colors
Set 20:00 and type Keynote as the title. With the automatic warnings, the digits turn yellow at 5:00 and red at 1:00. Open the display window on the stage monitor and press Start as the speaker begins. If they run long, the clock keeps counting in red with Over time underneath, so everyone knows how far over the session is, and Messages for the speaker can put Please wrap up above the clock without stopping it.
What to expect from the result
The countdown is exact to the second and keeps time when you switch tabs, because it works from the clock instead of counting ticks. Browsers slow down hidden tabs, so the digits in a background tab may update late, but the alarm is scheduled ahead on the audio clock and rings on time. Sound needs one click or key press on the page first (pressing Start counts), and a phone on silent may not play it. Keep screen awake relies on the browser's wake lock, which current Chrome, Edge, Safari and Firefox support. The floating on-top timer needs Chrome or Edge on a computer; in other browsers, use the display window or fullscreen.
Countdown timer questions
Is this timer free? Do I need to sign up?
Yes, it is free and every feature is included: fullscreen, the display window, warning colors, sounds, overtime and the timer list. There is no account, no trial and nothing to download. Your settings are saved in this browser only.
How do I make the timer full screen?
Select Fullscreen under the timer or press F. Press Esc or F again to leave. On an iPhone, where browsers cannot make part of a page fullscreen, the timer fills the browser window instead; turn the phone sideways for bigger digits.
How do I show the timer on a projector or second screen?
Connect the projector or TV as a second display, select Display window and drag the new window onto it, then press F or select Fullscreen in that window. The controls stay on your laptop and both windows show the same countdown. To use another computer, copy a link to the timer and open it there; separate computers do not stay in sync, so start them together.
Can the timer count up after it reaches zero?
Yes. Under Warning colors, overtime and sound, choose Count overtime. After zero the digits keep counting in red with Over time underneath, which is what speakers and stage managers use. Choose Stop at 0:00 for a classroom or kitchen timer.
Can I change the alarm sound or turn it off?
Choose Chime, Bell, Alarm, Beeps or No sound, set the volume and press Test. Turn on Repeat the sound if it should keep ringing until you press a button, or Short beep at yellow and red for a quiet warning before the end. The M key mutes everything.
Will it keep time if I switch tabs or apps?
Yes. The timer works from the clock rather than counting ticks, so it is never behind when you come back. Browsers slow down hidden tabs, so the numbers in a background tab may update late, but the sound is scheduled ahead and rings on time. If the computer goes to sleep, nothing can play until it wakes; Keep screen awake stops the screen from sleeping while the timer runs.
Does it work without internet?
Yes. Once the page has loaded, the timer runs entirely in your browser, so losing Wi-Fi in the middle of a lesson or talk does not stop it. Nothing about your timers is sent to a server.
More timers and countdowns
For focus sessions with breaks built in, use the Pomodoro timer or the study timer. To count the days to a birthday, trip or launch, use countdown to a date.