Fullscreen Timer
A room-sized countdown for projectors, TVs, meeting rooms and streams.
Set the time, press Fullscreen, and the countdown fills the display at whatever size the screen allows — the digits scale with the viewport rather than sitting in a fixed box, so a 65-inch meeting room screen gets 65 inches of clock. Press Esc to come back. If you are casting to a TV or projector, cast the tab and leave this page in fullscreen on the source machine.
Space start/pause · R reset · +− adjust
Floating Picture-in-Picture needs a Chromium browser; this one doesn't support it.
Background sound
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More ways to run this timer
Proven Timer Pages
Name, share, or schedule a custom countdown →Related Timers
Embed this timer
Paste this into any page — a class blog, a lesson plan, a meeting agenda — and visitors get a working fullscreen timer with no script tag, no account and no tracking. Please keep the credit link.
About the Fullscreen Timer
A big fullscreen countdown timer for presentations, meeting rooms, classrooms, gyms and streams. One click fills the screen with the clock, readable from the back of a room, with an alarm at zero.
TimerHub calculates remaining time from an absolute finish timestamp, so missed browser callbacks do not create drift. Read the timing accuracy methodology and reproducible tests.
Getting a big countdown onto a shared screen
| Setup | What to do |
|---|---|
| Projector or meeting room TV | Mirror or extend the display, open this page on the shared screen, press Fullscreen |
| Chromecast or AirPlay | Cast the browser tab, then go fullscreen on the source device |
| Second monitor | Drag the window to the second screen before pressing Fullscreen |
| Floating over slides | Use the Float button for a Picture-in-Picture countdown that stays on top |
| Embedded in a page | Use the embed code to drop the countdown into your own site |
Common Uses
- Conference talks and lightning rounds
- Meeting room time-boxing
- Classroom activities on a projector
- Gym and bootcamp stations
- Stream countdowns and intermissions
How to Use the Fullscreen Timer
- Click Start (or press Space) to begin your 15 minute countdown
- Press Space again to pause and resume, or R to reset the timer
- Use the +/- buttons to adjust by 1 minute while running
- Toggle Repeat to loop the countdown automatically, and watch the finish time under the display
- Use the Fullscreen control below the timer for a large full-screen countdown (Esc to exit)
- Pick a background sound — rain, ocean, fireplace or brown noise — that fades out at zero
- Choose or mute the alarm sound from the sound settings in the header
- Add
?autostart=1to the link to start the countdown on load - Enable notifications for alerts when your fullscreen timer finishes, even in a background tab
Frequently Asked Questions
How do I make the timer fullscreen?▾
Press the Fullscreen control under the countdown, or press F11 in most desktop browsers. Esc exits. On iOS Safari the Fullscreen API is unavailable, so the control is hidden — rotate to landscape for the largest display instead.
Can I keep the countdown on top of my slides?▾
Yes, in Chromium browsers. The Float control opens a small always-on-top Picture-in-Picture window with the countdown and a start/pause button, so it stays visible over a presentation or a shared screen.
How large do the digits get?▾
The countdown scales with the viewport, up to a very large size on a big screen, and uses tabular figures so nothing jumps as the numbers change. It is designed to be readable from the back of a classroom or meeting room.
Will the alarm sound through the room speakers?▾
It plays through whatever audio output the browser is using, so if the projector or TV is the sound output it will play there. Test the volume before the session — and remember the alarm needs one click anywhere on the page first, which pressing Start provides.