Fullscreen Timer

Projection and Large Display Tips

The fullscreen timer is designed for one purpose: showing a countdown on the largest screen available, with zero clutter. When you click Enter Fullscreen, the browser's address bar, tabs, and toolbars disappear - leaving only your countdown and a clean background. The display scales automatically to fill any resolution, from a 13-inch laptop to an 85-inch 4K screen or a 3,000-lumen projector.

For classroom use, open this page on the teacher's computer, choose your duration using a quick preset or the custom fields, then click fullscreen before projecting. Students at the back of the room can read the display without squinting. The classroom timers page lists additional visual timer alternatives if a shrinking colour bar is more appropriate for younger learners. For speaker-specific timing at a conference or event, the presentation timers collection adds colour-coded zones that warn when time is nearly up.

Keyboard Controls in Fullscreen

You can control the fullscreen timer entirely from the keyboard - useful when you want to start, pause, or reset without moving your mouse to the controls.

• Space - Start or pause the timer
• R - Reset to the set duration
• Esc - Exit fullscreen mode (browser built-in)
• F - Toggle fullscreen on and off

Best Practices for Visible Timers

A fullscreen timer is only effective if the audience can actually read it. The table below covers the most important factors that determine visibility in different environments, along with recommended settings for each scenario. For the best results in a classroom, also check the notes on projector brightness and screen placement below.

Factor	Recommendation	Why It Matters
Colour scheme	Dark background, light digits	High contrast is readable from the back of any room; avoid white backgrounds on projectors
Font size	Use fullscreen mode - auto-scales	Each additional metre of viewing distance requires roughly 15 px more font size for comfortable reading
Screen brightness	Maximum projector brightness	Even low ambient light washes out dim projectors; close blinds when possible
Screen position	Eye level, centred on the far wall	High-mounted screens cause neck strain and reduce readability for seated audiences
Refresh rate	Any modern screen (60 Hz+)	The timer updates at 60 fps; older projectors at 30 Hz may show slight flicker on the millisecond digits
Browser	Chrome or Edge (recommended)	Best fullscreen API support and wake-lock behaviour to prevent screen dimming
Connection	Load while online, then disconnect	Timer runs entirely in JavaScript; no internet needed once the page has loaded

Where Fullscreen Timers Are Used Most

Classroom and education settings account for the majority of fullscreen timer sessions, reflecting how widely teachers use projected timers for transitions, tests, and group activities. Events and competitions are a growing use case - particularly for quiz nights, escape rooms, and live game shows. For a stopwatch that also works in fullscreen (counting up rather than down), use the large stopwatch linked below.

Frequently Asked Questions

Why won't the timer go fullscreen on my tablet?

Some mobile browsers - particularly iOS Safari - restrict the Fullscreen API and may not honour the fullscreen button. On iPad, try Safari's "Add to Home Screen" feature to open the page as a web app, which runs in a more permissive display mode. On Android, Chrome supports fullscreen correctly. Alternatively, pinch-zoom to fill the viewport and hide the browser UI manually using the browser's "immersive" or "reader" mode.

Can I use this as a presentation speaker timer?

Yes, though the presentation timers page is better suited to that use case - it includes colour-coded time zones (green/amber/red) and a speaker-facing display that shows a different view from what the audience sees. The fullscreen timer here is best for audience-facing countdowns where everyone watches the same display.

Will the screen go to sleep while the timer is running?

This page requests a wake lock automatically when supported (Chrome 84+, Edge 84+). This prevents the screen from dimming while the timer is active. On unsupported browsers or older devices, adjust your OS power settings to keep the screen on during the session. On macOS, go to System Settings > Displays > Advanced; on Windows, search for "power & sleep settings".

More Large-Screen Timing Tools

If the fullscreen countdown isn't quite right for your scenario, explore these alternatives. The large stopwatch counts up (not down) and supports lap recording, making it ideal for sports and group activities where total elapsed time matters. The standard countdown timer adds sound selection and auto-repeat. For classroom-specific tools, visual and sand timers are often more intuitive for young learners.

Quick Setup Checklist

Before starting a timed session in front of an audience, run through this checklist to avoid problems mid-presentation or mid-class:

1. Set the countdown duration using a preset or the custom fields.
2. Check the sound setting on the countdown timer if you need an audio alert (the fullscreen timer uses browser alert sounds).
3. Close unneeded applications and browser tabs to free resources and prevent pop-up notifications.
4. Set your operating system's display sleep timer to "Never" or a value longer than your session.
5. Test fullscreen mode before the audience arrives - confirm the display renders correctly on the projector.
6. Walk to the back of the room and confirm the digits are legible from the furthest seat.