Fullscreen clock, timer, and stopwatch tools
ClockFullscreen turns any browser into a large, glanceable time display for a whole room. It brings together five focused tools — a clock, a countdown timer, a stopwatch, a monthly calendar, and a presentation timer — each designed to open in one click and fill the screen with clear, readable numbers. There is nothing to install and no account to create: pick a tool, press start, and switch to full screen.
Five tools for shared time
The fullscreen clock shows the current time in large digits for classrooms, offices, studios, and reception screens. The countdown timer runs activities, breaks, and workouts against a visible deadline, with warning colors as the end nears. The stopwatch counts up with lap support for training and timed tasks. The monthly calendar puts the date on a shared display, and the presentation timer keeps speakers on schedule with clear warning and overtime cues.
Every tool shares the same idea: put one clear number where a whole room can read it, and get everything else out of the way. In full screen there are no tabs, menus, or notifications — just the time, sized to be read from the back of the room.
Who it is for
Teachers use it to pace lessons, run activity timers, and show the time without interrupting the class. Speakers and event hosts use the presentation timer and event countdown to stay on schedule on stage. Remote workers keep a large clock or focus timer on a second monitor. Trainers and coaches time rounds and rest with the stopwatch, and offices put a clock or calendar on a shared wall display.
Because the tools run in any modern browser, they work the same on a laptop, tablet, classroom display, meeting-room screen, projector, or second monitor.
How it works
Open a tool from the home page, adjust the settings if you want — theme, size, whether to show seconds, timer duration, warning thresholds — and press the button to launch it full screen. On supported browsers the page keeps the screen awake in full screen so the display will not dim or sleep during a lesson, meeting, or event.
Prefer to keep it handy? Add the site to your home screen or bookmark it so the tool you use most is one tap away. Everything runs locally in the browser, and your settings are remembered on your own device between visits.
Frequently asked questions
Is ClockFullscreen free to use?
Yes. Every tool runs in the browser with no account and no install, and works on laptops, tablets, classroom displays, projectors, and second screens.
Do the tools work full screen on a projector or TV?
Yes. Each tool has a fullscreen mode that fills the display with large numbers, and on supported browsers it keeps the screen awake so the display stays on during long sessions.
Does it keep my settings between visits?
Yes. Preferences such as theme, size, and timer durations are stored locally in your browser, so the tools remember your choices on that device. Nothing requires an account.
Which tool should I use?
Use the clock to show the current time, the timer to count down a set length, the stopwatch to measure how long something takes, the calendar to show the date, and the presentation timer to keep a speaker on schedule.