Full-Screen Clock

A large full-screen clock with four skins — 12/24-hour, optional seconds and date. Perfect as a second-screen clock.

Skin

Display

12-hour Seconds Date

12:00:00

AM · Tuesday, Jun 9

Shortcuts: Space start/pause · R reset · F full screen. Press Esc to exit full screen.

12:00:00

AM · Tuesday, Jun 9

How to use the Full-Screen Clock

Choose your format. Set 12 or 24-hour, and turn seconds and the date on or off.
Pick a skin. Select the clock style you like best.
Go full screen. Enter full screen to turn any screen into a large, clear clock.

Why use our Full-Screen Clock

Big and glanceable. Shows the current time large enough to read from across a room or on a spare monitor.

Your format. Toggle 12 or 24-hour time, seconds on or off, and an optional date line.

Four skins. Minimal Digital, Flip Clock, Neon Glow or a seconds Progress Ring.

Second-screen ready. Go full screen on a spare device and use it as an always-on clock.

Free to use — premium coming soon

FREE

✓ 12/24-hour format
✓ Optional seconds & date
✓ Four full-screen skins
✓ Always-on full screen

PREMIUM

★ Remove ads
★ World-clock multi-timezone
★ Custom colours & fonts
★ Alarm at a set time

About the Full-Screen Clock

The Full-Screen Clock turns your entire browser window into one large, easy-to-read time display. Instead of squinting at the small clock tucked in the corner of your taskbar or menu bar, you get oversized digits that stay legible from across a room. It is built for situations where the time needs to be glanceable rather than hidden: a desk during deep work, a kitchen counter while cooking, a podium during a talk, or a spare phone propped up as a bedside display. One click expands it to fill the screen, and a second press of the Escape key brings the normal page back.

Reach for this tool whenever a standard system clock is too small or too cluttered to read at a distance. Teachers project it onto a smartboard so a whole class can pace an exam without anyone asking how much time is left. Presenters and debaters keep it on a confidence monitor to stay on schedule. Remote workers park it on a second monitor as a constant time reference, and streamers capture the page as a browser source in OBS to add a clean on-screen clock to a broadcast. Because the readout is large and high-contrast, it doubles as a simple lobby or waiting-room display.

Under the hood it is pure client-side JavaScript. Your browser reads the current time directly from your device clock and repaints the digits roughly once a second, so the time shown is exactly as accurate as the machine you are on. Pressing the full-screen control calls the browser's native Fullscreen API to hide tabs, the address bar, and the operating system chrome; F11 does the same thing on most desktop browsers. Nothing is fetched from a server to tell the time, which means the clock keeps ticking even if your internet connection drops after the page has loaded.

Privacy and accuracy are both straightforward here. The clock never sends your time, location, or activity anywhere because it relies entirely on your own device's system clock and time zone settings. If the displayed time looks wrong, the fix is almost always on your device, not the page: enable automatic date and time in your system settings so it syncs against a network time source. For long unattended sessions, note that most browsers will dim or sleep the screen on their own, so pair the clock with your operating system's keep-awake or caffeine setting if you need it to stay lit overnight.

Frequently asked questions

How do I make the clock fill my whole screen?

Click the full-screen button on the page, or press F11 on most desktop browsers, to hide the tabs and address bar so only the clock is visible. Press the Escape key (or F11 again) to return to the normal view.

Is the time accurate?

The clock reads the time straight from your own device, so it is exactly as accurate as your computer or phone. If it looks off, turn on automatic date and time in your system settings so your device syncs with an internet time server.

Will the clock stop if my internet disconnects?

No. Once the page has loaded, the time is calculated locally in your browser with no further server calls, so the clock keeps running even with no connection.

Can I use this as a clock overlay for OBS or streaming?

Yes. Add the page as a Browser Source in OBS or similar software and paste the page URL. It then appears as an on-screen clock you can position and resize within your scene.

How do I keep my screen from going to sleep while it shows?

Browsers do not block the system screensaver on their own, so use your operating system's keep-awake feature (such as a caffeine or presentation mode) to stop the display from dimming during long sessions.

From our blog

How to Run a Visible, Stress-Free Timer with a Full-Screen Stopwatch

By the Super Simple Digital Tools Team · Updated June 2026

A regular stopwatch answers the question for one person holding it. A full-screen stopwatch answers it for a whole room. The moment you need a shared sense of time, where a class, an audience, or a group of athletes all glance at the same number, a tiny on-screen widget stops being useful. Maximizing the digits so they read clearly from across a space is the entire point of this tool, and it is the difference between people asking how much time is left and people simply looking up.

Setting it up takes seconds. Open the page on whatever device feeds your display, whether that is a laptop wired to a projector, a tablet on a stand, or a phone leaned against a water bottle. Enter full-screen mode so the page chrome disappears and the digits grow as large as the screen allows. From there the controls are deliberately simple: Start begins counting, Pause holds the current reading without losing it, and Reset clears back to zero. Learning the keyboard shortcuts pays off fast, because pressing Space to start and pause means you never have to break eye contact with a class or fumble for a button mid-activity.

Laps are where a stopwatch earns its keep for repeated efforts. During interval training, drills, or any activity with rounds, pressing Lap snapshots the moment without stopping the clock. The tool keeps two numbers for each lap: the time for that segment alone and the running total since you started. Reviewing the list afterward shows whether someone sped up or slowed down across rounds, which is far more useful than a single final time. Because the laps stay on screen, you can call them out as you go or read them back at the end of the session.

The full-screen format unlocks uses a pocket stopwatch cannot match. In a classroom it becomes a calm, shared signal for timed tests and tidy-up transitions, removing the constant chorus of questions about time remaining. In presentations and workshops it keeps a speaker and audience honest about pacing. At quiz nights, escape rooms, and game shows it builds tension everyone can feel. And for long events you can leave it running for hours, since it is tracking real elapsed time rather than relying on a fragile in-page counter.

A few habits keep things smooth. Before anything that matters, do a quick test run so you know your shortcuts work on that device and the screen will not dim or sleep mid-count. Keep the device plugged in for long sessions so a dying battery does not end your timer early. Remember that the visible reading rounds to hundredths of a second, which is plenty for teaching and training but not a substitute for certified equipment when fractions of a second decide a result. Used within those bounds, a browser stopwatch is one of the most reliable, zero-cost tools you can keep open in a tab.

Learn the shortcuts before you start: Space to start/pause and L for a lap let you control the timer without looking away from your class or group.
Plug the device in for long sessions so the battery cannot die mid-count, and disable screen sleep so the display does not dim during a quiet stretch.
Use Lap rather than Pause for interval training, so the clock keeps running while you record each round's split for review afterward.
Test full-screen mode on the actual projector or screen first, since the readable distance depends on the display size, not the device you control it from.

Read the full guide →

Tool by the Super Simple Digital Tools Team. Reviewed by our editorial team. Free to use, no signup required.