Free Online Clock with Seconds
Check the time online, down to the second: this online clock runs straight in your browser, with no app and no signup. It syncs with our server the moment the page loads, so the time you see stays right even when your own device clock has drifted. Switch to an analog clock, add milliseconds, flip between 24-hour and AM/PM, or go full screen with the F key.
Need the time in another country instead? Use the world clock, which tracks several cities side by side.
How is this online clock different from the one on your device?
Your phone and laptop both have a clock already. Four reasons to open one in a browser tab anyway:
- It shows seconds. The Windows taskbar and the macOS menu bar hide them by default. When you need to hit an exact moment, whether that's a shift change, a drop or an auction close, you have to watch the seconds run.
- It's right even when your device is wrong. On load, the clock checks against our server and runs from that reading. A machine that hasn't synced in a while can be off by seconds or minutes without its owner ever noticing.
- It's big enough to read across a room. In full screen the digits fill the display, legible from the back of a classroom or a gym. The clock in your operating system is the size of a fingertip.
- Milliseconds when you want them. Very few system clocks show hundredths of a second. Here it's one switch away.
Display modes
Digital clock
The default view shows hours, minutes and seconds in large figures. The digits are monospaced, so nothing shifts sideways as they tick over.
Analog clock
Open settings and pick Analog for a classic round face: all twelve numerals, a tick for every minute with the hour marks weighted heavier, rounded hour and minute hands, and an orange second hand that sweeps instead of stepping. Handy if you prefer a dial, or if you're teaching a child to read one.
Milliseconds
Show milliseconds sits in the same settings panel. Turn it on and a small pair of digits appears at the lower right of the main time, hundredths of a second, the same as on the stopwatch. They run off your device's own clock anchored to the synced reading, so they're smooth and continuous, but don't treat them as a scientific measurement. To time an interval properly, use the stopwatch, which measures to a hundredth of a second and doesn't depend on the system clock.
24-hour or AM/PM
The same panel holds the hour format. Choose 24-hour or AM/PM; in AM/PM mode the clock adds AM or PM after the time, and your choice is remembered for next time.
What full screen is for
Press the full screen button next to the settings icon, or hit F. The clock scales up to fill the display, and after two seconds without mouse movement the remaining controls fade out, leaving nothing but the time on an empty background. Move the mouse to bring them back; press Esc or F to exit.
- Put it on the projector in a classroom or an exam hall and the whole room works from one clock, so nobody has to ask how much time is left.
- On a confidence monitor at a talk or a conference, the speaker can check the time without the audience noticing.
- A tablet propped in the corner of a gym shows the time at a size everyone on the floor can read.
- In a livestream or a studio it sits in a corner of frame, so viewers see the real time and the crew can hit their cues.
- An old monitor at a reception desk or in a shop turns into a wall clock, and you don't have to buy anything.
Why the time here can differ from your device
This page takes its time from a server, while your computer or phone runs on its own internal clock. Internal clocks drift, and if automatic sync is switched off or the machine has been offline for a while, the gap can grow to minutes.
If the time here is noticeably different from your device, your device is almost certainly the one that's wrong. To turn sync back on:
- Windows: Settings -> Time & language -> Date & time -> turn on Set time automatically, then click Sync now.
- macOS: System Settings -> General -> Date & Time -> turn on Set date and time automatically.
- Android / iOS: Settings -> Date & time -> turn on Automatic date & time.
On accuracy: the real margin of error is about half a second, limited by how the server reports time over the web. Precise enough for everyday use.
Keyboard shortcuts
- F - Enter or leave full screen
- Esc - Leave full screen
The rest of the options (digital or analog, milliseconds, 24-hour or AM/PM) live in the settings button under the clock, and they're remembered for your next visit.
Need the time somewhere else in the world?
This page always shows the time where you are. For Tokyo, London, New York or Dubai, use the world clock: it tracks several cities at once and tells you at a glance whether it's day or night there. Useful for calling family abroad or booking a meeting across time zones.
Frequently asked questions
Is this online clock accurate?
On load, the clock checks against the stopwatch-online.com server and runs from that reading, so it stays right even when your device clock has drifted. The margin of error is about half a second, which is fine for everyday use.
Why does the time here differ from my device?
Because this page reads the time from a server while your device runs on its own internal clock. A machine that hasn't synced for a while can be off by seconds or minutes. Turn automatic time sync back on in your system settings.
Does it show seconds?
Yes, hours, minutes and seconds are always shown. That's the main difference from the Windows taskbar or the macOS menu bar, which usually show only hours and minutes.
Can I see milliseconds?
Yes. Turn on Show milliseconds in the settings panel and two extra digits appear next to the time, hundredths of a second. They're smooth rather than millisecond-accurate, so reach for the stopwatch if you need to measure an interval.
Can I switch to an analog clock?
Yes. Open the settings button and pick Analog for a round face with all twelve numerals, a tick for every minute, rounded hands and a sweeping orange second hand. Pick Digital to go back.
How do I switch between 24-hour and AM/PM?
In the settings panel, under hour format. Pick whichever one you read faster, and the page remembers it.
How do I view the clock full screen?
Press the full screen button next to the settings icon, or hit the F key. Everything else fades out after two seconds, leaving only the clock. Move the mouse to bring the controls back, and press Esc or F to exit.
Does the page remember my settings?
Yes. Clock type, hour format and the milliseconds switch live in localStorage in your own browser, so the page opens the way you left it. None of it reaches us.
How do I see the time in another country?
Use the world clock instead. It tracks several cities at once, which this page doesn't do.
Does the clock keep running when I switch tabs?
Yes. While the tab is hidden the page stops repainting to save battery, but the time is still tracked against real time. Come back to the tab and it shows the current time immediately.