Live · Reads Your Device Clock
Online Alarm Clock
A free full-screen clock and alarm that runs in your browser, with analog and digital faces, animated backgrounds and nothing to install.
The clock
Your Local Time, Right Now
Large tabular digits that stay put as the seconds change, so nothing on the page jumps. Designed for classrooms, meetings, study sessions, workouts, and presentations. The layout scales beautifully on phones, laptops, and ultra-wide displays while keeping text readable and comfortable.
System-synced time, localized date, and 12/24-hour format — optimized for readability. Perfect for displaying on a second monitor, projector, classroom screen, or while presenting. The large digits reduce eye strain and remain clear from a distance.
Where the Time Comes From
The page asks your operating system what time it is, then formats it. Your OS keeps itself honest by contacting a network time server, so the number you see traces back to atomic clocks without you doing anything.
Why It Never Drifts
A plain one-second repeat slowly falls behind, because each redraw costs a few milliseconds. This clock instead schedules the next update for the moment the next second actually starts, so it stays locked to your system clock.
The Red Paddle
The marker sweeping the tick rule below the digits is the seconds hand, borrowed from the station clocks on railway platforms. It gives you the passing second at a glance, without reading a single number.
Alarm
Set an Alarm That Rings in the Browser
Pick a time, name it, choose a ringtone and leave the tab open. The alarm survives a page refresh because it is stored on your own device.
Set a local alarm time with notification and alarm sound. Ideal for reminders during work, study, breaks, or meetings. The alarm is stored locally in your browser, so it remains available if you refresh the page. Select a time and choose a ringtone from the dropdown, then use Test Sound once so the browser will allow audio later.
Audio may require one user gesture in some browsers — use “Test Sound” once if needed. Notifications help ensure you don't miss the alarm while multitasking. The ringtone dropdown loads tunes automatically; if a tune cannot load, the alarm falls back to the default beep.
Alarms are stored on this device and survive a refresh. They also appear on the full alarm page.
As a Bedside Alarm
Leave a laptop open with the tab in front and the volume up. Keep the charger connected and turn off sleep, or the screen will suspend the tab before morning.
As a Meeting Nudge
Set it five minutes before a call and label it with the meeting name. The label appears in the notification, so you know which one is starting.
As a Kitchen Reminder
For a fixed clock time an alarm is right; for a duration such as twelve minutes, the countdown timer is the better tool.
Stopwatch
Measure Elapsed Time, with Laps
Start, pause, record a split without stopping the main count, and reset. The space bar controls it while this section is on screen.
Start, pause, lap, reset — smooth and precise. Great for workouts, sprint intervals, study sessions (Pomodoro), exam practice, and any situation where you need to measure elapsed time exactly. Press Space to start and pause when this section is visible.
Laps appear newest first. Use laps for intervals, presentations, speed drills, and productivity tracking.
Press Space to start or pause.
Laps
Laps appear here, newest first, each with its split and total.
Countdown timer
Count Down to Zero
Type a duration or take a preset. You get a progress bar, an alert and a sound when it reaches zero.
Easy inputs plus progress plus alert and sound on completion. Use the countdown for cooking, workouts, deep work sessions, meetings, or study breaks. Enter values and press Enter to start straight from the keyboard.
When finished, you'll get a browser notification (or an alert fallback) and a completion sound.
Finishes at —
Presets
Press Enter in any box to start immediately.
World clock
What Time Is It Elsewhere
Nine reference cities across the major business time zones, updating every second. The full world clock covers far more, with search.
Instant global time zones for major cities. Great for remote teams, international calls, travel planning, and coordinating events across time zones. Refresh any time to sync the display instantly.
| City | Time zone | Local time | Date | Offset |
|---|
Search Any Location
Browsing from one country and need the time in another? Type any city or country below and get its live time, date and current weather.
Six Reference Clocks
The major business hubs as clock faces. Reading a dial is faster than reading digits when you only need to know roughly where the day has got to.
About Us
About US
ONLINECLOCK.NET is built as a premium utility website: fast loading, responsive on every device, and easy to use.
Our goal is simple — provide a beautiful, accurate Online Clock experience with essential timing tools that work anywhere. We focus on clarity and comfort: clean typography, calm colors, and stable layouts that don't jump while the digits update.
Whether you're studying, teaching, working, or training, the tools are designed to stay out of your way and just work. Everything on this online clock website is free, needs no account, and runs entirely in your browser.
Fast and Lightweight
No heavy frameworks and no video files. The online clock appears the moment the page loads, even on a slow connection, and keeps working offline once it has.
Accurate and System-Synced
System-synced time, localized date, and 12/24-hour format — optimized for readability. The clock reads your device time and aligns each update to the next second boundary to prevent drift.
Designed for Real Rooms
Designed for classrooms, meetings, study sessions, workouts, and presentations. The layout scales beautifully on phones, laptops, and ultra-wide displays while keeping text readable and comfortable.
Online Clock With Alarm, Stopwatch and Countdown Timer
One page that does the four things people actually need from a clock: tell the time clearly, wake you at a set moment, measure how long something took, and count down to a deadline.
The clock at the top reads your device time and re-renders on the second boundary, so it never drifts against your system clock. The alarm stores itself on your own device and survives a refresh. The stopwatch counts up with lap splits, and the countdown timer counts down to a duration or a calendar date. Nothing here needs an account, an install, or a network connection once the page has loaded.
It is built for the screens people actually put a clock on: a second monitor during work, a projector in a classroom, a phone propped up in a kitchen, a laptop at the front of a meeting room. The digits are tabular, so they hold their position as the seconds change and nothing on the page jumps while you are reading it.
Using the tools
Which Tool for Which Job
The four timing tools look similar but answer different questions. Picking the right one saves a lot of fiddling.
| You want to know | Use | Example |
|---|---|---|
| What time is it now | Clock | Checking you are not late |
| Tell me when it is 6:45 | Alarm | Standing meeting, school run |
| Tell me in 12 minutes | Timer | Pasta, a break, a drill |
| How long did that take | Stopwatch | Lap splits, a task benchmark |
| How long until a date | Countdown | Launch day, an exam, a holiday |
| What time is it there | World clock | Booking a call across zones |
In practice
Who Uses a Browser Clock, and Why
Classrooms and Lecture Halls
A full screen clock on the projector settles the room. Everyone sees the same time, so "five more minutes" means the same thing to thirty people. For tests, 24-hour mode removes the AM and PM ambiguity that causes arguments over when a paper actually ends.
Teachers often keep the timer on a second screen for activity blocks, and switch to the clock between them.
Remote Teams
When your colleagues are spread over four continents, the question is rarely what time it is here. Keeping a world clock tab open turns "can we meet at 3" into a decision you can make without arithmetic, and it catches the cases where a date boundary sits between you.
Agreeing on UTC for written schedules removes another whole class of mistake.
Focused Work and Study
The Pomodoro method — twenty-five minutes of work, a five minute break, a longer break after four rounds — needs nothing more than a countdown you can restart quickly. A visible progress bar helps more than you would expect: seeing the bar move keeps you in the chair.
Pair it with a quiet background theme if a blank screen feels stark.
Training and Physio
Interval work needs laps rather than a clock: press start once, then hit lap at the end of each set. The split column shows whether you are holding pace or fading, and the total keeps the whole session honest.
For fixed rest periods, the seconds timer with its short presets is quicker to reset than typing a duration.
Reading the clock
12-Hour and 24-Hour Time, Briefly
Both describe the same instant. The difference is only how the hours are labelled, and where the confusion tends to hide.
| 24-hour | 12-hour | Spoken | Notes |
|---|---|---|---|
| 00:00 | 12:00 AM | Midnight | The start of the new day, not the end of the old one |
| 06:30 | 6:30 AM | Half six | Morning |
| 12:00 | 12:00 PM | Noon | The one most people get backwards |
| 13:00 | 1:00 PM | One o'clock | Add 12 to afternoon hours |
| 18:45 | 6:45 PM | Quarter to seven | Evening |
| 23:59 | 11:59 PM | One to midnight | The last minute of the day |
The full conversion chart lists all twenty-four hours, and there is a printable PDF if you want one on the wall.
Contact
Get in Touch
Have feedback or feature requests? Send a message and we will read it.
You can also use this section for business inquiries, reporting bugs, or suggesting improvements to the design and tools. For the fastest response, include your device (mobile or desktop), your browser name and version, and the page address where you saw the problem.
Answers
Questions People Actually Ask
Common questions about accuracy, notifications, sounds, and supported devices.
Is the clock accurate?
Yes. The clock reads your device/system time and aligns updates to the next second to prevent drift. Almost every phone and computer syncs itself to a network time server many times a day, so in practice that puts you within a fraction of a second of official time.
If the time looks wrong, the fault is nearly always in the device settings rather than the page: turn on Set time automatically and Set time zone automatically, then reload.
Do I need to allow notifications?
Notifications are optional but recommended for timer and alarm alerts when you switch tabs or multitask. If notifications aren't available, the site falls back to an alert box, and the sound still plays either way.
Why does audio sometimes require a click?
Some browsers block sound until a user interacts with the page. Use “Beep” or “Test Sound” once to enable audio for that tab. This is a browser rule that stops websites making noise the moment they load, and it applies to every site rather than just this one.
Does it work on mobile?
Yes. The layout is responsive and scales the clock display to fit phones, tablets, laptops, and large screens. The one caveat is that mobile browsers suspend hidden tabs aggressively, so a long timer is more dependable on a computer or in your phone's own clock app.
Is this online clock accurate?
The digits come from your own device clock, and almost every phone and computer syncs itself to a network time server many times a day. In practice that puts you within a fraction of a second of official time. The page then aligns each redraw to the exact second boundary, so the display never drifts away from your system clock the way a naive one-second interval would.
If the time looks wrong, the fault is nearly always in the device settings rather than the page: turn on Set time automatically and Set time zone automatically, then reload.
Do I need to install anything or create an account?
No. Everything runs inside the browser tab you already have open. There is no download, no extension, no sign-up and no email address to hand over. Open the page, and the clock is already running.
Will the alarm still ring if I switch to another tab?
Usually yes on a desktop computer. Browsers keep background tabs alive, and if you have allowed notifications you get a system alert even when the tab is hidden. Phones are less reliable, because mobile operating systems suspend background tabs aggressively to save battery. For anything you genuinely cannot miss on a phone, set your built-in alarm app as well.
Why does sound only work after I click something?
Browsers block audio until you interact with the page, which stops sites from playing noise at you the moment they load. One click anywhere is enough to lift the block. Pressing Test sound once after loading the page is the reliable way to make sure the alarm will be audible later.
How do I switch between 12-hour and 24-hour time?
Use the 12h / 24h buttons above the clock. Your choice is stored in the browser, so the next visit opens in the same format. In 24-hour mode midnight is 00:00 and noon is 12:00, which removes the usual AM and PM confusion.
Can I put this clock on a projector or a second monitor?
That is one of its main uses. Press F or the full screen button and the digits scale to fill the display. Drag the window to the second screen first, then go full screen, and the clock stays there while you work on the primary screen.
Does the clock work offline?
Once the page has loaded, the clock keeps ticking without a connection, because it reads the device clock rather than a server. You will need a connection to reload the page or to load an alarm ringtone for the first time.
Is my data stored anywhere?
Your alarm time, chosen ringtone, dial preference and 12/24-hour setting are saved in your browser's local storage on your own device. They are never uploaded. Clearing site data removes them. The privacy policy covers analytics and advertising in full.