| # | Label | Alarm | Set At | Triggered At | |
|---|---|---|---|---|---|
| No alarm history yet | |||||
This online alarm clock helps you wake up on time and set reminders for tasks throughout the day. Choose your alarm time and sound, give your alarm a name, and save it — as long as the browser tab stays open, the alarm will ring automatically at the time you set, whether it's for right now, tomorrow morning, or any specific time you choose.
Setting an alarm on this free online alarm clock takes just a few seconds. Follow these simple steps:
If the time you pick has already passed today, the alarm automatically schedules itself for the same time tomorrow — perfect for setting a morning alarm before bed.
Here are some practical tips to make sure your online alarm works reliably every time:
Yes. The online alarm clock is fully responsive and works on iOS and Android browsers. However, on mobile you should keep your screen on and the browser tab open for the alarm to ring reliably. Some mobile browsers aggressively suspend background tabs.
Currently, one alarm can be active at a time. If you set a new alarm while one is running, the previous one will be replaced. Your alarm history is saved automatically so you can review past alarms.
No. The alarm requires the browser tab to remain active. If your device goes into sleep or hibernation mode, the browser will be suspended and the alarm will not fire. Keep your power settings set to "stay awake" for important alarms.
Yes, completely free. No sign-up, no account, no download required. The alarm clock runs entirely in your browser and works on any device with a modern web browser.
There are 11 unique alarm sounds: Alarm Clock, Alarm Bell, Rooster, Siren, Nuclear, Aliens, Rain, Bomb, Mystic, Chime, and White Noise. Each sound can be previewed before you set the alarm.
The Pomodoro Technique is a proven productivity method developed by Francesco Cirillo in the late 1980s. It uses timed work blocks to keep your brain focused and prevent burnout.
An online timer is a countdown tool that counts down from a set duration to zero and alerts you when time is up. Unlike an alarm clock — which triggers at a specific time of day — a timer measures elapsed time from when you start it, making it ideal for cooking, exercise, studying, meetings, and productivity techniques like the Pomodoro method.
This free online timer runs directly in your browser with no installation required. Simply enter hours, minutes, and seconds — or tap one of the quick preset buttons — then click Start. A visual progress ring shows how much time remains, and an audio alert sounds when the timer reaches zero.
Use the stopwatch to time yourself and compare against some of the fastest recorded times in human history.
This free online stopwatch measures elapsed time with millisecond precision. Press Start to begin timing, Lap to record a split time without stopping, and Reset to clear everything. All lap times are displayed in order, making it easy to compare performance across intervals.
The stopwatch works entirely in your browser with no download or installation required. It's accurate to within a few milliseconds and is suitable for sports, science experiments, cooking, and any situation where you need to measure time precisely.
People use countdown timers to build excitement and stay on track for meaningful events. Here are some of the most popular things to count down to:
This countdown timer lets you count down to any future date and time — whether it's a holiday, birthday, deadline, exam, event, or personal milestone. Simply pick a date, set a time, give your event a name, and watch the days, hours, minutes, and seconds tick down in real time.
The countdown runs entirely in your browser and updates every second. Unlike countdown apps that require an account or download, this tool works instantly on any device — desktop, tablet, or smartphone — with zero setup.
This online clock displays your current local time with an analog clock face and a precise digital readout. Both update every second in real time, giving you an accurate and visually clear view of the current time and date. The analog clock shows hours, minutes, and a sweeping second hand, while the digital display shows hours, minutes, and seconds.
The clock automatically uses your device's local time zone. For times in other parts of the world, visit the World Clocks or Time Zones section.
The world clocks display shows the current local time for major cities across every continent, updated every second. Whether you're scheduling an international meeting, calling family abroad, coordinating a global team, or simply curious about what time it is somewhere else, the world clock gives you an instant, accurate answer.
Times are calculated based on each city's UTC offset, including adjustments for Daylight Saving Time where applicable. Cities shown include New York, London, Paris, Dubai, Tokyo, Sydney, São Paulo, Mumbai, and many more across all major time zones.
| Time Zone | UTC Offset | Local Time |
|---|
Time zones are regions of the world that observe the same standard time. The world is divided into 24 main time zones, each roughly 15 degrees of longitude wide, corresponding to one hour of the Earth's 24-hour rotation. Time zones are expressed as offsets from Coordinated Universal Time (UTC), ranging from UTC−12:00 to UTC+14:00.
This table lists every standard UTC offset alongside the current local time for that zone, updated every second. Use it to convert between time zones quickly, plan international calls, or check what time it is anywhere in the world without needing to do any mental arithmetic.
Week numbers divide the year into 52 or 53 numbered weeks, which is especially useful for business planning, project scheduling, and payroll cycles. The most widely used standard is ISO 8601, where weeks start on Monday and the first week of the year is the one containing the year's first Thursday.
Week numbers are widely used in industries such as manufacturing, logistics, finance, construction, and project management because they provide a universal reference point that everyone on a team can use, regardless of the specific dates in a given month. The week calendar above shows all weeks in the current year with the current week highlighted.
Some famous spans of time that shaped our world — calculated in days:
This free date calculator instantly shows the difference between two dates in days, weeks, months, years, hours, and minutes. Simply enter a start date and an end date, then press Calculate to see the full breakdown. The calculator handles any date range — past or future — with no limit.
Date calculators are useful for many real-world applications: finding out how many days until a deadline, how long ago an event occurred, how many days are between two appointments, or planning a project schedule with specific milestones.
How long does it really take to become an expert? Some well-known time benchmarks:
This hour calculator adds up multiple time ranges and gives you the total number of hours and minutes worked or elapsed. Enter one or more start-time and end-time pairs — for example, your morning shift from 09:00 to 12:30 and your afternoon shift from 13:30 to 17:00 — and the calculator instantly totals the duration.
Overnight ranges are supported automatically, so if your shift starts at 22:00 and ends at 06:00, the calculator correctly computes 8 hours rather than a negative value. Add as many rows as you need for complex multi-shift days.
Different cultures count and celebrate age in fascinating ways:
This free age calculator tells you exactly how old you are in years, months, and days — plus total days, total weeks, total hours, and the number of minutes you've been alive. It also shows how many days remain until your next birthday.
Enter your date of birth and press Calculate. The result updates instantly and is calculated based on today's date. The age calculator correctly handles leap years and variable month lengths, so the result is always precise down to the day.
Most people know their age in years, but here are some surprising ways to think about how old you are:
Learn more about our free, web-based time management platform.
Online Alarm Clock is a web-based platform built to help users quickly and easily set alarms, timers, stopwatches, and other time management tools — completely free of charge.
We believe that making the most of your time matters to everyone. That's why we offer practical tools that work on any device and in any web browser, with nothing to download or install.
Online Alarm Clock is continuously improved to provide a simple, fast, and user-friendly experience. Making everyday life easier and time management more accessible for our users is our top priority.
Our platform includes an online alarm clock, timer, stopwatch, countdown timer, world clocks, a time zone table, week number calculator, date calculator, hour calculator, and age calculator.
All our tools run directly in your browser and can be used for free, with no installation or membership required. Thank you for choosing Online Alarm Clock.
Get in touch with us for any questions, suggestions, or feedback. We'll get back to you as soon as possible.
We aim to respond to your messages as quickly as possible.
Your privacy matters to us. This page explains how we handle your data.
Online Alarm Clock stores the settings needed for the alarm, timer, stopwatch, and other tools (such as alarm history and language preference) only in your browser's local storage (localStorage). This data is never transmitted to our servers and does not contain any information that could identify you personally.
When you contact us via the Contact page or by email, only the email address and message content you choose to share are processed, solely to respond to your request.
Our site may use cookies to improve user experience and analyze site traffic. You can disable cookies in your browser settings, though some features may not work properly as a result.
Our site displays advertisements through Google AdSense, a third-party advertising network operated by Google LLC. Google AdSense uses cookies and similar tracking technologies to serve personalized ads based on your browsing history and interests.
Google's use of advertising cookies enables it and its partners to serve ads based on your visit to this site and/or other sites on the internet. You may opt out of personalized advertising by visiting Google Ads Settings. You can also opt out of a third-party vendor's use of cookies by visiting the Network Advertising Initiative opt-out page.
For more information about how Google uses data from sites that use its services, please visit: How Google uses data when you use our partners' sites or apps.
Our site also uses Google Analytics to analyze site traffic and improve user experience. Google Analytics may collect data such as pages visited, time spent on the site, and browser/device type.
We take appropriate technical and organizational measures to keep your personal data secure. However, no method of transmission over the internet can be guaranteed to be 100% secure.
Depending on applicable data protection laws in your region, you may have rights to find out whether your personal data is being processed, and to request its correction or deletion. To exercise these rights, please contact us using the email address on the Contact page.
By using Online Alarm Clock, you agree to the following terms.
Online Alarm Clock is a web platform that provides free tools such as an alarm clock, timer, stopwatch, countdown, world clocks, time zones, date calculator, and age calculator. The services are provided "as is" and may be changed or discontinued without prior notice.
By using this site, you agree to comply with applicable laws, not to misuse the service, and to avoid any behavior that would negatively affect other users' experience.
The alarm and timer features rely on the browser tab staying open. Online Alarm Clock accepts no responsibility if an alarm fails to ring because the browser was closed or the device went into sleep mode. We recommend not relying on this tool as your only alarm for important appointments.
The design, logo, and content on this site are the property of Online Alarm Clock. Copying, reproducing, or using this content for commercial purposes without permission is prohibited.
Online Alarm Clock does not guarantee that the site will operate uninterrupted or error-free. The results of the calculation tools (date, age, hour calculators, etc.) are provided for informational purposes only; users are responsible for verifying results before relying on them for important decisions.
These terms of use may be updated from time to time. Updates take effect from the date they are published on this page. If you have any questions or feedback, please contact us via the Contact page.