About Online Alarm Clock -- Free Browser Alarm
Free online alarm clock that runs in your browser. Set multiple alarms, choose from alarm sounds, and get notified on time -- no app or downloads needed. Works on any device.
How to use
- Set your desired alarm time using the time picker. Choose the exact hour and minute you need to be alerted. This is useful for waking up from naps, reminding yourself about meetings, or timing cooking and laundry cycles when you don't have a phone alarm handy.
- Choose an alarm sound from the available options. Different sounds suit different situations -- a gentle tone works for meditation or rest reminders, while a louder alert is better for important deadlines. Preview each sound before setting the alarm so you know what to expect.
- Click the Set Alarm button to activate it. You'll see a confirmation showing when the alarm is scheduled. You can set the alarm and continue working in other tabs -- the browser will play the alert sound at the designated time as long as the tab stays open.
- Keep the browser tab open until the alarm fires. Unlike native phone alarms, browser-based alarms require the tab to remain active. On laptops, make sure your computer's sleep settings won't shut down the browser before the alarm time. Plugging in your charger and disabling auto-sleep is recommended for longer waits.
- Dismiss or snooze the alarm when it goes off. If you need a few extra minutes, snooze will reset a short countdown so you get another reminder. This works well as a secondary alarm system alongside your phone, or as a desktop reminder when your phone is in another room.
Frequently asked questions
Will the alarm work if I close the tab?
No. Browser-based alarms require the tab to remain open because they rely on JavaScript timers that stop when the tab is closed. This is a fundamental limitation of web applications compared to native phone alarms. To ensure your alarm fires reliably, keep the tab open, make sure your computer won't go to sleep, and turn your speaker volume up. If you're using this as a wake-up alarm, consider it a backup to your phone alarm rather than a replacement.
Can I set multiple alarms?
Yes. You can add as many alarms as you need, each with its own independent time and sound selection. All active alarms run simultaneously in the background. This is particularly useful for structured routines -- for example, setting alarms at 9:00 AM, 10:30 AM, and 12:00 PM to remind yourself to take breaks, switch tasks, or start meetings. Each alarm triggers independently, so you don't need to reset one before the next fires.
Does it work on phones?
Yes, it works on any device with a modern browser including phones, tablets, and computers. However, mobile browsers handle background tabs differently than desktops. On iOS, Safari may suspend background tabs after a period of inactivity, which can prevent the alarm from firing. For most reliable results on mobile, keep the browser tab in the foreground and ensure your device's ringer volume is turned up. On Android, Chrome generally handles background audio more reliably than iOS browsers.
Do I need an account?
No. The alarm clock works instantly with zero setup -- no account creation, no downloads, no personal data collected. Everything runs locally in your browser using JavaScript. Your alarm settings are not sent to any server and are not stored between sessions. This makes it ideal for quick one-time alarms at a library computer, a shared workstation, or any device where you don't want to install apps.
How is this different from my phone alarm?
A browser alarm is most useful when you're already working at your computer and want a desktop reminder without reaching for your phone. It's also valuable in situations where you can't install apps -- like a work computer with restricted permissions, a library or public computer, or a borrowed device. Phone alarms are more reliable for critical wake-ups because they work with the screen off. Use this as a convenient desk timer and task reminder, and your phone for anything sleep-related.
Can I use this for Pomodoro-style work sessions?
You can set alarms at fixed times to mark the start and end of work sessions, but for timed intervals the
Countdown Timer is a better fit. The Pomodoro Technique uses 25-minute focused work blocks followed by 5-minute breaks, with a longer 15-30 minute break after four cycles. A countdown timer naturally tracks the remaining time in each block, whereas an alarm clock works best when you know the exact clock time you want to be alerted.
Why can't I hear the alarm sound?
Most browsers require at least one user interaction (like a click) before they allow audio playback. If you set an alarm but don't hear it, check three things: first, make sure your device volume and browser tab are not muted. Second, ensure you've interacted with the page at least once after loading it. Third, check that your browser hasn't blocked audio autoplay for this site. You can usually fix autoplay issues by clicking the lock icon in the address bar and allowing sound permissions.
Part of ToolFluency’s library of free online tools for Productivity. No account needed, no data leaves your device.