Online Clock, Timer, Alarm and Stopwatch
BestOnlineClock is a set of browser-based time tools for checking the current time, setting a countdown, scheduling an alarm, measuring elapsed time, and comparing selected cities. No account or download is required; keep the page open whenever a timer or alarm needs to run.
Choose a time tool
Designed for everyday timing
- • Clock display with 12/24-hour format, date, weekday, colors, and fonts.
- • Timer and alarm sounds can be previewed after you choose them.
- • Settings are kept locally in your browser and can be reset at any time.
- • Fullscreen and wake-lock behavior depends on browser and device support.
A clear starting point
Start with the large clock above, then open a tool when you need a countdown, reminder, elapsed-time record, or city comparison. Tool pages include their own instructions, presets, and frequently asked questions so the homepage stays focused.
Open the timer presetsFind us in independent tool directories
Frequently Asked Questions About Our Online Clock
Is this online clock free to use?
Yes. The clock and its timer, alarm, stopwatch, and world-time tools are free to use in a browser, with no account required.
Does the online clock work on mobile devices?
The layout provides touch-friendly controls for mobile, tablet, and desktop screen sizes. Available browser features can vary by device.
Do I need to install anything?
No installation is required. Open the page in a supported browser and choose the tool you need.
What should I know about fullscreen and Wake Lock?
Fullscreen can request the Screen Wake Lock API when the browser and device support it. Keep the browser tab open for a timer or alarm, and note that the browser or device may release Wake Lock and may limit audio playback.
How does the clock determine the displayed time?
The clock follows the device system time and updates on the next system-second boundary, so the displayed result depends on the device and browser clock.