Countdown Timer

The Countdown Timer counts down to any date and time you choose, breaking the remaining time into hours, minutes, and seconds so you always know exactly how long is left before an event starts. It solves a very specific problem: you're running a presentation, a webinar, a live stream, a wedding, a product launch, or a classroom activity, and you need something visible on screen that keeps everyone honest about the clock without you having to glance at your phone or do the math yourself. Because it runs entirely in the browser, you can pull it up on a laptop connected to a projector or a second monitor and trust it to keep counting without any app install or account.

Set your target date and time and the timer immediately starts calculating and displaying the difference in hours, minutes, and seconds, updating every second. When the countdown hits zero it plays an alarm sound, so you don't have to keep watching the screen to know when time is up — useful for timing a talk, a break, or a game round. The full-screen display mode strips away browser chrome and blows the numbers up large enough to read from across a room, which is what makes it genuinely usable for presentations and events rather than just a desktop widget.

A practical tip: switch to full-screen mode before you go live so the audience sees only the countdown, not your browser tabs and bookmarks bar. All the timing logic runs client-side in your browser, so there's nothing to upload and no sign-up required — just set the time and go.