Full-screen countdown timer for presentations with color-coded warnings and customizable time segments.
A countdown timer that takes over the whole screen during a live presentation. You set the total duration, start it as you begin speaking, and the display shows the remaining time as a large, room-readable countdown that changes color as the end approaches, so the warning reaches the speaker without breaking the flow of the talk. Instead of one unbroken countdown, you can also split the time into custom segments, each with its own budget. The common surprise is that the timer only measures what happens after you press start: it does not know you started late, paused for questions, or that the organizers changed the schedule.
When you start it, the timer takes over the browser window and shows the remaining time as a large countdown readable from across the room. It runs continuously down to zero, so the presenter and the audience watch the same clock. Before the talk you choose the total duration; the countdown then works backward from that number.
As the remaining time shrinks, the display changes color to warn that the end is near, so the signal reaches the speaker at a glance without reading exact seconds. The tool also accepts custom time segments, letting you divide the total into parts, each with its own duration. With segments set, an overlong section becomes visible while it is happening, instead of surfacing only at the end.
The display uses color so the warning registers at a glance as the end approaches, but the exact thresholds, and what each color stands for, depend on how the tool is configured. Check the settings before you present, and if the room enforces its own cutoff, set the total time to match it. Do not assume the colors line up with anyone else's clock.
No. It works as a plain full-screen countdown with a single total time, and segments are simply an option for talks with an internal structure. If you leave them unset, the timer counts down the whole slot in one block. The trade-off: a slow opening stays invisible until the overall warning, where segments would have flagged the overrun while that section was still running.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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