Fullscreen countdown timer and stopwatch for classrooms, exams, and presentations. Multiple simultaneous timers, color-coded urgency, overtime tracking, and lap recording.
Last updated: February 23, 2026
Fullscreen countdown timer and stopwatch for classrooms, exams, and presentations. Multiple simultaneous timers, color-coded urgency, overtime tracking, and lap recording. This tool runs in-browser for fast results with…
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This online timer is designed for teachers, professors, and exam proctors who need a clean, fullscreen countdown projected on a classroom board. Set any duration in hours, minutes, and seconds, hit start, and go fullscreen — students see massive, easy-to-read digits from across the room. The color-coded progress bar shifts from green to amber to red as time runs out, giving everyone a visual cue without having to read the exact numbers.
Need different groups finishing at different times? Add up to six independent timers, each with its own label and duration. Start them individually or all at once with "Start All." In fullscreen mode, timers automatically tile into a grid — two timers go side-by-side, three or four form a 2×2 grid, and five or six arrange in a 2×3 layout. Font sizes scale down automatically so every timer stays readable.
When a countdown hits zero, the timer doesn’t stop. It plays an audio alarm, flashes red, and begins counting into overtime with a negative display like −00:32. This lets teachers see exactly how far past the deadline a group has gone. Dismiss the alarm to stop the flashing while the overtime counter continues quietly in the background.
Switch to stopwatch mode for open-ended timing. The stopwatch counts up from zero with a lap button that records split times, individual lap durations, and wall-clock timestamps. Use it for timed presentations, science experiments, or any activity where you need to capture intermediate times.
The fullscreen mode strips away everything except what matters: digits, progress bars, and controls. Toggle between dark mode (ideal for projectors in dim rooms) and light mode with one click. The browser tab title updates with the remaining time so you can monitor progress even when the timer tab is in the background.
One-click presets cover the most common exam and classroom durations: 5, 10, 15, 30, and 45 minutes, plus 1, 1.5, and 2 hours. Set a custom duration with the hours, minutes, and seconds inputs for non-standard time blocks.