Stopwatch & Timer
Online stopwatch with laps + countdown timer with alert sound
Laps
Time's up!
Stopwatch & Timer — Complete Guide & Instructions
MakeCard Stopwatch & Timer combines two everyday timing tools on one page: a centisecond stopwatch with lap tracking and a countdown timer that sounds an alarm when time is up. The stopwatch records unlimited laps with split and total times; the timer accepts any minutes:seconds duration plus one-tap presets for 1, 5, 10, and 30 minutes. Everything runs in the browser — no app to install.
How to Use Stopwatch & Timer
- 1 Pick a tab: Stopwatch or Timer.
- 2 For the stopwatch, press Start, tap Lap to record splits, Pause to freeze, and Reset to clear laps.
- 3 For the timer, enter Minutes and Seconds or tap a preset (1, 5, 10, 30 min), then press Start.
- 4 When the countdown finishes, an alarm beeps three times and "Time's up!" flashes.
Key Features & Capabilities
- Stopwatch with centisecond precision — HH:MM:SS.CC display.
- Unlimited laps showing split (+time) and cumulative total.
- Pause and resume without losing elapsed time.
- Countdown timer with custom minutes:seconds and quick presets.
- Triple-beep alarm via WebAudio plus a pulsing "Time's up!" alert.
- Large high-contrast display readable across the room.
Supported Formats & Specifications
| Parameter | Specification |
|---|---|
| Stopwatch | Hours:minutes:seconds.centiseconds, unlimited laps |
| Lap Data | Split time and total elapsed per lap |
| Timer | Up to 999 minutes, presets at 1/5/10/30 min |
| Alarm | 3x 880 Hz beeps via WebAudio |
| Precision | 50 ms internal tick |
Practical Everyday Use Cases
- Timing runs, workouts, or HIIT intervals with lap splits.
- Running a Pomodoro or study session with the countdown.
- Timing a cooking process while away from the kitchen timer.
- Keeping presentations and speeches within their slot.
- Timing exam practice sections under real conditions.
Pro Tips for Best Results
- Keep the browser tab open — closing it stops the clock; the display resumes accurately while the tab stays live.
- Use Lap for interval training — each lap shows both the split and running total.
- The timer needs one interaction before sound is allowed — press Start once and the alarm will play.
- For long countdowns, set minutes well above the task and use the presets for common durations.
Common Problems & Solutions
Browsers block audio before user interaction — press Start once to unlock sound, and check the tab is not muted.
Lap activates only while the stopwatch is running or has elapsed time — press Start first.
Set a duration above zero — enter minutes/seconds or tap a preset before pressing Start.
Privacy & Security
100% Client-Side Execution
Timing runs locally in your browser — no data is recorded, sent, or stored anywhere.
Frequently Asked Questions
Everything you need to know about using Stopwatch & Timer
Yes — this tool is a full stopwatch with centisecond precision and unlimited lap recording showing split and total times, plus a countdown timer with an alarm.
Open the Timer tab, tap the "10 min" preset, and press Start — a triple beep sounds when the countdown ends.
Yes — timing uses wall-clock timestamps, so it stays accurate in a background tab; just keep the page open.
Browsers require one user interaction before playing audio — press Start once to enable sound, and ensure the device is not muted.
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100% free, browser-based, and private. No installation, registration, or file upload to external servers required.
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