645 Seconds Timer
Press Space to start/pause, R to reset, F for fullscreen, ? for help.
00:10:45
Set Timer for Specified Time
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About 645 Seconds Timer
Set a 645 Seconds countdown timer for free. This online timer works offline as a PWA, supports audio alerts, keyboard shortcuts, and repeat mode.
How to use
Click the Start button to begin the countdown. Use +1m/−1m buttons to adjust time quickly, or click the timer display to set a custom duration. Press Space to pause/resume, R to reset, and F for fullscreen.
Features
- Works completely offline after first load (PWA)
- Multiple timers (add with the + button)
- Fullscreen mode for presentations and classrooms
- Repeat mode for continuous intervals
- Browser notifications (with permission)
Use cases for 645 Seconds
- Study sprints
- Team standups
- HIIT intervals
- Practice sessions
- Tutor blocks
Tips for using this timer
- Press Space to start/pause
- Press R to reset timer
- Press F for fullscreen mode
- Click the + button to add multiple timers
- Enable Repeat mode for continuous intervals