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Online Timer
Enter hours, minutes and seconds, then start. Pause and resume keep the remaining time, and presets cover common lengths.
The timer tracks a stored end timestamp, so it stays honest if the tab sleeps.
Questions
Does the timer keep working in a background tab?
Yes, in effect. It tracks a stored end time, so the display corrects itself when you return to the tab.
Do I need an account?
No. The timer runs entirely in your browser.