TimerJet is a free online timer, alarm clock, and stopwatch that runs entirely in the browser. No account, nothing to install, no paywall.

Set a countdown for any duration, or start a preset in one click. Common durations like 5, 10, 25, and 30 minutes each have their own page, so you can bookmark the exact timer you use most.

A full-screen mode shows oversized digits that stay readable across a room, which makes it practical on projectors and shared screens. You can adjust the accent color, font, and digit size, and preview any alert sound before starting.

TimerJet also includes a stopwatch with lap timing and a world clock with live seconds. Timers can be embedded on other websites.

Built for classrooms, study sessions, workouts, cooking, and desk work. Available at timerjet.com.