Free 20-minute timer online. Perfect for power naps, focused reading and timed tasks. Audio alarm on completion — no sign-up needed.
The optimal nap duration — restorative without sleep inertia
One article, chapter section or research paper
Timed pool interval
Most homemade pizzas at high heat
Timed ideation session before narrowing down
The live timer above starts directly on this page — press START and the 20 minutes countdown begins immediately. An audio alarm fires when it reaches zero.
For the full experience with fullscreen mode and theme options, open GlowClock's timer tab, enter 20 minutes and press F11 to go fullscreen. The large glowing display is clearly visible across a room — ideal for classrooms, gyms and presentations.
Yes. Keep the GlowClock tab open and the alarm will fire even when you're in another tab. Make sure your device volume is on and the browser isn't suspended (this can happen on mobile when the screen locks).
Yes. Open glow-clock.com, set 20 minutes in the Timer tab and press F11. The countdown fills your entire screen in large, high-contrast text.
Yes. A clear audio alarm sounds when the 20 minutes countdown reaches zero. The alarm repeats until you dismiss it so you won't miss it.
Yes. Press Pause on the live timer above, or use the Pause button in the GlowClock app. Press Start again to resume from where it stopped.
Audio alarm · Fullscreen · No sign-up · Works on any device
Open Full Timer App