Classroom Timer

Fullscreen classroom timer and stopwatch for teachers — a countdown with alarm sounds for the projector and smartboard.

⏱ Classroom Timer is a clean, reliable countdown timer for teachers. Open it in one click, pick the minutes, and put giant fullscreen digits on the projector — a timer for the classroom that every student can see from the back row. When time is up, the screen flashes and a school bell rings, so nobody misses the end of an activity. 🌟 Why teachers pick it 🔹 Huge digits made for projectors, smartboards and interactive whiteboards 🔹 Zero setup: no account, no sign-in, no configuration 🔹 Works completely offline — unlike online timer websites, it loads instantly even on restricted school networks 🔹 Requests no special permissions and collects no data 🎁 What you get 🔸 One-click presets: 1, 2, 3, 5, 10, 15, 20 and 30 minutes 🔸 Custom countdown: any minutes and seconds 🔸 A big fullscreen countdown timer — one click or the F key 🔸 Classroom stopwatch mode that counts up for races and challenges 🔸 4 alarm sounds: school bell, chime, gong and beep — or run it silent 🔸 A visual alert: the whole screen flashes red when time is up 🔸 The +1 min button extends time on the fly when the class needs a little more 🔸 Pause, resume and reset at any moment 🔸 Dark and light themes for bright or dimmed rooms 🔸 Remaining time stays visible in the tab title while you switch tabs 🔸 An active countdown survives a page reload — it is restored from the saved end time 🔸 Your last time, sound and theme are remembered automatically 🎯 Perfect for ✔ Timed tests, quizzes and exam practice — a fair, visible test timer ✔ Group work, learning stations and rotations ✔ Brain breaks, quiet reading and independent work ✔ Classroom games, debates and speaking practice ✔ Transitions between activities ("2 minutes to clean up!") ✔ Presentations, workshops, meetings and webinars Outside school it works just as well: workouts, cooking, board games and focus sessions at home. 🚀 How to start 1️⃣ Click the icon in the toolbar — the timer page opens 2️⃣ Tap a preset and the countdown starts instantly, or set your own minutes and seconds 3️⃣ Press F and the giant digits fill the projector screen 4️⃣ Pause, add a minute or reset at any moment 5️⃣ When time is up, the screen flashes red and the bell rings ⌨️ Keyboard shortcuts Space — pause and resume · R — reset · F — fullscreen · ↑ / ↓ — add or remove a minute 📽️ On the big screen It was built to be projected. The digits scale to the whole window, the progress bar is visible from any desk, and setting up a timer for the projector or interactive whiteboard takes exactly two clicks. For younger students it doubles as a classroom visual timer: the shrinking bar shows how much time is left before they can read the digits. In a dimmed room, switch to the dark theme — it is easy on the eyes. 📚 Quick classroom recipes 1. Warm-up: a 5 minute timer for classroom starters — pick the 5 preset and open the day with a visible countdown 2. Reading sprint: a 20 minute timer with the gong at the end — the class settles into quiet reading 3. Station rotation: open one countdown per tab and give each station its own time 4. Exit ticket: two minutes on the clock, a beep at the end — the lesson wraps up on time 5. Speaking practice: the stopwatch counts up while a student presents; press Space between speakers ❓ Questions and answers — Does the countdown keep running if I switch tabs? Yes. It is tied to the system clock, so the time stays accurate even in a background tab. — Can I run several timers at once? Yes — start it again and each one opens in its own tab, for example one per student group. — Will the alarm ring from a background tab? Yes — the bell rings even when the tab is in the background, and the screen flashes red as well. — Do I need the internet? No. Everything works offline. — Is there a stopwatch? Yes, switch to the stopwatch timer on the start screen and count up instead of down. — Can I use it outside school? Of course — it is just as handy for meetings, workshops, homework sessions and cooking. 🔒 Privacy first The extension asks for zero permissions. No analytics, no tracking, no ads, no accounts. Everything runs locally in your browser. 🏫 Made for every classroom Elementary and high school, university seminars, language lessons, tutoring, homeschooling and after-school clubs — wherever a lesson timer or a classroom countdown timer is needed, it is one click away. Many teachers keep it pinned instead of searching for a timer online every morning — and reach for it whenever the school timer on the wall is not enough. Classroom Timer does one thing well: a big, clear fullscreen countdown and classroom stopwatch your students can actually see. Install it and give your class a clear sense of time today.