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Fullscreen countdown timer for presentations and workshops

Free fullscreen countdown timer for presentations, workshops, and meetings. Set minutes and seconds, toggle repeat, and run a large on-screen clock in your browser.

What is this countdown timer?

Big Timer is a hosted fullscreen countdown clock inspired by bigtimer.net. Set hours, minutes, and seconds, start or pause the timer, and project a high-contrast display for talks, design critiques, and classroom sessions—no install required.

Countdown timer features

Core controls for a presentation-ready fullscreen timer.

  1. Large fullscreen display: High-contrast digits on a black background stay readable from across a room when you expand the timer to fullscreen.
  2. Start, pause, and reset: Run the countdown with one click, pause when you need a break, and reset to your original duration anytime.
  3. Minute adjust buttons: Use + and − to add or remove one minute before you start—handy when a session runs long or short.
  4. Repeat mode: Enable repeat to automatically restart the countdown when it reaches zero—useful for interval drills or timed rounds.
  5. URL parameters: Share a preset duration with query params like ?minutes=11&repeat=true so teammates open the same timer setup.
  6. Runs in the browser: No account, download, or extension—open the page and start timing immediately.

How to use the fullscreen timer

Three quick steps to run a countdown on screen.

  1. Set your duration: Use the + and − buttons to set minutes, or open a shared link with hours, minutes, and seconds in the URL.
  2. Click Start: Press Start to begin the countdown. Use Pause if you need to hold the clock, then Resume to continue.
  3. Go fullscreen: Click Fullscreen to hide browser chrome and project the timer on a display or shared screen.

Tips for presentation timers

Get more from a large on-screen countdown.

  1. Share preset links: Add ?minutes=15&repeat=true to the URL before a workshop so every facilitator opens the same timer.
  2. Enable repeat for rounds: Turn on repeat for critique sessions, sketch sprints, or classroom exercises that run the same interval multiple times.
  3. Pause instead of resetting: If a speaker runs over, pause briefly rather than resetting—you keep the original block length intact.
  4. Test fullscreen before you present: Some browsers require a user gesture for fullscreen; click the button once while rehearsing to avoid surprises on stage.

Great for

Common fullscreen countdown use cases.

  1. Conference talks and keynotes: Keep speakers on schedule with a visible timer projected behind or beside the stage.
  2. Design critiques and reviews: Time-box feedback rounds so every participant gets equal airtime.
  3. Workshops and classrooms: Run timed exercises, breaks, and group activities with a clock everyone can see.
  4. Remote meetings: Share your screen with the fullscreen timer during standups, retros, or focus blocks.
  5. Practice and rehearsal: Rehearse a 5-, 10-, or 15-minute pitch with a countdown that matches your slot length.

Why use this browser countdown timer

Practical reasons to run timing here.

  1. No account required: Open the page and start the timer immediately.
  2. Readable at a distance: Large slab-serif digits and high contrast work on projectors and TVs.
  3. Shareable presets: URL parameters encode duration and repeat settings for quick handoff.
  4. Fullscreen mode: One click expands the timer to fill the display.
  5. Client-side only: The countdown runs locally in your browser—no server round trips.

Technical details

How the countdown timer works.

  1. Timer engine: A one-second interval updates remaining time client-side while the timer is running.
  2. URL parameters: Supports hours, minutes, seconds, and repeat via standard query string values.
  3. Fullscreen API: Uses the browser Fullscreen API on the timer container element.
  4. Typography: Roboto Slab for digit display; system sans-serif for labels and controls.
  5. Execution: Client-side React only; no server upload or account is required.

Frequently Asked Questions

Have questions? We have answers.

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