🕐 Full Screen Clock

What can Full Screen Clock do?

Free online full screen clock tool. Switch between digital and analog clock modes, toggle 12/24 hour format, customize colors and sizes. Click the fullscreen button to enter browser fullscreen mode — perfect as a desktop clock, meeting room clock, or projection display. Pure frontend, no installation needed.

Key Features

• Dual Mode: Digital clock (large numbers) and analog clock (dial with hands), or both simultaneously
• 12/24 Hour Format: Freely switch between time formats, 12-hour shows AM/PM
• Fullscreen Display: One-click browser fullscreen mode for projection and desktop use
• Customizable Style: Adjust clock color, font size, show/hide seconds, date, and weekday
• Real-time Update: Auto-updates every second for precise time display

How to Use

1. Select clock mode (digital/analog/both) and time format (12/24 hour)

2. Customize clock color and font size

3. Toggle seconds, date, and weekday display

4. Click "Fullscreen" button to enter fullscreen mode

5. Press ESC to exit fullscreen

Use Cases

• Meeting Rooms: Project fullscreen clock for attendees to track time
• Classrooms: Exam timing, class time management
• Desktop Clock: Repurpose old monitors/tablets as desk clocks
• Live Streaming: Time reference overlay for broadcasts
• Kitchen Timer: Check time while cooking

Technical Background

The 24-hour format is the international standard (ISO 8601), avoiding AM/PM ambiguity. The 12-hour format is more common in English-speaking countries. Analog clock hands are calculated by angles: the hour hand rotates 30 degrees per hour (360/12), the minute hand 6 degrees per minute (360/60), and the second hand 6 degrees per second.

FAQ