Big-screen broadcast
⏱ 3 min · updated May 22 · by Sophie B.
Plug the room screen via HDMI
In short
The most reliable method of all: an HDMI cable from your computer to the projector or TV. No Wi-Fi required, no risk of cut-outs.
1 Why pick HDMI
Ask 10 seasoned hosts what they use and 9 will say "HDMI". Here's why:
✅ HDMI
- No dependency on Wi-Fi
- Perfect image and sound
- Zero latency
- Works in 100% of cases
⚠️ Cast / AirPlay
- Depends on local Wi-Fi
- 1 to 3 seconds of latency
- Possible cut-outs
- Doesn't work on Firefox / Safari (Cast)
2 On Mac
1
Plug the cable
USB-C → HDMI adapter if you have a recent Mac.
2
Open System Settings
→ Displays → Arrangement.
3
Pick the mode
Mirror (same content) or Extended desktop (two distinct screens).
4
Go full-screen
On the projected screen, shortcut ⌃⌘F for Safari/Chrome.
Mac tip
In extended mode, keep the host console on your screen and drag the room screen to the projected one. You see both at once.
3 On Windows
1
Plug the cable
Direct HDMI if you have a port, or USB-C / DisplayPort adapter otherwise.
2
Windows + P
The projection panel opens on the right of the screen.
3
Choose "Extend"
Recommended. "Duplicate" forces the same resolution on both screens, which can hurt quality.
4
Full screen with F11
In the browser, on the projected window.
4 Which adapter?
Recent Macs (2017+): USB-C to HDMI adapter. €15-25, any serious brand will do.
Ultra-portable PCs: Often USB-C or Mini-DisplayPort. Check your PC's output before buying.
Did you know?
Beyond 10 metres of HDMI cable, the signal can degrade. For a large room, use an active cable (with built-in amplifier) or an HDMI-over-Ethernet extender.
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