Guide · webrtc video call explained

How WebRTC Powers Browser Video Calls

A practical explanation of WebRTC, browser camera permissions, peer connections, screen sharing, and why modern meetings can work without an app.

Published May 18, 2026 Updated May 18, 2026 1 min read By The Instant Free Meeting Team Browser Video Meetings

WebRTC is the browser technology that lets websites send real-time audio, video, and data. It is why a meeting link can open in Chrome, Edge, Safari, or Firefox without forcing a guest to install a separate app.

TL;DR

  • WebRTC gives browsers real-time audio/video capabilities.
  • getUserMedia asks for camera and microphone access.
  • getDisplayMedia is commonly used for browser screen sharing.

The simple version

A browser video call usually has four pieces:

  1. The webpage that guests open.
  2. Browser permission for camera and microphone.
  3. A signaling flow that helps participants find each other.
  4. A media path for sending audio and video.

The user only sees the first two pieces. The rest should be invisible when the product works well.

Why browsers ask for permission

Browsers do not let arbitrary websites use a camera or microphone silently. The page has to call browser APIs, and the browser prompts the user for permission.

That is why most browser meeting issues start with the same fix: check the camera and microphone permission near the address bar.

Peer-to-peer vs server-routed calls

Some WebRTC calls send media directly between participants. Others route media through servers to support more participants, recording, reliability, or network traversal.

The product choice matters more than the acronym. A good browser meeting should handle the hard parts without making the guest learn networking.

Screen sharing

Browser screen sharing generally uses getDisplayMedia, which lets a user pick a screen, window, or tab. Desktop browser support is much stronger than mobile browser support.

Frequently asked questions

Is WebRTC only for video?

No. WebRTC supports real-time audio, video, and data channels.

Does WebRTC require a server?

Real products usually need servers for signaling, routing, authentication, or TURN relay. "Peer-to-peer" does not mean "no infrastructure."

Is WebRTC secure?

WebRTC includes security requirements, but safety still depends on the product's room controls, link handling, server design, and user behavior.

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