LayerLink Screen Sharing
Secure, browser-to-browser screen broadcasting via WebRTC technology.
Secure, browser-to-browser screen broadcasting via WebRTC technology.
Share this secure link with your viewer:
The link this page generates opens the LayerLink viewer on the other person's device; that page documents what a session ID actually grants, how quality adapts to the connection, and what to check when a session will not start.
LayerLink utilizes WebRTC (Web Real-Time Communication) to establish a secure, peer-to-peer (P2P) connection directly between your browser and the viewer's browser. Once the initial handshake is completed, video data flows directly between the two devices without passing through a centralized server.
Share your screen instantly with clients or stakeholders without forcing them to download external applications like Zoom or Microsoft Teams.
Broadcast your IDE securely to a colleague. Because the connection is P2P, the latency is significantly lower than traditional cloud-routed video software.
Share highly sensitive internal dashboards or server logs with remote IT staff, knowing the video stream is encrypted end-to-end and unrecorded.
Test the dynamic UI state handling of the LayerLink terminal without initializing hardware media streams. (Safe for mobile testing).
The core JavaScript API required to capture a screen stream (navigator.mediaDevices.getDisplayMedia) is intentionally restricted by Apple and Google on mobile operating systems for security reasons. While a mobile device can view the stream, only a desktop/laptop environment can host it.
Firebase Realtime Database acts purely as the "Signaling Server." In order for a P2P connection to occur, both browsers need to exchange connection data (SDP offers and ICE candidates) so they know how to find each other on the internet. Once the connection is established, Firebase's job is done.
No, this architecture is strictly a 1-to-1 P2P connection. Scaling WebRTC to multiple viewers requires an SFU (Selective Forwarding Unit) server to process and distribute the video streams, which breaks the zero-trust P2P model used here.
Two browsers cannot simply find each other. Both are typically behind NAT with no publicly reachable address, so WebRTC solves this in stages — and understanding them explains both the privacy properties and the occasional failure:
getDisplayMedia() asks the operating system for a screen, window or tab. The browser, not the page, renders that permission prompt.Screen capture is deliberately unavailable to web pages on iOS and unreliable on Android — the operating systems do not expose it. So hosting a session requires a desktop browser. Viewing one works on any modern device, since receiving a video stream needs no special permission.
This is a direct peer connection, not a broadcast. Serving many viewers from one sender requires an SFU — a media server that receives the stream and redistributes it — which necessarily means your video passes through infrastructure rather than going peer to peer.
Symmetric NAT and restrictive corporate firewalls can block every direct path. Without a TURN relay the connection simply does not establish. If a session fails on a corporate network but works on a home one, this is almost always why.
Screen sharing leaks more than people intend, and the mistakes are consistent enough to be worth listing:
.env file open in another tab, is visible the moment you switch to it.LayerLink is the one tool on this site that is not purely local, and it is badged Cloud API for that reason. What we can say precisely: the video stream travels directly between the two browsers and is encrypted in transit; the signalling service sees only the connection metadata required to introduce the peers, never media. What we do not claim is that this is equivalent to the fully offline guarantee the other tools make — it is a different and weaker property, and the badge exists so you know which you are getting before you click.