Last updated: 2026-07-09
If two or more devices are on the same Wi-Fi or local network, sending a file between them should not require an account, a code, or a trip through the cloud. Relayium detects when devices share a network and lets them connect directly, in the browser, with nothing to sign up for.
This guide covers the generic same-network case — any devices, any operating systems, even more than two at once. If you have a specific device pair in mind, see the dedicated guides for PC to phone, Mac to Windows, or an AirDrop-style flow for Windows/Linux/Android linked at the end.
Relayium does not ask you to type anything to find nearby devices. When your browser opens relayium.com without a pairing code, the server places you in a room based on the network you are connecting from — in practice, devices that share the same public IP address (the same home, office, or campus Wi-Fi, or the same mobile hotspot) land in the same room automatically.
That room is not capped at two participants: it holds however many devices open the site from that network, so a whole desk of laptops or a classroom of phones can all see each other at once, not just a single pair.
The whole flow happens in the browser — no app to install on any device.
Because both devices are already on the same network, Relayium connects them peer-to-peer directly — the bytes travel from one device to the other over your local Wi-Fi and never make a round trip to a Relayium server. There is nothing to upload and nothing to wait on downloading; speed is bounded only by your local network, which is usually much faster than an internet connection in either direction.
This is also why no account is involved on either side: with everyone already on the same trusted network, Relayium does not need sign-in to know who should be allowed to connect to whom.
Being on the same network does not mean the transfer is sent in the clear. Relayium negotiates an X25519 key exchange between the two devices and encrypts every chunk with AES-256-GCM; that key is never seen by any server, including Relayium's own signaling server, which only helps the devices find each other. The short verification code (SAS) both screens display lets you visually confirm the connection is genuinely between your two devices, and each file is checked end to end with a SHA-256 hash so you know it arrived byte-for-byte intact.
Same-network mode only works when the devices actually share a network — a phone on mobile data, a laptop on a different Wi-Fi, or a device behind a different router will not show up automatically. For that case, Relayium also supports connecting across networks with a short pairing code: the sender signs in to generate the code (or a QR code / link), the receiver never needs an account, and the transfer still connects directly, peer-to-peer, whenever the networks allow it — falling back to an encrypted relay only when a direct path is not possible.
No. Same-network transfers need no account and no pairing code on either side — just open relayium.com on each device.
Devices that connect from the same network typically share the same public IP address, and Relayium groups devices with a matching public IP into the same room automatically, with no code required.
Yes. Same-network rooms are not limited to a pair — every device that opens relayium.com from that network can appear and receive files, useful for sharing with several people in the same room or office.
Yes. Every same-network transfer uses the same X25519 key exchange and AES-256-GCM encryption as a cross-network one, with a verification code you can check yourself and a SHA-256 integrity check per file.
They are not on the same network, so automatic discovery will not connect them. Use a pairing code instead — the sender signs in to create it, the receiver does not need an account, and the two devices still connect directly.
Open Relayium on any two (or more) devices on the same Wi-Fi and send your first file — no account, no code needed.
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