Last updated: 2026-07-09
Macs and PCs don't speak the same file-sharing language out of the box. AirDrop is Apple-only, Windows' network sharing wants both machines on a matching workgroup or domain, and neither one is exactly friendly to set up in five minutes when you just want to move one folder of project files from a MacBook to a Windows desktop.
Relayium sidesteps the whole compatibility question. Open the same page in a browser on the Mac and on the Windows PC, and the files travel directly between them — end-to-end encrypted, nothing to install on either operating system. On the same network no account is needed at all; sending across the internet with a pairing code only asks the sender to sign in. Here's exactly how it works in both directions.
Nothing to install on the Mac or the PC. On the same network there is nothing to sign up for either — the browser handles everything.
If both computers are on the same office or home network, this is the fastest way to move files — no shared drive to mount, no permissions to fight with.
Working from home while the other machine is in the office, or just on a different Wi-Fi network? A pairing code connects a Mac and a Windows PC across the internet, not just across the room.
The sending computer generates a short pairing code (or a share link); enter it on the other machine to connect. The transfer still goes directly peer-to-peer whenever a direct path is possible, and falls back to an encrypted TURN relay — which only ever sees ciphertext — when it isn't. If the connection drops partway through a large folder, it resumes instead of starting over. This mode needs the sender to sign in; whoever is receiving never needs an account.
Moving a project folder from Mac to Windows (or back) usually means zipping it first. Relayium can send a folder directly, keeping its structure intact.
Relayium isn't the only option — here are the honest trade-offs of the usual alternatives:
No. Relayium transfers the original bytes exactly as they are — no re-compression, no reformatting, no line-ending or filename changes between the two operating systems.
Every file is checked end-to-end with a SHA-256 hash, so what lands on the Windows PC (or the Mac) is verified identical to what left the other machine. Large files are handled well too: Chrome and Edge stream the download straight to disk with no size cap, while Firefox and Safari buffer in memory, so on those keep a single transfer under roughly 200 MB.
No. Relayium runs entirely in the browser on both macOS and Windows. Open relayium.com on each machine and you're ready — nothing to download either way. On the same network a transfer needs no account at all; pairing across the internet only asks the sender to sign in.
No. Being on the same network is the fastest path because the two machines find each other automatically, but a pairing code connects a Mac and a Windows PC across the internet just as well — even from different cities. Either way the transfer stays end-to-end encrypted; the cross-network route just asks the sender to sign in first, and the receiver never needs an account.
Yes. Drag in a folder and Relayium sends up to 1,000 files in the batch, preserving the folder structure. Chrome and Edge on Windows write it straight into a chosen directory; if the receiving browser can't write folders directly, it arrives as a single .zip with the same layout.
No. Relayium moves the exact bytes of each file and verifies them with a SHA-256 hash end-to-end — it doesn't touch line endings, encoding, or filenames. Anything an application-level conversion would need to handle (like CRLF vs LF in a text file) is unchanged because the file itself is unchanged.
Up to 1,000 files per batch. There's no server-side size cap for a direct transfer — Chrome and Edge stream straight to disk — but Firefox and Safari buffer in memory, so keep individual transfers on those under about 200 MB.
Open Relayium on your Mac and your Windows PC and move your first files across — no install, and no account needed on the same network.
Try Relayium now