What is StrongFolder?
StrongFolder is a peer-to-peer file transfer tool that works in the browser. Instead of uploading your files to a cloud and sending a download link, it connects your browser directly to the recipient's browser with WebRTC — the same technology browsers use for video calls. The files travel from your device to theirs while you keep the tab open.
Why send files peer-to-peer?
Cloud transfer services first upload your file to their servers, keep a copy for days, and cap the size on free plans. A direct transfer skips all three: there is no upload to wait for, no copy left behind, and no size cap from the service. The trade-off is that both devices must be online at the same time. Read the full comparison in P2P vs cloud file transfer.
Is it secure?
Every WebRTC connection is encrypted in transit with DTLS. If the two browsers cannot reach each other directly — for example behind a strict corporate firewall — the encrypted stream goes through a StrongFolder relay server that forwards it without storing it. Details: Security & privacy.
Where do I start?
Open the web app in any modern browser, or add the free Chrome extension to send with one click from the toolbar. For step-by-step instructions see How it works, and for every size and browser rule see Limits & requirements.