ButterShare is a web app that lets you send any file or folder of any size directly between devices using an encrypted WebRTC connection. No accounts, no cloud upload, and end‑to‑end encryption keep transfers private and instant. Works on Windows, macOS, Linux, iOS, Android and any modern browser.
Problem
Transferring large files often means dealing with cloud storage limits, upload queues, account sign‑ups, and privacy concerns. Services like WeTransfer cap file size, require registration, and store data on their servers, creating security and cost issues for professionals and everyday users who need fast, unlimited, private file sharing.
Solution
ButterShare uses peer‑to‑peer WebRTC streaming with the browser's Origin Private File System to move data directly between two devices. Files never touch a server; when a direct path fails an encrypted TURN relay is used. The service provides share links, QR codes, or room codes, works across all major OSes and browsers, and offers resumable transfers without any subscription.
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