TransmitFlow

What it does

TransmitFlow is an open-source way to send files directly between devices in your browser—no account and no cloud upload step. Pair with QR code or room code, then transfer instantly with WebRTC and automatic fallback on restrictive networks. Built for reliability with adaptive chunking, missing-chunk recovery, SHA-256 integrity checks, and clear retry states. Works on desktop and mobile.

Private peer-to-peer file transfer with WebRTC. No account, no cloud upload step, direct device-to-device sharing.

TransmitFlow opens a direct WebRTC connection between two browsers, like sending mail airmail instead of through a sorting depot. Nothing sits on a server in between. Drop files or click to browse. Any file type, up to 20 GB per transfer. Files travel directly between devices over a WebRTC data channel. No relay server ever touches your data — as direct as handing over a USB drive, but over the internet. Your files never touch a server, so there is nothing for anyone to see, store, or track. DTLS/SRTP secures the data channel, and each room is an isolated session with a one-time code. Adaptive chunking streams files at a size that fits the connection, up to 20 GB total per session (10 GB…from transmitflow.fun

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