just f***ing send it

Product Introduction

1. Definition: jfsendit is a peer-to-peer (P2P) web application and direct file transfer service that enables browser-to-browser file sharing without any intermediate server storage.
2. Core Value Proposition: It provides a secure, zero-infrastructure method for one-time file transfers. The core proposition is "no upload, no server, no account," offering end-to-end encrypted, direct device-to-device file sharing for instant and private file delivery.

Main Features

1. Zero-Knowledge Peer-to-Peer Transfer: Files are transferred directly from the sender's browser to the receiver's browser using WebRTC (Web Real-Time Communication). This creates a device-to-device DTLS (Datagram Transport Layer Security) encrypted connection. The service only facilitates an initial signaling handshake to exchange connection metadata (the short code); the actual file data never passes through or is stored on any server.
2. Streamlined, Ephemeral Sharing Workflow: The system uses a one-time, short-lived numeric code or a direct link. The sender generates a code, shares it privately with the intended receiver, who enters it to establish the connection. The code is single-use and becomes invalid after one successful connection or timeout, preventing unintended access.
3. High-Volume File and Folder Streaming: There is no hard file size limit, supporting multi-gigabyte transfers. Data streams directly to the recipient's disk, so files do not need to be loaded entirely into browser memory. Sending a folder automatically packages it into a ZIP archive during transmission. The transfer can resume from the exact byte if interrupted, as long as both browser tabs remain open.

Problems Solved

1. Pain Point: Traditional file sharing methods involve slow uploads to cloud servers, account creation requirements, file size limits, and concerns over data privacy and third-party access. jfsendit eliminates these by removing the server intermediary entirely.
2. Target Audience: Privacy-conscious individuals, remote developers and designers exchanging large build files or design assets, freelancers and creative professionals (photographers, video editors) sending raw media, and IT professionals needing a quick, secure transfer without leaving a data trail.
3. Use Cases: Sending a large video project to a client without a cloud account. Securely transferring confidential documents between personal and work devices. Quickly sharing a full project folder with a colleague for review. Distributing software installers or datasets directly from one computer to another.

Unique Advantages

1. Differentiation: Unlike cloud storage (Google Drive, Dropbox) or email attachments, jfsendit is not a storage service. It is a pure, stateless transfer conduit. It differs from other P2P apps (like some BitTorrent clients) by being entirely browser-based with no software installation required and by using a one-to-one, code-based connection model for maximum simplicity and privacy.
2. Key Innovation: The key innovation is the pragmatic implementation of WebRTC for file transfer. By leveraging a technology designed for real-time communication and applying it to bulk data streaming, combined with a minimalist, code-based signaling system, it achieves secure P2P transfer with an extremely low barrier to entry and a zero-data-footprint architecture.

Frequently Asked Questions (FAQ)

1. Is jfsendit secure for sending sensitive files? Yes, all transfers are end-to-end encrypted by default using WebRTC's DTLS encryption. Since the data stream is direct between browsers and never touches a server, the service provider cannot access, scan, store, or recover your files. It is designed for maximum privacy.
2. How large of a file can I send, and what happens if the connection drops? There is no set file size limit; multi-gigabyte transfers work reliably. If the connection drops during transfer, it will automatically reconnect and resume from the exact point of interruption, provided both sender and receiver keep their browser tabs open.
3. Do I need to install any software or create an account? No. jfsendit is a free, account-free web service. You only need a modern, compatible web browser (Chrome, Firefox, Edge, or Safari). No downloads, installations, or sign-ups are required to send or receive files.
4. Why would a transfer be slow if both devices are on the same network? This is typically caused by network configuration issues forcing the traffic through the internet rather than a direct LAN (Local Area Network) path. Common solutions include: disabling VPNs on both devices, allowing Local Network access in macOS privacy settings for the browser, ensuring both devices are on the same Wi-Fi network (not a "guest" network), and checking firewall settings. The tool aims for a "LAN direct" path for optimal speed.
5. Can I send files to more than one person at a time? No. Each generated code creates a strictly one-to-one, single-use connection. The first receiver to connect with a valid code becomes the recipient, and the code is then invalidated. For multiple recipients, you must generate and share a unique code with each person.