How to Transfer Files Between Devices Over Local Wi-Fi (No Internet)

The Problem with Cloud File Sharing

In our daily lives, we often need to transfer files—like photos, documents, and videos—between a phone and a computer or between coworkers. The default approach for most people is to upload the file to a cloud service (like Google Drive, Dropbox, or iCloud) or send it via chat apps (like WhatsApp, Slack, or email) and then download it on the target device.

However, this traditional method has significant downsides:

• Speed Limitations: Your transfer speed is capped by your internet upload speed, which is usually much slower than your local router's capability.
• Data Waste: You are wasting mobile data or internet bandwidth to upload the file to an external server and download it back to a device sitting two feet away.
• Privacy Concerns: Your private files are stored on third-party cloud servers, increasing your vulnerability to data leaks.

The Local P2P Solution: WebRTC

WebRTC (Web Real-Time Communication) is an open-source standard that enables web browsers to establish direct, peer-to-peer (P2P) connections. When two devices on the same Wi-Fi network connect via WebRTC, they create a direct data channel between each other.

Once this connection is established, file data flows directly from the sender's browser to the receiver's browser. It does not traverse the internet, does not use external bandwidth, and is never uploaded to any cloud servers.

Benefits of WebRTC Local Transfers

1. Maximum Speed: Transfers operate at the full limit of your local Wi-Fi router (often exceeding 100 Mbps to 1 Gbps on modern Wi-Fi 6 routers).
2. No Internet Required: As long as both devices are connected to the same Wi-Fi router or local area network (LAN), the transfer will succeed, even if the building's internet connection is completely down.
3. Absolute Privacy: Since the file remains in local transit and is decrypted directly by the receiving browser, no third party can intercept or inspect your data.

How to Transfer Files Locally using SharePopa Nearby Share

With SharePopa, we have built a seamless browser-based AirDrop alternative. Here is how simple it is to use:

• Open SharePopa Nearby Share on both devices.
• Ensure both devices are connected to the same local Wi-Fi or LAN network.
• The two browsers will automatically discover each other and display a device card on the screen.
• Drag and drop the files you want to send onto the target device's card.
• Accept the transfer prompt on the receiving device. The download starts instantly.