Is there really no file size limit? How does this compare to WeTransfer?

Unlike WeTransfer which caps free transfers at 2GB and charges $12/month for larger files, ButterShare has zero file size limits. Files stream directly between your device and the recipient's device with 100% privacy. Because zero bytes are stored on a cloud server, you can send 10GB, 50GB, 100GB, or even larger folders without paying a dime.

Do my files ever get uploaded to your servers?

Never. There is no cloud storage, no database caching, and no file hosting. Our connection broker is only used for a split-second handshake to connect the two browsers. Once the direct connection is open, bytes stream strictly device to device. Zero bytes are ever retained anywhere.

How secure is the transfer? Can anyone intercept my files?

ButterShare uses an encrypted browser connection between the paired devices. File bytes do not sit on ButterShare cloud storage, and the room server only helps the two devices find each other.

Does the recipient need to install an app or sign up?

No. The recipient simply visits ButterShare and enters your 6-character room code (or clicks your share link). The transfer initiates immediately inside their standard web browser on any phone, tablet, or computer. No accounts, no passwords, no app installs.

Can I transfer files wirelessly between any device (Windows, Android, iPhone, Mac)?

Yes, exactly. ButterShare brings seamless, wireless device-to-device file transfer to every operating system. You can send files directly between iPhone, Android, Windows PC, Mac, and Linux with zero cables, app installs, or cloud middleman.

Can I transfer whole folders without zipping them first?

Yes. Drag and drop any folder into ButterShare. It is automatically packaged in your browser and transferred intact with its full folder directory structure preserved.

What happens if someone closes their browser tab during a transfer?

Because files stream directly between devices in real time, both browser tabs must stay open until the transfer completes. If a connection drops, ButterShare alerts you immediately with instant reconnection options. Your original files never leave your device.

Why is ButterShare completely free? What's the catch?

Because ButterShare does not host or store your files on expensive cloud servers (like AWS or Google Cloud), our operating costs are negligible. We don't have massive storage bills to pay, so we never need to charge you subscription fees or limit your file sizes.

Does ButterShare upload files to a server?

No. ButterShare only helps the two devices join the same room. Once connected, file bytes travel directly between the two browsers.

Device-to-Device File Transfer

Why ButterShare

A Simpler, Faster Way to Transfer Files

Direct file transfer connects the sender and receiver without first uploading the file to cloud storage. Instead of sending your file to Amazon S3 or Google Cloud and downloading it back down, data moves through an encrypted connection between your two devices.

Direct Browser Transfer

Encrypted Browser Transfer

Pure direct Architecture

Engineered for Maximum Speed & Privacy

No cloud storage middleman. Direct browser-to-browser streaming.

Direct Browser-to-Browser Transfer

Files move straight between the two browsers through a private encrypted connection.

Complete Data Sovereignty

Files never rest on a third-party server, eliminating data leaks and corporate surveillance.

Saturates Local Wi-Fi Speeds

When devices share a local router, transfers run at LAN speeds (often 300–800 Mbps) independent of internet upload caps.

Smart Connection Fallback

If a strict mobile or office network blocks the direct path, ButterShare can try a secure fallback path.

Streamlined 3-Step Flow

How Direct File Transfer Works

Start transferring in seconds with zero software installation.

01Step 1

Room Setup

Both devices use the room code or link to find each other securely.

02Step 2

Private Connection Opens

The browsers open an encrypted connection between the sender and receiver.

03Step 3

Files Save as They Arrive

Large files are received in small parts and saved progressively, so the browser stays responsive.

Frequently Asked Questions

Got questions? We've got answers

Everything you need to know about peer-to-peer file transfer, transfer limits, and privacy.

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Ready to Transfer Files Without Limits?

Drop any file or folder above to start an instant device-to-device stream. No accounts, no subscriptions, 100% free.

No 2GB File Limits

100% Private (0 Bytes Stored)

Every Device & Browser

Device-to-Device Transfer,Share anything. No limits.

Drop any files or folders here