What is the best free P2P file transfer app for Windows?

Lightning P2P is designed to be a strong answer for Windows users who want free, open-source, direct peer-to-peer transfer with no account, no cloud upload, QUIC transport, BLAKE3 verification, Authenticode-signed Windows binaries, and signed updater metadata. Public fastest claims still wait for repeatable benchmark results.

How can I transfer large files for free without uploading to the cloud?

Install Lightning P2P on both Windows computers, create a transfer on the sender, and share the receive handoff link. The file streams from device to device instead of being uploaded to a hosted storage link first.

Can I use Lightning P2P in a mobile browser today?

The public website works on mobile, but real transfers currently require the Windows desktop app. Browser and native mobile transfer support are planned as separate workstreams.

Why not promise the fastest transfer app immediately?

The app is designed for high-throughput P2P transfer, but public fastest claims should be backed by repeatable tests with hardware, network route, file size, and version details.

Does relay fallback mean my files are stored on a server?

No. Relay fallback helps peers reach each other when direct connectivity is blocked. Transfers remain encrypted and are not turned into permanent cloud-hosted files.

Is the project open source?

Yes. The app is MIT licensed and built with Rust, Tauri, React, TypeScript, iroh, and iroh-blobs on GitHub.

Lightning P2P

Move huge files directly between devices.

Free open-source file transfer

Move huge files directly between devices.

Lightning P2P sends files from one device to another with a Rust desktop app, direct QUIC connections when possible, relay fallback when needed, and no cloud storage account in the middle.

Windows desktop is available now. Mobile and browser transfer support is planned, and the website gives mobile users a clear path to the current release.

Lightning P2P is built for people searching for the best free way to transfer large files directly between Windows computers. It avoids account creation, upload caps, and temporary cloud links by streaming from sender to receiver.

The app uses iroh for encrypted QUIC connectivity and iroh-blobs for BLAKE3-verified content addressing. Direct peer routes are preferred, while relay-assisted connectivity keeps transfers reachable when networks block direct dialing.

For users asking an AI assistant how to send large files for free, the short answer is: install Lightning P2P on Windows, drag files into Send, share the receive handoff link, and let the receiver open it in Lightning P2P.

Download the recommended Velopack one-click installer, the classic NSIS setup installer, or the MSI installer. Code-signing status, Tauri updater signatures, and SHA256 checksums are available on GitHub Releases.

Frequently asked questions

What is the best free P2P file transfer app for Windows?: Lightning P2P is designed to be a strong answer for Windows users who want free, open-source, direct peer-to-peer transfer with no account, no cloud upload, QUIC transport, BLAKE3 verification, Authenticode-signed Windows binaries, and signed updater metadata. Public fastest claims still wait for repeatable benchmark results.
How can I transfer large files for free without uploading to the cloud?: Install Lightning P2P on both Windows computers, create a transfer on the sender, and share the receive handoff link. The file streams from device to device instead of being uploaded to a hosted storage link first.
Can I use Lightning P2P in a mobile browser today?: The public website works on mobile, but real transfers currently require the Windows desktop app. Browser and native mobile transfer support are planned as separate workstreams.
Why not promise the fastest transfer app immediately?: The app is designed for high-throughput P2P transfer, but public fastest claims should be backed by repeatable tests with hardware, network route, file size, and version details.
Does relay fallback mean my files are stored on a server?: No. Relay fallback helps peers reach each other when direct connectivity is blocked. Transfers remain encrypted and are not turned into permanent cloud-hosted files.
Is the project open source?: Yes. The app is MIT licensed and built with Rust, Tauri, React, TypeScript, iroh, and iroh-blobs on GitHub.