Open-Source Encrypted File Transfer
Send files directly between browsers or to the desktop app. End-to-end encrypted, peer-to-peer, no servers. Built on the Bolt Protocol.
Drop files here
or click to select files
How It Works
Start sharing files in seconds. Browser or desktop app, no accounts needed.
Open on Both Devices
Visit localbolt.app in a browser or use the desktop app. Same network or different networks.
Select a Device
Devices appear automatically. Tap one to send an encrypted connection request.
Transfer Directly
Drag and drop files. End-to-end encrypted, peer-to-peer, no size limits.
Open-Source Security, Zero Trust by Design
LocalBolt uses NaCl/Curve25519 encryption to transfer files directly between devices with zero server storage. The entire stack — from the Bolt Protocol to the cryptographic SDK — is open source.
End-to-End Encryption
Every file is encrypted with NaCl/Curve25519 (same algorithms used by Signal and WireGuard) before transfer. Per-chunk random nonces prevent any pattern analysis. Built on the open-source Bolt Protocol.
Direct P2P Transfer
Files transfer directly between devices over encrypted WebRTC data channels. Browser-to-browser or browser-to-desktop-app. Faster and more private than cloud uploads.
Zero Server Storage
Your files never touch any server. Not during transfer, not after. Zero cloud storage means zero data exposure.
Browser & Desktop App
Use localbolt.app in any browser or download the native desktop app for macOS 14+: Apple Silicon · Intel. Ad-hoc signed — right-click → Open on first launch. Release notes & checksums
Fully Open Source
Source code, protocol spec, and cryptographic SDK are all public on GitHub. Audit the code, self-host your own instance, or build on top of bolt-core-sdk.
Lightning Fast
Direct peer connections transfer at local network speed. Same-network transfers never leave your LAN.
Works Everywhere
Same network or different networks. Dual signaling discovers devices both locally and across the internet. No account needed.
Real-time Transfer
Live progress tracking, transfer speed monitoring, and pause/resume control.
FAQ
Common questions about encrypted peer-to-peer file transfer
How do I send large files without email?
Open LocalBolt on both devices. They can be on the same network or different networks. Devices appear automatically. Tap to connect, then drag and drop files to transfer directly with no account required.
Is LocalBolt safer than WeTransfer or Google Drive?
Significantly. WeTransfer and Google Drive store your files on their servers. LocalBolt transfers files directly between your devices using NaCl/Curve25519 encryption (the same standard used by Signal and WireGuard). Your files never touch any server. Not during transfer, not after.
Does LocalBolt work like AirDrop on Windows and Android?
Yes. LocalBolt works in modern browsers on Windows, macOS, Linux, Android, and iOS. Unlike AirDrop, it also works across different networks, not just devices near you.
How do I transfer files between iPhone and Android?
Open localbolt.app on both devices. They will discover each other automatically. Tap the device to connect, then send files directly between iPhone and Android from the browser.
Do I need to create an account?
No account is needed. LocalBolt works instantly in your browser with zero signup. Just open the website and start sharing. No email, no password, no personal information required.
What's the maximum file size I can send?
LocalBolt does not enforce a file size cap. Practical limits are your device storage, memory, and network quality.
Does LocalBolt work without internet?
Yes. LocalBolt ships its own signaling server. When you self-host or run the desktop app, devices on your local network find each other with no internet connection needed. When internet is available, the same signaling server running in the cloud also lets you discover and transfer files to devices on other networks. Both local and cloud discovery happen at the same time, so you always see every reachable device.
Can I self-host LocalBolt?
Yes. LocalBolt is fully open source. Clone the repo from GitHub, run the start script, and you have your own private instance with its own signaling server. Works offline on your LAN with no internet required.
Is LocalBolt open source?
Yes. LocalBolt is fully open source, built on the Bolt Protocol and bolt-core-sdk. The source code, protocol specification, and cryptographic SDK are all publicly available on GitHub. You can audit the code, self-host your own instance, or build on top of the SDK.
Does LocalBolt have a desktop app?
Yes. LocalBolt has a native macOS desktop app that connects directly with browser users. Open localbolt.app in your browser on one device and use the desktop app on another — they discover each other automatically and transfer files with the same end-to-end encryption.