Brynhildr (formerly Zero Remote) is a free, portable remote desktop application for Windows that bundles both a client and server in a single sub-1MB executable. It uses a custom video codec for fast screen transfer and supports encrypted connections, audio transmission, clipboard sharing, file transfer, and multi-monitor sessions - all without installation or a cloud relay server. The current version is 3.6.2.
Quick summary: Run the executable in server mode on the remote PC (set a port and password), run it in client mode on your local machine, enter the remote IP and port, and connect. No accounts, no vendor servers, no session limits. On a LAN this is immediate. Across the internet, port forwarding or a VPN is required on the remote side.
Brynhildr | Free Portable Remote Desktop Program
Ideal for users who need remote access on the move, Brynhildr supports both connecting to and hosting remote desktop sessions - enabling secure access to desktops, applications, and files from virtually anywhere. Because it requires no installation and weighs under 1 MB, it fits comfortably on a USB flash drive alongside other portable tools.
Unlike cloud-relay tools such as TeamViewer or AnyDesk, Brynhildr connects directly between two machines using a specified IP address and port - with no intermediary server, no account required, no usage limits, and no telemetry. This is its key advantage for users who want full control over their remote sessions, and its key limitation for users who need easy cross-internet access without network configuration.
Brynhildr Remote Desktop - Client and Server in One
Brynhildr combines both a remote desktop client and server in the same executable, allowing management of both functions from one interface. The server side listens on a configured port and password; the client side connects to a remote server by IP and port. Both run from the same file - no separate install for each role.
Key Features
- Custom Video Codec: Uses a proprietary compression engine to push screen updates faster than VNC, with performance competitive with AnyDesk on local networks.
- Encrypted Connections: All sessions are encrypted to protect data in transit.
- No Account or Cloud Server Required: Connects directly by IP and port - no vendor relay, no session IDs, no usage limits.
- Audio Transmission: Streams audio from the remote machine to the client, useful for diagnosing audio issues or monitoring media playback.
- Clipboard Sharing: Copy and paste text between local and remote machines seamlessly.
- File Transfer: Transfer files between local and remote machines within the session.
- Multi-Monitor Support: Access and switch between multiple displays on the remote machine.
- Screen Sharing: Share your screen for collaboration, remote support, or presentations.
- Minimal Resource Usage: Lightweight enough to run efficiently on older hardware.
- Fully Portable: Single executable under 1 MB - runs from a USB drive with no installation and no system footprint.
- iOS Client Available: A Brynhildr iOS app is available for controlling a Windows PC from an iPhone or iPad on the same local network.
How to Use Brynhildr
On the remote machine (server side):
- Copy
brynhildr.exeto the remote PC - via USB, file share, or download. - Run it as Administrator (required to capture the screen and input).
- Select Server mode, set a port number and password, and click Start.
- Note the machine's local IP address (run
ipconfigin Command Prompt if needed).
On your local machine (client side):
- Run
brynhildr.exeand select Client mode. - Enter the remote machine's IP address, the port number you set, and the password.
- Click Connect.
Note: To run the remote desktop server as a persistent Windows service, create a brynhildr folder on your system drive (e.g., C:\brynhildr), copy the extracted files there, then right-click the executable and select Run as Administrator.
LAN vs. Internet Access
Brynhildr works immediately on a local network - both machines share the same network and the IP address is directly reachable. Across the internet, the remote machine must be reachable from outside the local network, which typically requires one of the following:
- Port forwarding on the remote router - forward the chosen port to the remote machine's local IP
- VPN - put both machines on the same virtual private network (e.g. WireGuard, Tailscale) so they can reach each other as if on a LAN
- Public IP on the remote machine - less common on residential connections due to NAT and carrier-grade NAT
If you need easy cross-internet remote access without network configuration, cloud-relay alternatives like RustDesk (open source, free) or AnyDesk are more practical for that scenario.
Specifications | Official Site | Download
- Author's Website: Project Page
- Creator: IchiGeki
- Current Version: 3.6.2
- License: Open Source (personal use)
- Supported Operating Systems: Windows 11, 10, 8, 7, Vista, XP, Windows Server
- Minimum System Requirements: Dual-core CPU, 512 MB RAM
- Editor Rating: 4 star
- Extracted File Size: < 1 MB
- Downloading: Brynhildr Download
Frequently Asked Questions
What is Brynhildr used for?
Brynhildr is a portable remote desktop tool for Windows. It lets you control another Windows computer remotely - accessing its screen, keyboard, mouse, files, and audio - from your own machine, with no cloud relay server in the middle. It is commonly used by IT technicians, developers, and anyone who needs remote access without relying on commercial services.
Do I need to install Brynhildr?
No installation is required. The software is fully portable and runs directly from the executable - from a USB drive, network share, or any folder on either machine.
Is Brynhildr secure?
Yes - all connections are encrypted. Because Brynhildr connects directly between two machines without going through a third-party server, there is no vendor in the middle with access to your session data. Use a strong password and, where possible, connect over a VPN for additional security.
Does it work across the internet (not just on a local network)?
On a local network it works immediately. Across the internet, the remote machine must be reachable from outside - which typically requires port forwarding on the remote router, a VPN connecting both machines, or a public IP. This is the main limitation compared to cloud-relay tools like TeamViewer or RustDesk.
How does Brynhildr compare to TeamViewer or AnyDesk?
Brynhildr has no accounts, no usage limits, no cloud relay, and no telemetry - and it is significantly smaller. The tradeoff is that internet access requires network configuration (port forwarding or VPN). TeamViewer and AnyDesk handle NAT traversal and cross-internet connectivity automatically through their own servers, making them easier for one-off remote support sessions. RustDesk is a free, open source alternative that offers the relay-based ease of TeamViewer without the commercial licensing restrictions.
Can Brynhildr run on older hardware?
Yes. It is designed to use minimal resources and runs on older Windows machines with a dual-core CPU and 512 MB RAM.
Is it still being developed?
Yes. Version 3.6.2 confirms the project remains active. Development continues by the original developer, IchiGeki, with updates available from the official project page.
Final Thoughts
Brynhildr is a lightweight, portable, and fully featured remote desktop solution for users who want direct machine-to-machine access without cloud relay servers, mandatory accounts, or commercial licensing. Its custom video codec delivers fast screen transfer, and its single-executable design - under 1 MB, no installation - makes it a natural fit for USB toolkits and on-the-go IT work.
The key consideration is connectivity: on a LAN it is effortless, but cross-internet access requires port forwarding or a VPN. If that configuration is practical for your setup, Brynhildr is one of the best free remote desktop options available. If you need transparent cross-internet access without network configuration, pair it with a VPN like Tailscale or WireGuard, or consider RustDesk as a cloud relay alternative that is also free and open source.
