Yes — you can share a mouse and keyboard between two computers using free or paid software that sends inputs over your local network, no hardware switch required.
- Both computers are on the same LAN
- Software is installed on both machines (Synergy, ShareMouse, Deskflow, Mouse Without Borders)
- OS is Windows 10+, macOS 11+, or a supported Linux distro
- Firewall allows the app’s required ports
- Computers are on different networks or VPN blocks discovery
- OS version is unsupported or too old
- Firewall blocks the software’s communication ports
- Network is unstable, causing noticeable input lag
How It Works
Instead of a physical KVM switch, software solutions turn one computer into a “server” that owns the mouse and keyboard, and the other into a “client” that receives input signals over your local network. You move the cursor to the edge of one screen and it seamlessly continues on the other — no extra cables needed.
Popular tools include Deskflow (open-source), Synergy, ShareMouse, and Microsoft’s Mouse Without Borders (Windows only, free). Most support cross-platform use between Windows, macOS, and Linux.
Common Software Options
| Tool | Works? | Cost | Note |
|---|---|---|---|
| Deskflow | Yes | Free | Open-source, cross-platform |
| Synergy | Yes | Paid | Windows, macOS, Linux |
| ShareMouse | Yes | Free/Paid | Windows and macOS only |
| Mouse Without Borders | Yes | Free | Windows only, up to 4 PCs |
What You Need to Set Up
- Both computers connected to the same Wi-Fi or wired LAN
- The same software installed on both machines
- One machine designated as the server, one as the client
- Firewall rules adjusted to allow the app’s ports
- TLS/SSL encryption enabled if your software supports it, for security
When It Fails
The most common issue is network discovery failing — usually because a firewall is blocking the port, or the two machines are on different subnets. VPNs can also interfere by routing traffic away from the local network. If you see lag, switch to a wired Ethernet connection on at least the server machine.
If you also need to share a single monitor, you’ll need a physical KVM switch or a video-capable adapter. For more on video output options, see our guide on whether USB-C can connect to HDMI. And if your display setup isn’t cooperating, check why USB-C to HDMI stops working for troubleshooting steps.
Quick Tips
- Use a wired LAN connection for the lowest input lag
- Enable encryption in the software settings to keep keystrokes private
- Check both machines’ firewalls if discovery fails
- Mouse Without Borders is the easiest option for Windows-only setups
Bottom line: Sharing a mouse and keyboard between two computers is straightforward with the right software and a stable local network. Pick a tool that matches your OS combination, open the necessary firewall ports, and you’ll have seamless control across both machines in minutes.