Two computers, one desk: a work laptop and a personal machine, or a Mac and a gaming PC. A KVM switch lets both share the same monitor, keyboard, mouse and webcam, so you switch between them with a button press instead of replugging cables. This guide explains the options — including the one built into many monitors — and how to avoid the classic KVM headaches.
Quick answer
- Your monitor has a built-in KVM: use it. It’s free and usually the cleanest solution.
- Two USB-C laptops: a USB-C KVM dock — one cable per laptop carries video, data and charging.
- A desktop plus a laptop, or high refresh gaming: a dedicated DisplayPort KVM switch.
- You only need one keyboard and mouse (not the monitor): software like Logitech Flow, Barrier or Synergy, or a mouse with multi-device switching.
Option 1: your monitor may already do it
Many business monitors — Dell UltraSharp, BenQ, LG and others — include a KVM feature. You connect both computers for video, plug the keyboard and mouse into the monitor’s USB hub, and the monitor switches the USB devices along with the video input. Some switch automatically with the input; others use an on-screen menu or a hotkey.
Check your monitor’s manual for “KVM” before buying anything. Our Dell UltraSharp U2723QE review covers a popular model with this feature.
Option 2: a USB-C KVM dock
If both machines have USB-C with video output, a dual-host USB-C dock is the most elegant setup: one cable per computer, each carrying video, USB and power delivery. Press a button and the monitors, keyboard, mouse, webcam and Ethernet all move to the other machine — which is exactly what a hybrid worker wants when the work laptop goes back in the bag at 6pm.
Check: how many displays it supports per host, charging wattage for each port, and whether your computers support DisplayPort Alt Mode. Macs have chip-level display limits — see USB-C hub vs. Thunderbolt dock.
Option 3: a dedicated KVM switch
A box that sits between your computers and your peripherals. Best when one machine is a desktop, when you need high refresh rates, or when you want a physical button on the desk. Brands commonly recommended include TESmart, UGREEN, Kensington and Level1Techs (for high-bandwidth setups).
Match the bandwidth
| Your display | What the KVM needs |
|---|---|
| 4K at 60Hz | HDMI 2.0 or DisplayPort 1.2 and up |
| 1440p at 144–165Hz | DisplayPort 1.4 |
| 4K at 120–144Hz | DisplayPort 1.4 with DSC, or HDMI 2.1 — check carefully |
| Two monitors | A dual-monitor KVM, not a single-head model |
Also check the USB side: a USB 2.0 KVM is fine for keyboard and mouse but not for a webcam, external SSD or audio interface. Look for USB 3.0/3.2 ports if you share those.
Common KVM headaches (and fixes)
- Windows rearrange when you switch: the computer sees the display disconnect. Some KVMs have EDID emulation to prevent this — look for it explicitly. Tools like Microsoft PowerToys can also restore window layouts.
- Keyboard hotkeys don’t work: many keyboards with their own hubs or wireless receivers confuse KVMs. Plug the receiver directly into the KVM’s dedicated keyboard port.
- Audio switches oddly: use the monitor’s audio out, or a separate DAC per machine.
- Cheap cables: most “it doesn’t work at full resolution” problems are the cable. Use certified DisplayPort or HDMI cables of the right version.
The software alternative
If each computer has its own screen — a laptop next to a desktop, for instance — you may not need a KVM at all. Logitech Flow (built into mice like the MX Master 3S) and open-source Barrier let one keyboard and mouse move between machines across the network, with clipboard sharing. No video switching, but zero hardware.