We may earn a commission from links on this page.If you've got the funds and the need for more than one computer on your desk, then you may well want to use the same mouse and keyboard for both of them. It's more convenient if you're switching between systems, and it means you can find a keyboard and mouse combination you love and stick to it throughout.This is particularly helpful if you're working on a laptop and a desktop in tandem. Even the best laptops tend to have cramped keyboards, just through the limitations of the form factor, and a mouse is often preferable to a trackpad for several tasks (such as detailed image or video editing).Sharing your mouse and keyboard between computers is actually easier than you might think—and certainly a lot easier than it was several years ago. You've got different options available depending on the different platforms you're dealing with, and these are the tools for the job I'd recommend right now.If you're on Windows, use Mouse Without BordersMouse Without Borders is an official Microsoft program, but one of those official Microsoft programs that's more like a side project. It lets you control up to four computers using the same mouse and keyboard, as long as they're all running Windows.You don't need any complicated cabling or software setup: You just need the application installed on all the Windows computers you want to connect, and a mouse and keyboard plugged into one of them. On the first computer you set up the tool on, you'll be able to generate a code you can use to connect other computers. Mouse Without Borders on Windows. Credit: Lifehacker The main configuration screen lets you set the layout for your various Windows machines, which is important—to move from one system to another, you just drag the mouse cursor off the edge of one screen and on to another. The mouse and keyboard will interact with whatever computer the mouse cursor is currently active on.Mouse Without Borders also lets you create a universal, shared clipboard across every computer it's installed on, for easy transfer of files, text, and images. Note that Mouse Without Borders is also available as part of Microsoft PowerToys, a bundle of utilities that gives you a plethora of additional features and tweaks for Microsoft's operating system.If you're on macOS, use Universal ControlIf you're using two or more Macs together, Universal Control is the way to go for your keyboard- and mouse-sharing needs. The functionality is built right into macOS (and iPadOS), and works pretty seamlessly out of the box. Plus, it includes a lot more than the sharing of input devices.All you need is the latest version of macOS installed across your computers, the same Apple account linked to them all, and the mouse and keyboard you want to use as your main controllers. All your devices must have wifi and Bluetooth turned on, and your computers have to be fairly close together (as in, in the same room). Universal Control on macOS. Credit: Lifehacker You can find the relevant settings for this part of Universal Control by opening the Apple menu (top left), then choosing System Settings > Displays > Advanced—for best results, make sure every option here is enabled. With this done on every Mac, all that you need to do is push the mouse cursor through the left or right edge of the screen on your current Mac to switch control to the other one, depending on how they're positioned.This positioning can be tweaked via System Settings > Displays > Arrange, if needed. Universal Control goes beyond peripheral sharing, too—you can drag files across the screen edge border to transfer them between computers. You'll also find there's a shared clipboard available across your linked devices—so you can copy on one computer, and paste on the other.If you're on both Windows and macOS, use SynergyFor those bold enough to try and use both Windows and macOS machines on a regular basis, Synergy is the most comprehensive mouse and keyboard sharing software that I've come across. Once you've got it installed on every computer you want to connect, you can share a mouse and keyboard between all of them.When you've got the desktop client up and running, you're greeted with a straightforward interface that lets you manage all of the various options the program offers: You can set up how your computers are positioned in relation to each other, for example, and configure how the shared clipboard will work across different systems. Synergy on Windows. Credit: Lifehacker The Synergy app should be able to automatically add other computers with Synergy installed that are on your network, but you can do this manually too. Via the Screen layout tab you can customize how your screens are positioned, and designate the primary computer (connected to the keyboard and mouse you want to use). You can then just move the mouse cursor across your screens to switch between systems.Synergy will cost you (though there is a free trial available): It's a one-off fee of $29 for the standard software, which supports up to three computers. You can also pay a one-off fee of $49 for the Ultimate edition of Synergy, which works across as many as 15 different machines, and gives you other bonus extras such as custom hotkeys.If you prefer, use a keyboard-video-mouse (KVM) switchThere's one more option here, which is to use a traditional keyboard-video-mouse (KVM) switch. It's a device you plug your keyboard and mouse into, and then connect to both your computers. As the name suggests, it lets you share a single monitor between two systems as well, if you need to.Nowadays you'll sometimes see this described as a hub, which is a more modern term for it. These hubs often come built into high-end monitors, so you plug your keyboard and mouse into the monitor, and then the monitor connects to your various computers through its multiple display ports—and you use controls on the monitor to jump between your systems as needed. A 4K KVM switch Credit: Mleeda More advanced KVM switches or hubs have support for multiple monitors, and other accessories and peripherals on top, but the more features you want the more money you're going to have to spend. A basic one for two computers will set you back around $30, while a more advanced one with support for four computers and its own remote is going to be more like $105.A Bluetooth keyboard/mouse comboThe $35 Logitech K480 will work with just about anything that supports Bluetooth, including computers, smartphones, and tablets. With this, switching among devices is as easy as turning a dial on the side of the keyboard.