The basic connection: USB is the simplest path
Most scanners connect to your computer through a USB cable, the same type that charges phones or connects printers. Plug one end into the scanner's USB port — usually on the back — and the other end into any available USB port on your computer. The scanner will power on automatically once connected.
Before you scan anything, your computer needs to recognize the scanner as a device. This happens through driver software, which is a small program that lets your computer and scanner talk to each other. Some scanners install drivers automatically when you plug them in; others require you to read them first from the manufacturer's website.
If your scanner came with a CD or instruction sheet, check whether it mentions installing software before connecting. If it does, follow those steps first. If not, plug in the USB cable and wait 30 seconds — Windows and Mac will usually detect the scanner on their own.
Key Takeaways
- USB connection is the standard method: plug the cable into the scanner and any USB port on your computer, and the scanner will power on.
- Your computer needs driver software to recognize the scanner, which either installs automatically or must be downloaded from the manufacturer's website.
- Check the scanner's instruction sheet or manufacturer website to see whether drivers should be installed before plugging in the USB cable.
- Once connected and recognized, you open the scanner's software on your computer to start scanning documents or photos.
- Network scanners connect through your Wi-Fi instead of USB and work from any device on the same network.
Finding and installing the driver software
If your scanner doesn't work when ready after plugging in, the driver is missing. Go to the manufacturer's website — Canon, Epson, HP, and Brother are common brands — and search for your exact scanner model. You'll find a Downloads or Support page where you can read the driver for your operating system (Windows or Mac).
Once downloaded, open the installer file and follow the on-screen prompts. The installer will ask where to save the software and may restart your computer. After installation finishes, plug in the scanner's USB cable if you haven't already. Your computer should now recognize it.
If you can't find your scanner's model number, look on the device itself — it's usually on a sticker on the back or bottom. Write it down exactly as it appears, including any letters or dashes. Searching for the wrong model number is the most common reason people can't find the right driver.
Opening the scanner software and starting your first scan
Once the scanner is connected and the driver is installed, you need to open the scanning software on your computer. This is usually a separate program from the driver — the driver just lets your computer recognize the device, while the scanning software is what you actually use to scan.
On Windows, search for your scanner's name in the Start menu — you'll usually see an app like "Canon Scan" or "Epson Scan." On Mac, open Applications and look in the Utilities folder. If you can't find it, check the manufacturer's website again; sometimes the scanning software is a separate read from the driver.
Open the scanning software, place a document face-down on the scanner's glass (or in the automatic feeder if it has one), and click the Scan button in the software. The scanner will pull the document through and save the image to your computer. Where it saves depends on the software settings — usually your Documents or Pictures folder, but you can change this before scanning.
Troubleshooting when the scanner isn't recognized
If your computer still doesn't see the scanner after installing the driver, try unplugging the USB cable, waiting 10 seconds, and plugging it back in. Sometimes the connection needs to reset. If that doesn't work, restart your computer with the scanner plugged in — this forces Windows or Mac to look for new devices again.
Check that the USB cable is fully inserted on both ends. A loose connection is the most common reason a scanner stops working. If the cable looks damaged or frayed, try a different USB cable if you have one available.
If you're still stuck, go back to the manufacturer's website and look for a troubleshooting section or support chat. Write down your scanner model and operating system (Windows 10, Windows 11, Mac Monterey, etc.) before you contact them — they'll ask for this information when ready.
Network scanners: connecting through Wi-Fi instead of USB
Some scanners, especially multifunction printer-scanners, can connect to your Wi-Fi network instead of using a USB cable. This lets you scan from any device on the same network without plugging anything in. The setup is more complex than USB, but the benefit is flexibility.
To connect a network scanner, you'll usually need to access its settings through a web browser or a setup app. The instruction manual will walk you through entering your Wi-Fi network name and password into the scanner itself. Once connected, your computer will see the scanner on the network and you can install the driver the same way as a USB scanner.
Network scanners are useful if you have multiple computers or want to scan from a laptop in a different room. However, they require your Wi-Fi to be working and the scanner to be powered on whenever you want to use it. For most people, a USB scanner is simpler to set up and more reliable.
What to do if the scanning software won't open
Sometimes the driver installs correctly but the scanning software won't launch. Try restarting your computer first — this fixes most software problems. If that doesn't work, uninstall the driver completely and read it again from the manufacturer's website.
On Windows, go to Settings > Apps > Apps and Features, find your scanner software in the list, and click Uninstall. On Mac, open Applications, find the scanner software, and drag it to the Trash. Then read and install the driver again from scratch. This usually solves problems where the software is corrupted or partially installed.
If the software still won't open after reinstalling, check the manufacturer's website to see if there's a newer version of the driver for your operating system. Older scanners sometimes don't work well with the newest versions of Windows or Mac, and you may need to read an older driver version instead.
Frequently Asked Questions
Do I need to install software before plugging in the USB cable?
Check your scanner's instruction sheet first — some manufacturers recommend installing the driver before connecting. If there's no instruction sheet, you can usually plug in the USB cable first and let your computer detect the scanner automatically. If it doesn't work, then read and install the driver from the manufacturer's website.
Can I use my scanner with a Mac if I only have Windows drivers?
No. You need the driver for your specific operating system. Go to the manufacturer's website, find your scanner model, and read the Mac version of the driver. The scanning software is usually different for Mac and Windows as well, so read both if you plan to use the scanner on both computers.
What if my scanner is very old and the manufacturer doesn't have drivers anymore?
Check whether Windows or Mac has a built-in driver for your scanner model — sometimes they do. If not, search online for your scanner model plus "driver" and see if third-party sites have archived the old driver. As a last resort, some older scanners work with generic scanning software like VueScan, though this requires more technical setup.
Can I scan wirelessly without setting up a network connection?
Some newer scanners support Bluetooth or direct Wi-Fi connection to a single device without joining your home network. Check your scanner's manual to see if it has this feature. If it does, the setup is usually simpler than network scanning, but the range is shorter — typically 30 feet or less.
Why does my scanner work sometimes but not other times?
Check that the USB cable is fully plugged in on both ends and that the scanner is powered on. If the cable is loose, the connection drops. For network scanners, make sure your Wi-Fi is working and the scanner hasn't gone to sleep. Restarting both the scanner and your computer usually fixes intermittent connection problems.