Where to find your laptop's serial number

Your laptop's serial number is a unique identifier printed or engraved on the device itself, usually on the bottom panel or inside the battery compartment. The exact location depends on your manufacturer — Dell, HP, Lenovo, Apple, and others place them differently. Start by shutting down your laptop completely and flipping it over to check the bottom case for a sticker or engraving. Look for a label that says "Serial Number," "S/N," or "SN" followed by a string of letters and numbers.

If you don't find it on the bottom, check inside the battery compartment if your laptop has a removable battery. Some older models and certain business laptops keep the serial number there. For Apple MacBooks, the serial number is usually on the bottom case near the regulatory information, or you can find it by clicking the Apple menu, selecting "About This Mac," and looking under "Serial Number" in the System Report. The serial number is typically 8 to 20 characters long and may include both letters and numbers.

If your laptop is too damaged to read the sticker or you've lost the physical label, you can retrieve the serial number through your operating system without opening the device. This method works even if the sticker has worn away or become illegible.

Key Takeaways

  • Your laptop's serial number is usually on a sticker on the bottom case or inside the battery compartment, labeled as "S/N" or "Serial Number."
  • On Windows, you can find the serial number by opening Command Prompt and typing a specific command that pulls the information from your system.
  • Mac users can find the serial number when ready by going to Apple menu > About This Mac > System Report.
  • You will need your serial number to register your device with the manufacturer, file warranty claims, or report a stolen laptop to police.
  • Write down or photograph your serial number and store it somewhere safe separate from your laptop in case you need it later.

Finding the serial number on Windows

Open the Command Prompt on your Windows laptop by pressing the Windows key, typing "cmd," and selecting "Command Prompt" from the results. Once the black command window opens, type the following exactly as shown: wmic bios get serialnumber and press Enter. Your serial number will appear on the next line.

If that command doesn't work, try an alternative method: type systeminfo and press Enter. Scroll through the information that appears until you find "System Serial Number." This method shows you additional system details along with the serial number, so it takes slightly longer to read but works on all Windows versions.

You can also find the serial number through Settings on Windows 10 and 11. Go to Settings > System > About and scroll down to find "Device name" and other system information. Some manufacturers also display the serial number here, though not all do. If you're still having trouble, check your laptop's original documentation or the box it came in — the serial number is often printed on the outside of the packaging.

Finding the serial number on Mac

Click the Apple menu in the top-left corner of your screen and select "About This Mac." A window will open showing your Mac's basic information. Look for "Serial Number" in the list — it appears near the top, usually after the model name and processor information. You can click the serial number to copy it to your clipboard, then paste it into a document or email if you need to share it.

If you need more detailed information about your Mac, click "System Report" in the About This Mac window. This opens a more comprehensive view of your hardware and software. The serial number is listed under the Hardware section. This same information is also available by holding Option and clicking the Apple menu, then selecting "System Information."

Why you need your serial number

Your serial number is essential for several practical reasons. If your laptop is stolen, you can provide the serial number to police and your manufacturer, which helps identify the device if it's recovered or sold. Manufacturers use serial numbers to track which devices are under warranty, so you'll need it to file a warranty claim for repairs or replacement. Some manufacturers also use the serial number to verify that you own the device before providing technical support or sending replacement parts.

When you register your laptop with the manufacturer — through their website or during setup — they record your serial number along with your contact information. This registration can speed up warranty claims and help the manufacturer contact you if there's a safety recall affecting your specific model. If you ever sell your laptop, the new owner may need the serial number to transfer the warranty or register the device in their name.

Storing your serial number safely

Write down your serial number and store it somewhere separate from your laptop — a notebook at home, a document in cloud storage, or a photo on your phone. If your laptop is stolen or lost, you won't be able to access the information stored on it, so keeping a copy elsewhere is important. Many people photograph the bottom of their laptop and save the image to their phone or email it to themselves for safekeeping.

If you register your laptop with the manufacturer, they keep a record of the serial number tied to your account. You can usually retrieve it by logging into your manufacturer's website and checking your registered devices. This is helpful if you lose your personal copy, though it's still wise to keep your own backup in case you forget your account password or the manufacturer's website is unavailable.

What to do if you can't find the serial number

If the sticker on the bottom of your laptop is missing or unreadable and the operating system commands don't show the serial number, check your original purchase receipt or invoice. The serial number is often printed on the receipt along with the model number and purchase date. If you bought the laptop from a retailer, you can contact them with your receipt information and they may be able to look up the serial number in their system.

Contact the manufacturer's customer support with your laptop's model number, which is usually easier to find than the serial number. Provide them with proof of purchase if possible. They can often retrieve your serial number from their records or help you identify it another way. If your laptop is under warranty, the manufacturer has your information on file and can look it up using your contact details or the original order number.

Serial number versus model number

Your laptop has both a serial number and a model number, and they serve different purposes. The model number identifies the type and version of your laptop — for example, "Dell XPS 13" or "HP Pavilion 15." Many identical laptops share the same model number. The serial number is unique to your individual device, like a fingerprint. No two laptops have the same serial number, even if they're the same model made on the same day.

When you're looking for information about your laptop's specifications, features, or available drivers, you'll use the model number. When you need to prove ownership, file a warranty claim, or report theft, you'll use the serial number. Both are usually printed on the same sticker on the bottom of your laptop, so you can find them together.

Frequently Asked Questions

Can someone use my serial number to claim my warranty?

Manufacturers require proof of purchase along with the serial number to process a warranty claim. Your serial number alone is not enough — they need a receipt, invoice, or proof that you registered the device in your name. However, it's still wise to keep your serial number private and share it only with the manufacturer or authorized service centers when necessary.

What if my laptop has two serial numbers?

Some laptops have multiple identification numbers — one for the device itself and one for the motherboard or other components. The main serial number for warranty and ownership purposes is the one on the bottom case or battery compartment. If you're unsure which one to use, contact the manufacturer with both numbers and they'll tell you which one they need.

Does the serial number change if I replace the hard drive or battery?

No. The serial number is tied to the chassis and motherboard of your laptop, not to replaceable components like the hard drive or battery. Even if you replace every internal part, the serial number stays the same and the device is still considered the same laptop for warranty and ownership purposes.

Can I look up someone else's laptop using the serial number?

No. Manufacturers do not share ownership information based on serial number alone. If a laptop is stolen, law enforcement can contact the manufacturer with a serial number and a police report, but private individuals cannot look up who owns a device. This protects your privacy.

Is the serial number the same as the product key or license key?

No. The serial number identifies your physical laptop hardware. The product key or license key is a separate code that activates your operating system or software. You'll find the product key in your Windows or software documentation, not on the laptop itself. They serve completely different purposes.