Where to find your serial number depends on your computer type

Your computer's serial number is a unique identifier printed or etched on your machine. On Windows laptops, it's usually on a sticker on the bottom or back. On desktop computers, check the back panel or inside the case. On Mac laptops, the serial number is printed on the bottom; on Mac desktops, it's on the back or side. If you can't find a physical sticker, you can pull the serial number from your system settings instead — this method works on any computer and takes about two minutes.

The serial number matters when you need warranty service, file an insurance claim, report a stolen device, or prove ownership to a repair shop. It's different from your product key (which unlocks software) and your device name (which you choose yourself). Knowing where yours is saves time if your computer ever needs help.

Key Takeaways

  • Windows laptops usually have a serial number sticker on the bottom or back panel; desktops have it on the back or inside the case.
  • Mac laptops have the serial number printed on the bottom; Mac desktops have it on the back or side of the machine.
  • You can find your serial number in Windows Settings under System > About, or on a Mac in Apple menu > About This Mac.
  • Write down or photograph your serial number and store it somewhere safe — you'll need it for warranty claims, repairs, or theft reports.

Finding the serial number on a Windows laptop

Turn your laptop over and look at the bottom panel. Most Windows laptops have a white or silver sticker with the manufacturer's name, model number, and serial number printed on it. The serial number is usually labeled "S/N" or "Serial Number" and is a mix of letters and numbers. If the sticker is worn or missing, you can find the same number in your system settings.

To find it in Windows Settings, select the Start button, then go to Settings > System > About. Scroll down until you see "Device specifications." The serial number appears in a field labeled "System SKU" or sometimes just "Serial Number" — the exact label depends on your manufacturer. Take a screenshot or write it down.

Finding the serial number on a Windows desktop

Check the back panel of your desktop tower first. Most manufacturers put a sticker there with the serial number, model, and other details. If you don't see one on the back, look inside the case — open the side panel (usually held by two thumbscrews) and check the interior walls or near the motherboard. Some manufacturers print the serial number directly on the case itself rather than using a sticker.

If you can't locate a physical sticker or marking, use Windows Settings the same way you would on a laptop: Start > Settings > System > About, then scroll to "Device specifications" and look for the serial number field. This method works regardless of where the manufacturer placed the physical label.

Finding the serial number on a Mac laptop

Turn your Mac laptop over and look at the bottom case. The serial number is printed directly into the aluminum or plastic — you don't need to peel anything off. It's usually a 12-character code of letters and numbers. If the printing is hard to read, try looking at it under bright light or taking a close-up photo and zooming in on your phone.

You can also find it in your system settings without flipping the computer over. Click the Apple menu in the top left corner, then select "About This Mac." A window opens showing your Mac's information. The serial number appears in a field labeled "Serial Number (system)." Copy it or write it down from there.

Finding the serial number on a Mac desktop

On an iMac, check the back of the screen or the bottom edge of the stand. On a Mac mini, look on the bottom of the unit. On a Mac Studio, check the back panel. The serial number is printed directly into the case — it's a 12-character code of letters and numbers. Lighting matters here; use a flashlight or take a photo to read it clearly if the printing is faint.

The easiest route is still the system menu. Click the Apple menu, select "About This Mac," and find the "Serial Number (system)" field. This takes 30 seconds and works from anywhere in your house, so most people use this method even if they have a physical Mac.

What to do once you have your serial number

Write your serial number down and store it somewhere you can find it later — a notes app on your phone, a document on your computer, or a physical notebook. Take a photo of the sticker (if there is one) as backup. If your computer is ever stolen, lost, or needs warranty service, you'll have this number ready without having to dig through boxes or flip your machine upside down.

Keep this information separate from your computer itself. If your laptop is stolen, the thief has access to the physical sticker but not to your notes or photos stored elsewhere. Some people store it in a password manager or a cloud document — anywhere you can reach it from another device if your computer is unavailable.

Frequently Asked Questions

Is the serial number the same as the product key?

No. The serial number identifies your specific physical machine. The product key (or license key) unlocks software like Windows or Microsoft Office. You need the serial number for hardware warranty claims and repairs; you need the product key to install or reactivate software.

Can I find the serial number if the sticker is missing or damaged?

Yes. Open your system settings (Windows Settings or Mac About menu) and look for the serial number field there. The manufacturer stores this information in your computer's firmware, so it's always available even if the physical sticker is gone or unreadable.

What if the serial number in Settings doesn't match the sticker?

This is rare but can happen if a sticker was replaced during repair. Use the number from your system settings — that's the one your manufacturer has on record. If you're unsure, contact the manufacturer's support line with both numbers and they can tell you which is correct.

Do I need my serial number to sell my computer?

It's helpful to have it available so you can show the buyer the machine is legitimate and not stolen. You should also remove your personal data and reset the computer to factory settings before handing it over, which is a separate process from finding the serial number.