The fastest way to find your serial number

Your laptop's serial number is printed on a sticker underneath the machine or on the back of the screen. Flip your laptop over or open it fully and look for a white or silver label with small text — the serial number is usually a string of letters and numbers, often labeled "S/N" or "Serial Number". This takes 30 seconds and requires no passwords or software.

If the sticker is worn or missing, you can pull the serial number from your operating system in under a minute. The method depends on whether you use Windows or Mac, and both are covered below. You will not need to restart your machine or open any complicated settings.

Key Takeaways

  • The serial number is almost always on a sticker on the bottom or back of your laptop — this is the fastest place to look first.
  • Windows users can find the serial number by opening Command Prompt and typing a single command that pulls it from the system.
  • Mac users can find the serial number in System Information, which opens from the Apple menu in under 10 seconds.
  • You may need your serial number for warranty claims, repairs, or to prove ownership if your laptop is lost or stolen.
  • If you cannot find the serial number anywhere, contact the manufacturer's support line with your laptop model and purchase receipt.

Finding the serial number on the physical laptop

Start by looking at the bottom of your closed laptop. Most manufacturers print a label there with the model number, serial number, and other information. The serial number is usually a mix of letters and numbers, between 8 and 20 characters long. It may be labeled "S/N", "Serial", "Serial Number", or sometimes just printed without a label.

If the bottom is blank or the label is too worn to read, open your laptop fully and look at the back of the screen. Some models print the serial number on the bezel — the plastic frame around the display. You may need to tilt the screen toward a light to read small text. If your laptop has a removable battery, you can also check inside the battery compartment, though this is less common.

Write down the serial number exactly as it appears, including any hyphens or spaces. Take a photo of the label with your phone if you plan to reference it later — this is especially useful if you need to contact support.

Finding the serial number on Windows

Open the Start menu and type "Command Prompt" into the search box. Click on Command Prompt when it appears — you do not need to run it as administrator for this task. A black window will open with a blinking cursor.

Type this command exactly as shown and press Enter:

wmic bios get serialnumber

The serial number will appear on the next line. It will be a single string of characters with no spaces or formatting. Copy this number if you need to save it, or take a screenshot to keep a record.

If the command returns "SerialNumber" with no number below it, your laptop manufacturer may not have stored the serial number in the system — in this case, the physical sticker is your only source. Close Command Prompt by typing "exit" and pressing Enter.

Finding the serial number on Mac

Click the Apple menu in the top-left corner of your screen. Scroll down and click "About This Mac". A window will open showing your Mac's basic information.

Look for "Serial Number" in the list. It will be a string of letters and numbers, usually 11 to 12 characters long. You can click on the serial number to select it, then press Command+C to copy it to your clipboard if you need to paste it elsewhere.

If you do not see the serial number in the main window, click the "System Report" button at the bottom. This opens a more detailed view. The serial number will appear in the Hardware section under "Serial Number (system)" — it is the same number as in the main window, just shown in a different location.

When you need the serial number and what to do with it

Manufacturers use the serial number to look up your warranty status, service history, and what parts are covered under your plan. If you contact support for a repair or replacement, they will ask for this number before they can help you. Having it ready saves time on the call.

If your laptop is lost or stolen, the serial number is the only way to prove you own it if someone else tries to sell it or return it. Police reports and insurance claims both benefit from having the serial number on record. Some manufacturers can remotely disable a stolen laptop if you provide the serial number, though this varies by brand.

Keep a record of your serial number in a safe place — a photo in your phone's cloud storage, a note in your password manager, or a document on your personal computer. This takes one minute and can save hours of frustration later.

What to do if you cannot find the serial number

If the physical sticker is missing and the operating system command returns nothing, contact your laptop manufacturer's support line. Have your laptop model number ready — this is usually printed on the same label as the serial number, or you can find it in your system information. You will also need your original purchase receipt or proof of purchase.

The manufacturer can look up your serial number using the model number and purchase date. This process usually takes a few minutes on the phone. Some manufacturers also allow you to submit a photo of your laptop for verification if you do not have a receipt.

If you are trying to recover a lost or stolen laptop, contact the manufacturer and your local police department with the model number and any other identifying information. Provide them with the serial number once the manufacturer locates it.

Frequently Asked Questions

Is the serial number the same as the model number?

No. The model number identifies what type of laptop you have — for example, "Dell XPS 13" or "MacBook Pro 16-inch". The serial number is unique to your individual machine, like a fingerprint. Both are usually on the same sticker, but they are different.

Can someone use my serial number to steal my laptop?

The serial number alone is not enough to steal a laptop or access your data. It is useful for warranty claims and theft recovery, but it does not unlock the machine or reveal your passwords. You can safely share your serial number with manufacturers and repair shops.

What if the serial number on the sticker does not match the one in my system?

This is rare but can happen if the laptop was refurbished or if the sticker was replaced. Use the serial number from your operating system — that is what the manufacturer's database recognizes. If you are concerned about a mismatch, contact the manufacturer to verify the laptop's history.

Do I need the serial number to sell my laptop?

It is not required, but providing it to the buyer is a good practice. It lets them verify the laptop is not stolen and check the warranty status. If you are selling online, you can mention the serial number in the listing or provide it after the sale is confirmed.

Will resetting my laptop change the serial number?

No. The serial number is stored in the hardware itself, not in the operating system or software. A factory reset, reinstalling Windows or macOS, or any software change will not affect it.