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How to Find Serial Number on Laptop

Learn how to find a laptop serial number from sticker, settings, command tools, BIOS, packaging, common mistakes, troubleshooting, and FAQs.

TechnologyEdited by Pramod Tiwari
2 min read

Quick Answer

To find a laptop serial number, check the bottom sticker, original box, warranty page, BIOS/UEFI screen, or system information settings. On many Windows laptops, you can also use a command prompt tool.

What You Need

  • Laptop
  • Admin access if using system tools
  • Original box or receipt if available
  • Good lighting for stickers

Safety Precautions

  • Share serial numbers only with trusted support or warranty services.
  • Do not post serial numbers publicly.
  • Power off before checking hard-to-reach labels.
  • Avoid removing warranty labels or panels unless instructed.
  • Confirm you are reading the serial number, not model number.

Step-by-Step Instructions

  1. Step 1

    Check bottom label

    Look for S/N, Serial, or Service Tag on the underside.

  2. Step 2

    Check box or receipt

    Original packaging often lists serial number.

  3. Step 3

    Open system settings

    Look in About, System Information, or manufacturer support apps.

  4. Step 4

    Use command tools

    On Windows, command line tools may show BIOS serial information.

  5. Step 5

    Check BIOS or UEFI

    Restart into firmware settings if needed.

  6. Step 6

    Compare labels

    Make sure it is serial number, not product name.

  7. Step 7

    Record securely

    Store it with warranty documents.

Practical Example

Example: Support asks for your laptop serial number, so you check the bottom label and confirm it matches the number in the manufacturer app.

Common Mistakes

  • Reading model number instead
  • Posting serial publicly
  • Using a worn sticker without verification
  • Checking the charger serial
  • Removing panels unnecessarily
  • Typing similar characters wrong

Troubleshooting

Sticker is worn

Check system information, BIOS, original box, or receipt.

Command shows blank

Use manufacturer support app or physical label.

Support says number is invalid

Check for O versus 0 and confirm brand-specific service tag.

Laptop will not boot

Use bottom label, box, receipt, or warranty account.

FAQs

Is serial number the same as model number?

No, the serial number identifies a specific device.

Is it safe to share serial number?

Share it only with trusted support, warranty, or repair services.

Where is serial number on Windows?

It may appear in system information, manufacturer apps, BIOS, or command tools.

What is a service tag?

Some brands use service tag as the device serial identifier.

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