Hayley answered on 4.3.16:
1. Click on the “Check a GiftCard Balance” Link.
First, go to Gap.com, then click on “Gift Card” at the top of the homepage. Next, you’ll be taken to the Gift Services page, where the gift card balance link is located.
2. Enter the 16-digit Number, Followed by the 4-digit PIN.
When the pop-up box appears, enter your gift card number and PIN into the empty fields. You can find this information on the lower back of your Gap gift card.
View Your Remaining Balance
Once your number and PIN are validated, you’ll be able to view the remaining balance, which can be used toward any purchase online or in-store.
You can also view your Gap gift card balance when you sign into your Gap account or when you go to the Payments & Promotions area at checkout.
Gap gift cards never expire, so enjoy using the rest of your available amount!