I have an old apple gift card, I want to check its balance

Hi,

Here’s how to check balances for an Apple Gift Card,

https://support.apple.com/en-us/HT202359

Here's how to check balances on an Apple App Store or iTunes Gift Card,

To check your iTunes gift card balance:

1. Call 1-800-MY-APPLE.
2. Check online at www.apple.com/go/gcb/us.
3. Log in to the iTunes Store app on your Apple or PC device. Sign in to our account. Under the “Account” dropdown menu, select the option to view account balance.

I hope this helps.

Gift cards have either the balance marked on the card or $0.

The only way to verify, is to try to redeem it onto your account. link-> Redeem your App Store & iTunes Gift Card - Apple Support