Patricia Lex, Member
@patricialex
The easiest way you can activate your Capital One credit card is online, through either their website or their mobile app. Alternately, you can activate your credit card by calling customer service at (800) 227-4825.
Here’s how to get Capital One to activate your card online:
Website: If you prefer to activate your credit card online, just go to Capital One’s activation page and log in (create an account, if necessary). Then, enter the 3-digit security code on the back of the card when prompted.
Mobile app: To activate your card through the mobile app, sign in with the same information as your online account. Tap your profile, then “Account Settings,” then “Activate Credit Card.” Enter the 3-digit security code when prompted to activate the card. The card will be available to use for purchases immediately after.

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Compare CardsBob Bruemer, Member
@robert_bruemer
Calling to activate a Capital One card is probably the better option if you’re in a hurry because activating your card online requires creating an account first. But both aren’t too hard to do and don’t take all that much time. You can also find the instructions in the letter where you got your Capital One credit card or on the sticker attached to your credit card when you first get it.
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