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Welcome to the Security Center

Your security is our priority.

Learn how Citi protects your accounts – and how you can protect yourself against identity theft and other security risks.

We help protect your accounts from the time you apply

From account opening to banking online and shopping, our features and services help keep you protected.

Citi® Identity Theft Solutions

In the unlikely event you're a victim of identity theft, Citi will work with you every step of the way to help resolve the problem. Learn more.

$0 Liability on Unauthorized Transactions for Consumer Cards

You're protected if you have unauthorized purchases on your account. If you see and promptly report a transaction you didn't authorize on your Citibank® consumer debit card or consumer credit cards, you can be assured that you won't be liable for it.

Fraud Detection & Early Warning

As a Citi cardmember, you can be assured that we are constantly trying to improve ways to help safeguard and protect you and your account. Through monitoring of our customers' accounts, we can detect fraud or unauthorized use, often before you are even aware of it. If we notice suspicious activity on your card, we may contact you by phone, text, email* or mail to confirm you have authorized that purchase.

*Note that we will never ask you to provide confidential information through text or email.

Online & Mobile Security

Citi is committed to ensuring the safety of your account information and maintaining the reliability of your account access. From time to time, financial institution websites can be affected by excessive website traffic from malicious sources, which can prevent customers from accessing their accounts online. We are aware of such threats against US. banks and want to reassure you that Citi uses advanced technology to help protect you from fraud and continuously monitors our websites to ensure they remain available to our customers. Learn more about how we protect you when you bank with us online or using the Citi Mobile® App.

A few easy steps can help keep you safe

Learn how to safeguard your computer, avoid e-mail and mobile fraud, and much more.

Protect Yourself from Fraud

A great way to protect yourself from fraud is by becoming educated about the different types of fraud that exist today. Learn how to spot and stop fraud, and steps you can take to prevent fraud on your accounts. Learn more.

Protect Your Family's Information

Educating your family about security best practices for their digital interactions is an important step in protecting their information. From cyber bullying to social networking, learn more about how to keep your family safe.

To learn more about how to help seniors avoid scammers and viruses, click here.

Protect Your Information on Your Computer and Mobile Devices

It's easy to depend on mobile devices for managing your finances. Yet security threats often evolve just as quickly as technology advances and phones and tablets are not immune. Learn about security software and the things you should do to guard your information while at home and away. Learn more.

Security Tools

Citi Quick Lock

Misplaced your Citi debit or credit card? You can lock it in the Citi Mobile® App or Citi Online. Citi Quick Lock protects your card without you having to change your account number or go through the steps of ordering a new card. It buys you peace–of–mind and time to find your card. And when you find it, you can unlock it just as easily.

Credit Cards

Instantly block new purchases and cash advances–while allowing recurring transactions such as payments, balance transfers and credits to continue without disruption.

Debit Cards

Instantly block new purchases, withdrawals and select transfers – while allowing recurring transactions, bill payments, deposits, credits and online transfers to continue without disruption.

Customize Your Alerts

Stay on top of your account activity with customized Citi Alerts. You can get notifications for transaction details, including if the transaction is made outside of the US, if the card is not present for the purchase, or even if it exceeds the amount set by you.

Go Paperless

Sign up for Paperless to receive statements and other documents digitally only. Going paperless reduces the threat of mail fraud or identity theft. It is also convenient, and best of all, there is no fee to enroll. Enroll in Paperless here.

Virtual Account Numbers for Citi Consumer Credit Cards

Generate a temporary credit card number that makes it virtually impossible for anyone to steal the real one while you're shopping online. By using Virtual Account Numbers, you get peace of mind knowing that your actual credit card number is never revealed to merchants. Plus, each number can only be used with a single merchant, so it will be void if someone tries to use it elsewhere. Any Citi® cardmember with an eligible card who has registered his or her account online at can use Virtual Account Numbers. Virtual Account Numbers are not available for all cards. To access your Virtual Account Number, sign in to your cards account.

Contact Us

Citi Customers: report a lost or stolen card, or seek help for identity theft

Utilize Citi Quick Lock, then call customer service:

Debit Cards:

NY metro area: 1 800 6 2 7 3 9 9 9

Other areas: 1 800 2 7 4 6 6 6 0

Credit Cards:

1 800 9 5 0 5 1 1 4

Report suspicious emails or phishing

1 8 8 8 2 8 5 9 6 9 6

To view samples of fraudulent emails that have previously been reported to Citi, click here.

Report a Vulnerability

The safety and security of your account is of the utmost importance to us. If you believe you've discovered a security issue in one of our products or services, please notify us. Please note that we are not encouraging you to hack, or otherwise attempt to gain access to Citi systems in violation of applicable law. Report a Vulnerability