What an EMV chip card is and how it differs from a magnetic stripe
An EMV chip card is a credit or debit card with a small metallic square embedded in the front. That square is a microchip that creates a unique code each time you use it. A traditional magnetic stripe card — the older kind with a black band on the back — stores the same information every time, making it easier for a fraudster to copy your card details if they get hold of the physical card or intercept the data.
When you insert a chip card into a reader at a store, the chip communicates directly with the payment terminal and generates a one-time code for that specific transaction. A fraudster who steals your card number cannot use that code again because it only worked for that one purchase. With a magnetic stripe, the same data travels with every swipe, so a stolen number can be used repeatedly until you notice and report it.
Most U.S. credit and debit cards now have chips. Many also still have a magnetic stripe on the back for older machines that have not been updated, so your card works in both types of readers.
Key Takeaways
- EMV chips create a unique code for each transaction, while magnetic stripes send the same information every time, making stripe cards easier to counterfeit.
- You insert a chip card into the reader rather than swiping it, and you may need to enter a PIN or sign depending on the card and the merchant.
- Chip technology reduces fraud from counterfeit cards created with stolen card numbers, but it does not protect you from online fraud or lost-card theft.
- Most U.S. merchants now have chip readers, though some older machines still accept only magnetic stripes or contactless payments.
- Contactless cards (tap-to-pay) use the same chip technology but do not require you to insert the card into the reader.
How to use a chip card at a store or ATM
At a checkout, insert your chip card into the terminal with the chip facing up and the number facing toward you. Leave it in the reader until the machine tells you to remove it — this usually takes a few seconds longer than a swipe. The terminal will then ask you to enter your PIN or sign a receipt, depending on the transaction amount and the card issuer's rules.
At an ATM, insert the card the same way. The machine will prompt you for your PIN before showing your account balance or allowing a withdrawal. Never remove the card before the ATM returns it to you.
If a reader does not have a chip slot or is broken, you can still swipe the magnetic stripe on the back. The transaction will go through, but it will not have the same fraud protection as a chip transaction. If you are using a contactless card (one that lets you tap instead of insert), hold it near the reader's symbol until you see a confirmation light or hear a beep.
Why chip cards reduce fraud but do not eliminate it
Chip cards were introduced to fight counterfeit fraud — the crime of creating a fake physical card using a stolen card number. Because the chip generates a new code for each transaction, a criminal cannot straightforward copy your card details and make a duplicate card that works. This is why fraud from counterfeit cards dropped significantly after chip readers became standard in the U.S.
However, chip cards do not protect you from other types of fraud. If someone steals your card number online or over the phone, they can still use it to make purchases on the internet, where no chip is required. If you lose your physical card, a thief can use it in person until you call your card issuer and report it missing. If a criminal hacks a merchant's database and steals thousands of card numbers, the chip does not prevent that theft — it only makes those stolen numbers harder to use in stores.
This is why card issuers also offer fraud monitoring and zero-liability policies: if someone uses your card without permission, you report it and the issuer reverses the charge. The chip is one layer of protection, not a complete shield.
The difference between chip, contactless, and magnetic stripe
A magnetic stripe card stores your card number and expiration date on a black band. You swipe it through a reader, and the same data is sent every time. It is fast but vulnerable to counterfeiting.
A chip card has a microchip that creates a unique code for each transaction. You insert it into a reader and wait a few seconds. It is slower than swiping but much harder to counterfeit.
A contactless card (also called tap-to-pay) uses the same chip technology but does not require insertion. You hold it near a reader with a contactless symbol, and the transaction completes in about a second. Contactless cards work at most U.S. merchants now, though some older or rural locations may not have the technology yet.
Many cards have all three: a chip, a magnetic stripe, and contactless capability. Your card issuer decides which features to include, and most modern cards include at least the chip and contactless options.
What to do if a chip reader is broken or not available
If a store's chip reader is broken or offline, the terminal will usually prompt you to swipe your magnetic stripe instead. This transaction will not have chip protection, but it will still go through. Your card issuer's fraud monitoring is still active, so if something looks wrong, you can report it.
If the store has no card reader at all, you can pay with cash, a check, or a digital wallet (like Apple Pay or Google Pay, which use contactless technology). Some small merchants or rural areas may not have updated equipment yet, so it is worth carrying a backup payment method.
If you are at an ATM and the chip reader is broken, try a different ATM or visit your bank branch in person. Do not attempt to use a card reader that looks damaged or unfamiliar, as it could be a skimming device designed to steal your card information.
EMV chip cards and online shopping
When you shop online, the chip in your card does not come into play. You type your card number, expiration date, and CVV (the three-digit code on the back) into a website. The merchant's payment processor handles the transaction, and your card issuer approves or declines it based on your account status and fraud rules.
This is why online fraud is still common even though chip cards are widespread. The chip only protects you in person, at a physical reader. For online purchases, your protection comes from your card issuer's fraud monitoring, the merchant's security practices, and your own habits — like checking for a padlock icon in your browser and never typing your card details into an unsecured website.
If you want extra security for online shopping, many card issuers offer virtual card numbers (also called single-use numbers). You generate a temporary number for each online purchase, and if that number is stolen, it cannot be used again. Check your card issuer's website or app to see if this feature is available.
Frequently Asked Questions
Why does my chip card take longer to process than swiping did?
The chip communicates with the terminal and generates a unique code, which takes a few extra seconds. This is normal and expected. The slight delay is the trade-off for much stronger fraud protection. Some newer terminals are faster than others, so you may notice the time varies by store.
Can I still use the magnetic stripe on my chip card?
Yes. If a reader does not have a chip slot or the chip reader is broken, you can swipe the stripe on the back. The transaction will go through, but without the chip's fraud protection. Most merchants now have chip readers, so this is becoming less common.
Do I need a PIN for every chip card purchase?
No. Some transactions require a PIN, others require a signature, and some require neither. The card issuer and the merchant's system determine this based on the transaction amount and type. Debit cards usually require a PIN, while credit cards often do not.
Is a contactless card less find than a chip card?
No. Contactless cards use the same chip technology and create a unique code for each transaction, just like inserted chip cards. The only difference is that you tap instead of insert. Both are much more find than magnetic stripes.
What should I do if my chip card is lost or stolen?
Call your card issuer when ready using the number on your statement or their website. Report the card missing and ask them to cancel it and send a replacement. Most issuers offer zero-liability protection, so you will not be charged for fraudulent purchases made after you report the loss.