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A USB data blocker is a small adapter that sits between a USB power source and your device. It is designed to allow charging while blocking data transfer over that USB connection—useful when you are considering an unfamiliar public charging port.
What a USB data blocker does
USB can carry power and data through the same connection. USB Power Delivery likewise supports power and data over one connection, according to the USB Implementers Forum. A data blocker, also called a charge-only USB adapter, is intended to interrupt the data path while leaving power available for charging. Some educational guidance also uses the informal nickname “USB condom.”
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The blocker works at the connection: it is intended to prevent data exchange through the USB link between the charging source and your device. It is not a general-purpose security device and should not be treated as protection against every form of device compromise, unsafe electrical condition, wireless threat, or faulty accessory.
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When you might use one
A data blocker is relevant when you want to charge from a USB port you do not control, such as a public charging terminal. The University of Colorado Anschutz Information Security recommends using a data blocker or charge-only adapter between a device and a public terminal to prevent data transfer over that connection: Protect Your Device When Traveling.
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Data Blocker, USB C Data Blocker Protect Against Juice Jacking, 6-pcs
- 【Combination set】: More affordable, The data blocker combination kit shown in the main image, which can meet your daily use needs, suitable for any mobile phones and electronic devices with USB A and USB C interfaces.
- 【PROTECT YOUR PHONE / TABLET】 : Think about that Traveling or going out in public areas one time when you needed a charge at an airport but were too scared to get juice jacked. That is why we brought this data blocker for you. Charge your device with this powerful USB data blocker without worrying about any hacker getting in your device.
- 【HIGH SPEED CHARGING】: USB defenders are made for blocking the hacker as well as fast charging, The 4th generation design chip can be used for the universal charging standards automatically switch to, Compatible with Various brands of smartphones, ensure compatibility with your device. and charge at up to 2.4 Amps.
- 【to make high quality safety products】:Advance manufacturing process design The metal shell material has multiple safety protection functions such as heat dissipation and fire safety, USB Data Blocker are used by the governments of the USA, Canada, UK and New Zealand as well as 100s of corporations around the world to secure their devices，100% guarantee against hacker attack.
- 【Perfect Compatibility】: We USB-C to USB-C and USB-A to USB-C data blocker ensures seamless data security across all your Type-C tech gadgets including iPhone 15 and 16 series, Galaxy S25 S24 S23 S22 S21 S10, USB-C iPad, Android Tablets, MacBooks, and more
Alternatives to an inline blocker
| Option | How it avoids a direct public USB connection | What to check |
|---|---|---|
| AC outlet, your own USB power adapter and cable | Power comes from the outlet through your own adapter rather than a public USB port; this is an alternative recommended by the University of Colorado Anschutz guidance. | Bring a compatible adapter and cable. |
| Charge-only USB cable | The cable is designed to allow charging while blocking data. Plugable describes this function for its USB-C cables in vendor guidance updated August 21, 2025: How secure are charge-only USB-C cables against juice jacking? | Confirm the connector and charging capabilities suit your device; the vendor description is not an independent product test. |
| Power bank charged from a trusted source | Charge from the battery pack instead of connecting directly to a public USB charging point. The University of Colorado recommends a battery pack as a travel option: Stay Cybersecure While Traveling: Avoid Public USB Charging Risks. | Keep the power bank charged and use a cable compatible with your device. |
| Inline USB data blocker | Placed between the USB source and device, it is designed to allow power while blocking data transfer. | Check connector type and stated charging support for both the source and device. |
What to check before choosing one
- Connector fit: Match the accessory to the ports on your device and the power source.
- Charging support: Do not assume every blocker or charge-only cable supports every device or charging mode. USB Power Delivery can carry power and data together, and the cited vendor describes charge-only USB-C cables; those facts do not establish universal compatibility.
- Your charging situation: If you can use an AC outlet with your own USB power adapter, or a power bank charged from a trusted source, you can avoid connecting directly to a public USB port.
The purpose of a USB data blocker is specific: reduce the risk of data exchange through a USB connection while charging. The cited sources do not provide controlled comparisons, charging-speed measurements, or product-effectiveness tests, so choose based on the connection and charging capabilities you need rather than assuming a particular model offers a broader security guarantee.
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Bestseller No. 5
Best Value
PortaPow USB Data Blocker (2 Pack) - Protect Against Juice Jacking
- Attach between your USB cable and charger to physically block data transfer / syncing; Charge mobile devices without any pop-ups or risk of hacking / uploading viruses in cars, airports etc
- This is our USB-A to A version, USB-C and others available; Read below if its the right one for your device
- The only data blocker to physically show you that its blocking data and several other great features; See full details below
- Allows charging without any risk of hacking / uploading viruses, can charge from an office PC even if USB socket has been disabled without breaking IT policy
Rank #4
Afterplug USB-C to USB-C Data Blocker, Charge-Only, 240W Charging (2-Pack)
- Special Attention: For optimal charging speeds, ensure the entire connection is USB-C to USB-C from end to end. Using this Data Blocker with a USB-A to USB-C cable may result in slow charging or no charging due to the absence of data pins.
- No Loopholes Data Security: Hackers are everywhere—don't let your USB-C devices fall prey! Our blocker ensures comprehensive protection against malware, viruses, and hacking threats, guaranteeing data integrity and privacy, thanks to its no data pins feature
- Juice Jacking Shield: Our robust solution stands guard against data theft, ensuring your personal information remains secure from unauthorized access
- Perfect USB C-to-C Compatibility: Our USB C male to USB C female data blocker ensures seamless data security across all your Type-C tech gadgets including iPhone 15, 16 & 17 series, Galaxy S25 S24 S23 S22 S21, Fold & Flip Series, USB-C iPad, Android Tablets, MacBooks, and more
- Safe and Uncompromised Fast Charging: Experience worry-free charging of up to 240W PD, whether you're at hotels, airports, university libraries, or outdoor charging stations. With fast charging capabilities, your devices remain safeguarded wherever you go.
Rank #3
Sale
4 Kinds of USB Data Blocker Adapter, USB C Data Blocker for iPhone 15 16 17 and for Android Phone or for ipad, A to A & A to C & C to C & C to A Only for Charge, Protect Against Juice Jacking (Black)
- ✨ Absolutely Safe: Features an internal physical data line cut design, permanently disconnecting the data pins in the USB interface, leaving only the power pathway, effectively eliminating the risk of data leakage.
- ⚡ Fast Charging Without Slowdown:The usb data blocker Adapter supports charging up to 100W and is compatible with multiple fast charging protocols. Charging speed is the same as the original charger, ensuring both safety and efficiency.
- 🔗 Wide Compatibility: Suitable for all devices that use various charging interfaces. Whether it’s iPhone, Android phones, iPad, tablets, Bluetooth headsets, or power banks, just plug and play.
- 👌 Compact and Portable: The lightest model weighs only 2.2g, as compact as a USB drive. Protects safe charging anytime, anywhere.
- 🎯 Plug and Play: No drivers, no apps, no complicated setup required. Simply insert into a public USB port and connect your charging cable to start safe charging.
Rank #2
JSAUX USB Data Blocker, Data Blocker Charge-Only, 4-Pack, Grey
- The Ultimate Data Guardian: Worried about the risk of mobile phone data leakage or viruses when using public charging stations? A data blocker is an effective way to reduce these risks. By physically blocking data transfer, it helps protect your device from potential spyware or hacking attempts while charging
- Only for Charging: With our USB data blocker, you can charge your device without any risk of data transfer. It allows only the charging function while blocking data transfer and syncing. Your phone will not receive pop ups requesting data transmission
- Fast Charging for USB C Data Blocker: JSAUX USB C Data Blocker adopts PD 3.0/2.0 fast charging technology, supports 100W fast charging (20V/5A), and is also compatible with charging power of 240W/140W/60W/45W/36W/27W/15W, etc. The USB Data Blocker supports up to 2.4A charging. (NOTE: The actual charging speed depends on your device and wall charger.)
- Compact Design for Travel and Daily Use: Small and lightweight for easy carrying in pockets, backpacks, or keychains. Ideal for travelers, commuters, and anyone who frequently uses public charging stations. The transparent casing provides a modern and durable look
- USB & USB C Data Blockers 4 Pack: We offer you two USB Data Blockers and two USB C Data Blockers, compatible with iPhone 18 Pro/18 Pro Max, iPhone Duo, iPhone 17/17e/Air/17 Pro/17 Pro Max, iPhone 16/16 Plus/16 Pro/16 Pro Max, iPhone 15/15 Plus/15 Pro/15 Pro Max, Samsung, iPad, Macbook and other devices. Works with both USB and USB C ports, ideal for safe charging at airports, hotels, and public charging stations
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