5 Best USB Data Block­ers You Should Use in 2020

Namrata Gogoi

We are quite cautious at protecting the data on our phones and laptops. Be it using a simple VPN service when browsing the internet or changing our master passwords regularly, among many other methods. But what about when you leave your phone to charge at a public space such as your favorite coffee shop or the charging kiosk at an airport? Yes, juice jacking is real and hackers can infect your phone with malicious software through your phone's USB port. Scary, I must say. But thankfully devices like USB data blockers prevent that from happening.

Best USB Data Blockers You Should Use in 2020

The idea behind a USB data blocker is simple. These products block the data pins on the USB port of your charging cable. That way, it eliminates the chance of data flowing from your phone. In short, it acts as a firewall between your phone and the (public) USB port.

The good thing is that most USB data blockers are tiny and fit easily into purse and wallet. You simply have to connect this device your phone's USB Type-A end, and that's about it. Someone rightly called it the USB condom. No, I am not joking.

So, if you have been searching for quality USB data blockers for your phone, here are some of the best ones out there.

1. PortaPow 3rd Gen USB Data Blocker

PortaPow 3rd Gen USB Data Blocker

The PortaPow 3rd Gen USB Data Blocker is perhaps one of the most popular data blockers out there. Like we mentioned above, this tiny device physically blocks data from leaving your devices. And that's not all. It also bundles a built-in chip that automatically detects the type of the device connected whether it's an iPhone or an Android device, and optimizes the current flow accordingly.

The PortaPow 3rd Gen USB Data Blocker can supply power up to 2.4 Amps of power.

Quite obviously, there are quite a few happy users. Out of some twelve hundred reviews, it has raked an impressive rating of 4.7-stars out of 5 on Amazon.

Best USB Data Blockers You Should Use in 2020 Porta pow 2

Quite naturally with such a device, you won't get the same charging speed on your smartphone as you normally do, since the device supports only 2.4A charging.

2. PortaPow Pure USB Data Blocker

PortaPow Pure USB Data Blocker

If you want everything to be 'transparent' and visible, you can check out the PortaPow Pure USB Data Blocker. This one has a transparent casing that allows you to see the no-chip design underneath. Yes, no kidding. It's small and will easily fit into your palm. Like its counterpart above, this Pure variant is also compatible with most smartphones and tablets.

The good news is that the transparent design doesn't make it any less durable. As one user observes, "I accidentally left this in my pants pocket and it went through the washer and the dryer (admittedly, on low heat) and it still works exactly as it's supposed to." Impressive, I must say.

You can also check out PortaPow's cable that comes with a built-in data blocker. It's 3.3ft long and has a standard USB-C port at the end.

3. Plugable USB-MC1

Plugable USB-MC1

The highlight of Plugable's USB-MC1 is its size. It's small and measures just about around 0.8-inches, similar to a flash drive. It supplies current at 1A, which is enough to charge your devices at a decent speed.

Plugable's USB-MC1 has received a fair amount of praise from its users, with 71% giving it a 5-star rating. The common understanding is that it works just as advertised.

Best USB Data Blockers You Should Use in 2020 Plugable2

The only limitation is that the device can draw a maximum power of 1A. So, even if you plug into a port that is capable of delivering power at 2.1A, it will still simulate a 1A current and charge your device at a slow rate.

4. USB Defender Data Blocker

USB Defender Data Blocker

Another mini USB blocker that you give a shot is the one by USB Defender. This device follows the same protocol of blocking the data tracks and thus limiting the flow of malware and other harmful elements from charging stations. It weighs just around 0.16 ounces and you won't even know it's there and is capable of fast charging

At the same time, the device is durable and will last you for a long time. It does its job as claimed.

Best USB Data Blockers You Should Use in 2020 USBDEFENDER2

The customer reception of the product has been good so far and has amassed around 4.7-stars out of 5 on Amazon. A user explains this product simply as, "Feedback was yes, the devices did do what they were advertised to do. Are there better ones out there? Maybe, but this work and you can't beat the price."

5. ET USB Data Blocker for Cell Phone

ET USB Data Blocker for Cell Phone

If you are looking for a functional and inexpensive option, the ET USB Data Blocker makes for a good buy. This one comes in a pack of two and is painted in a shade of white. Plus, it's compatible with phones and tablets.

It supports fast charging. So far, this unit has attracted a fair amount of reviews.

Best USB Data Blockers You Should Use in 2020 ST2

However, the width of the product is a little unwieldy, and may prevent you from using the adjacent USB ports on computers and laptops.

Travel Safe

Though USB data blockers are a great way to prevent theft of data and other information from your phone, the best option is to carry a power bank (see things to check before buy­ing a power bank) with you whenever you travel. That way you won't have to queue for your turn in a charging station. And well, it's safe and the portability is the cherry on top.

Just keep in mind to invest in a fast charger to avoid carrying a brick-like power bank as you meander through airport traffic.

Next up: Fast charging on your phone is incomplete without a compatible wall charger. Click on the link below to discover some of the best wall chargers with fast charging support.


The above article may contain affiliate links which help support Guiding Tech. However, it does not affect our editorial integrity. The content remains unbiased and authentic.

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Namrata loves writing about products and gadgets. She has been working for Guiding Tech since 2017 and has around three years of experience writing features, how-tos, buying guides, and explainers. Previously she worked as an IT Analyst at TCS, but she found her calling elsewhere.