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The 5 best firewalls for Android for free (2021)

Protect the security of your mobile with the best firewalls for Android that you can download for free. Find out what they are and everything they offer you.

Connecting to the Internet from our mobile phone is so common that we tend to not worrying about all the consequences that this connection can entail.

Fortunately, there are tools for Android that help you control the relationship between the applications you have installed on your phone and the Internet.

We are going to dedicate this article to firewalls or firewalls, those apps that you can install on your phone to block all Internet connections that may be harmful for your terminal.

Then we see what is a firewall, the function it has in Android and the best firewalls you can use at present.

What is a firewall and what does it do in Android?

Best firewalls for Android

These are the best firewalls to protect your Android mobile.

A firewall or firewall for Android is an application that acts as an intermediary between the rest of the installed applications and the Internet connection. In theoretical terms, it is a tool that allows or blocks the exchange of communications packets between both parties.

On certain occasions, an application can connect to the Internet with some malicious purpose, and that's where the firewall appears to deny that communication between the two and, in that way, protect the security of your mobile.

Another interesting function of the firewall or firewall for Android is limit the Internet connection of those applications that consume the most. If you think that an app consumes too much data from your mobile rate, with a firewall you can control the exchange of packages in order to save mobile data that you will need at another time.

In short, a firewall or firewall takes care of control the relationship between your mobile phone and the Internet, allowing or denying the exchange of communications to protect the terminal. We are going to know the best firewalls that you can download now on your Android.

Top best firewalls for Android

  • NetGuard
  • Firewall without root
  • Firewall
  • InternetGuard
  • Karma Firewall


One of the best security applications for Android is NetGuard, a free firewall that doesn't need you to root your Android mobile to work. With this app you can block the access of any application to the Internet, as well as from any address, either by mobile data or by WiFi network.

In addition, you can receive notifications when an app tries to connect to the Internet and access a log of all connections when you need it. In this way, NetGuard will help you save your rate data, improve your security and your privacy and also save battery.

Firewall without root

Firewall app without root

Firewall without root allows you to block the internet connection of apps.

The best known firewall for Android is Firewall without root, which you can download for free and which, as its name suggests, no need root.

More than 5 million downloads accumulates in the Play Store this application, with which you can allow or block every connection of your mobile phone to the Internet, as well as receiving a notification each time this happens.

With some minimal permissions to function and a simple interface, Firewall without root is a very useful firewall for your mobile phone if you want to protect it from any danger when connecting to a network.


The Protectstar company is responsible for Firewall, a free app for your mobile with which you can block any unwanted or dangerous access to the Internet. By using this tool, you are the one you choose which apps can connect or not to the network.

Thanks to the Firewall functions, you will be able to see which apps consume the most data, create a custom configuration for the firewall operation and lock apps in the background, among other details. As a noteworthy fact, this application does not need root to work.


Another firewall for Android that no need root is InternetGuard, which you can download for free from a Play Store where it already has more than a million downloads.

With this app you can authorize or block the internet connection of any installed application or web domain, disable the background operation of an app, see all the data usage information and receive a notification every time an element wants to connect to the network, among more functions.

In summary, InternetGuard is a very complete app with which you can protect your mobile and save both battery and mobile data.

Karma Firewall

Karma Firewall App

Karma Firewall is one of the best firewalls for Android.

The latest firewall for Android that we want to recommend you is called Karma Firewall and, like those mentioned above, it is free download and no root required.

Like all good firewalls, Karma Firewall allows you to control Internet access for each of the apps that you have installed on the terminal. You don't need any advanced knowledge To use it, just select the app and block or authorize its connection to the network.