15 Best Free Firewall Software in 2021

Despite the built-in firewall of Windows ( Windows defender), many of us ( included me) we would prefer to have an additional third party firewall. That’s where this list of the best free firewalls comes to the rescue.

The firewalls listed here have been topping all the charts on the internet and offline for a number of reasons. Most only offer extreme protection, others are lightweight and offer an easy-to-use interface.

Although keep in mind that some of the firewalls listed here may be freemium. That is, you can buy its premium versions for additional functions.

15 Best Free Firewall for Windows

Here are the 15 best free firewalls that you can use on your Windows 10, 8, or 7 PC.

  1. Comodo Firewall
  2. Advanced
  3. Glass wire
  4. Small wall
  5. Private firewall
  6. AVS Firewall
  7. Free Avast Antivirus.
  8. Zone alarm
  9. Evorim
  10. PeerBlock.
  11. Net defender
  12. Sofos XG
  13. OpenDNS
  14. Ashampoo
  15. R- Firewall

1. Comodo Firewall

My personal favorite feature it offers Comfortable it’s your “Sandbox” mode. You can put a sandbox on any program, which will run the program in an isolated mode so that any attack, breach of that program does not leak into the rest of your operating system.

Apart from that, you can easily allow / block certain applications access to the internet. The ease of adding programs to this list is also commendable.

It tells you how reliable a program is from its “Rating Scan” feature. However, the only problem is that if you are a victim of exploit attacks, Comodo becomes useless.

It features a browser cleanup feature as well as a game mode for better performance of both.


  • Sandbox mode.
  • Kill-switch
  • Easy blocking / unblocking of internet access.
  • Qualification scan
  • Automated alerts.


  • Helpless against exploit attacks.
  • Auto installs search engine unless disabled during installation.

2. OutPost

OutPost’s best feature is its built-in file and folder blocker! Or you can fall in love with its multi-layered security protocols. You can actually customize each of the four security layers manually.

It also offers a built-in anti-leak module to prevent unwanted traffic from escaping. It also has a connection monitor that helps identify unwanted outgoing connections.

YOU CAN ALSO READ:   Fixed: Scanner needs WIA driver: Canon, HP, Fujitsu, Epson

Its program activity tracker will allow you to see which application modifies what on your system. The interface is extremely easy to use.


  • Easy to use.
  • Light
  • File and folder cabinet.
  • Four layers of security.


  • The number of pop-ups is overwhelming.

3. GlassWire

An advanced, graphics-rich interface is what drew me to Glasswire first. ( Yes, I like shiny things!) Shows a list of programs and the exact hosts to which they are connected. If something looks suspicious, feel free to close it.

It also stores “alert” information so you can always go back and verify what made Glasswire suspicious. Then there is a network monitor that monitors your WiFi and the connection from other computers.

This free firewall allows multiple profiles for different situations. You can also monitor as well as adjust bandwidth usage / allocation for various applications.


  • Graphical UI
  • Network monitor
  • Advanced lock mode.


  • It is not completely free.

4. Tiny Wall

An essential tool especially for those who spend their days mainly on the Internet (¿ who does not?). Also for those who don’t like to skip dozens of windows before setting up their firewall. And hey, if you’re low on space, it consumes less than 1Mb of disk space!

However, it is not extremely feature-rich. Displays instant, real-time alerts in a small, minimized window so whatever you’re doing is not interrupted. It allows you to whitelist sites and applications that you consider safe. And it offers basic WiFi protection.

That is all!


  • Quick and easy to configure.
  • Extremely light.
  • Basic protection.


  • It is super low on features.

5. Private firewall

A forgotten but not fallen hero is what Private Firewall is. The parent company does not work, update or probably does not even remember that they gave birth to this baby once. Ironically, it is still one of the best free firewall software.

Allows whitelisting / blocking apps and websites. Clipboard monitoring, screen content monitoring, email monitoring are some of the additional features it offers. Suspicious websites are automatically blocked.

YOU CAN ALSO READ:   How to Sign Out of Netflix on Amazon Fire Stick

Emails are also monitored. Offers advanced level host scanning and monitoring.


  • Extremely feature rich.
  • Easy to use
  • Port tracking available.


  • Lots of “text” in the interface.
  • It is not available for Windows 10.

6. AVS Firewall

If you have kids, you would love AVS. Mainly because of its parental control features that most of the other options on this list lack. You define the list of websites your children visit and prevent them from maturing “too” quickly.

You can choose which websites and IP addresses can connect to your system, and which cannot. Your registration is also protected, alterations are also controlled. It also works as an ad blocker. Set security levels and control which applications do or do not connect to the Internet.


  • Parental control.
  • Record tracking.
  • Security levels.


  • The installation process is not impressive.

7. Avast Free Antivirus

Avast is one of the most professional and established names in the industry. It offers a free version of its antivirus and firewall that you can use.

Some of the features include a sandbox mode for new and suspicious apps, WiFi protection. It also has a Do Not Disturb mode which was previously “Game Mode”.

It also monitors the behavior of the application and submits suspicious files to avast for detailed analysis. It also has an intelligent scan function.


  • Sandbox mode.
  • WiFi protection
  • DND mode.
  • Multi-layer security.


  • There are no major cons.

8. Zone alarm

Possibly the best feature-rich free firewall in 2020 on this list. For starters, your free online cloud backup ( up to 5 Gb) is awesome. Prevents accidental data loss, corruption or deletion!

Then it offers a layer of wireless and public network protection. It is not only a firewall, but it is also an antivirus. It has two modes, “Machine learning” and “Maximum security”. Basically they are like an automatic and easier configuration ( self-learning) or a more manual configuration and control ( maximum security).

Stealth Mode acts as an additional curtain for hackers and intruders. For US customers, it also has “recovery assistance” in the event of default.

YOU CAN ALSO READ:   How to Convert EPUB to MOBI (Online & Free)

Obviously, other common features are also available, such as application control, network monitoring, etc.


  • Online backup.
  • Multi-layer security.
  • Advanced features.


  • False flags are common.

9. Evorim

Its “monitoring mode” is my personal favorite. Once enabled, all applications need user consent before they can access the Internet. It also prevents browsers, websites, and software from collecting or sharing telemetry.

Evorim also shows you a list of all the programs currently running on the system and allows users to set permissions for each of them individually.

The firewall also monitors the background activities of the applications and notifies if there is any transmission or suspicious activity. It can also be used simultaneously with an antivirus that is already running on the system. Access rules can be set for both alphabetic website addresses and IP addresses.


  • Monitoring mode
  • Zones ( to grant identical permissions to multiple apps).
  • Block botnets, viruses, and background data.


  • There are no major cons.

10. Peer Block

More than a firewall, it is a “blocking tool”, as its name suggests. Allows you to upload a list of IP addresses to ban. These can be for sites, ads, from certain countries, or anything else you want to block.

The interface is extremely basic, it just loads the IP to ban list and it takes care of the rest. This helps users protect themselves from unwanted inbound and outbound traffic.


  • Extremely lightweight.
  • Easy to use.


  • It does not have advanced protections.


So that’s a rundown in regards to this piece of the best free Firewall software in 2020. As I said before, each of these have their own strengths and weaknesses. It is up to your personal choices and requirements for you to win their hearts.

Although, as a general rule, it is always a better option to opt for paid versions of antivirus or firewall. Anyway, enough of me talking. Drop your two cents on this best free piece of Firewall, as well as your thoughts and questions in the comments.

Leave a Reply

Your email address will not be published.