Kerio Personal Firewall represents smart, easy-to-use personal security technology that fully protects personal computers against Internet threats. Network Intrusion Detection actively blocks most known attacks, while Host-Based Intrusion Prevention keeps trusted applications from being corrupted by malicious programs. Web filter protects private information from spyware and blocks annoying popup windows.


Kerio Personal Firewall is FREE for home and personal use. For corporate use please see the pricing and licensing policies section.
For home users, Kerio Personal Firewall 4 is available in two flavors - the full edition and the limited free edition.
After installation, KPF works as the full edition for 30 days, after which it becomes the limited free edition.

Limited free edition does not provide the content filtering capabilities such as blocking pop-up windows, ads, VB scripts, cookies, etc. and other extra features. Please see the comparison table for more details.

Knowledge Base
Our Knowledge Base has answers to common questions.


Software updates
We strongly recommend installing the latest version of product from our download site as we regularly post improvements, including minor features and fixes.

Either activate the Update Checker built into the product or periodically check for newer builds on this page and install them directly over the existing version. All configuration settings will be retained.

Upgrade from KPF 2.1
When upgrading from Kerio Personal Firewall 2.1, we recommend that you install Kerio Personal Firewall 4 directly over the previous version. The installation of KPF 4 will retain all applicable settings from the previous version. However, you may need to configure setting for features that were not part of version 2.1.


Keep Updated!
Are you interested in hearing the latest from Kerio? From product updates to useful tips for getting the most out of our products? If so, it is easy to stay informed.
Send us your e-mail address and we will keep you posted!

Kerio Personal Firewall is the Freeware version. The full version can be purchased by clicking on the "CLICK HERE TO ORDER" button below for around  45.00USD.