What is Content Filtering

Content Filtering is the set of methods that is used to block and filter online contents that are considered objectionable.

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What is Content Filtering?


The content published on web pages may be filtered by a set of different methods. These online contents are considered objectionable from the rule that blocks (filters) the content. Content Filtering applications are used by a variety of users such as companies, organizations (government and private), parents, schools, libraries and many other authority who control the access to online resources. The filtering activity can be performed at various levels of internet infrastructure: on the content provider server, ISP, corporate network or home network or end device. Usually a combination of these levels are used by different entities to perform the blocking or filtering. The term web content filtering or internet content filtering is also used to refer to filtering of contents on web sites. Various different naming for similar service exist, such as parental control, content control, online content control etc...

What is the purpose of Content Filtering?


The content generated by an online platform may be objectionable for some audience types. In a corporate environment, a company may have a standard IT practices that do not allow gambling, or adult content to be consumed by its employees. Similarly a school administration may put in place some filtering rules that will block access to some social media platforms, or sites that include violence, hate speech or gun related substances. A parent may want to protect his/her children from many contents online that may include any kind of visually disturbing content. ISPs and governments may also implement content filtering techniques to some platforms which are objectionable based on their policy or legislation.

How does Content Filtering Work?


There are various aspects of content filtering when considering how does it work? The blocking or filtering can be performed on web site contents through domain, ip address, url or within a website as item filtering. The latter one is usually called Selective Content Filtering as well. Additionally, emails can also be filtered based on the decision email servers is providing such as spam, phishing or distracting content. For the location where content filtering is performed we can classify as follows:

Server Based Filtering:


The content server may implement content filtering in order to prevent the transfer of malicious or objectionable content. Malicious or harmful content are usually found on server applications where user-generated contents are being uploaded by end users, and the server administration has to control all uploaded content against files that may include malware (malicious software), spam, scam or related software before distributing to other end users. Similarly, objectionable content are also scanned on servers depending on the policy the server implements. Another server based content filtering method is antispam and antiphishing solutions, where the emails are filtered based on their contents

Internet Service Provider (ISP) Level Filtering:


ISPs share some of the responsible for the content they are transmitting from servers to end users. Althought the responsibility is always a dispute between ISPs, servers and end users, they are usually held accountable by jurisdiction when an incident happens. ISPs can perform network level filtering since they are dealing with packets and can stop domains, urls or ip addresses. These services will also be provided as cloud based solutions and they provide dns filtering as a method of content filtering.

Network Level Content Filtering


Corporations perform content filtering on their corporate networks in order to protect their assets, reduce the bandwidth utilization and keep the productivity of their employees higher. Similarly, parents can utilize filtering tools on network devices such as ADSL or Switches that are being provided by ISPs for internet access, or can setup home firewall hardware or software to protect their children from accessing harmful content.

Content Filtering on Search Engines


Search engines such as Google, Bing or Yahoo provide capabilities to end users to filter some of the search results. This technology is called SafeSearch for all the major search engines, and provides filtering of sexually explicit contents from search results.

Content Filtering on End Device


The last location where content filtering can be implemented is on the end device, such as a PC, laptop, mobile device. There are various type of application on end devices that can filter content. These are:

  • Browser Extensions: A specific browser extension can block harmful content. That type of filtering will work for all browsing activities.

  • Native application: an application that will listen to network activities can also block traffic going in and out. This type of application usually implement an interception mechanism that listens all network related activities and block contents that are not confirming to predefined rules. This type of implementation struggle with HTTPS traffic where end-to-end encryption between server and browser is needed.

  • Firewall: similar to native application, firewall applications can block traffic based on ip, port and domain

  • Email Clients: Filtering can also be performed within an email client application in order to block malicious or spam emails.

Personal Content filtering


In the recent years, there is an increasing trend of using content filtering applications to self control or limit access to contents that may have some damage. Porn addicts is one such example where users benefit from filtering systems as a mechanism to protect themselves. Another use case is to increase productivity, and reduce the distraction that some content providers such as social media networks can generate continuously.

Types of content filtering


These type of applications may block an entire domain (such as "facebook.com") or certain urls (such as "https://www.facebook.com/groups/FirearmEnthusiasts/"), or a multimedia/document within a web page. The latter type is called Selective Content Filtering and can improve the experience of many audience by filtering only the harmful content without impacting other contents on the same domain or url. The typical use case for Selective Content Filtering is on social media platforms such as Facebook, Twitter, Snapchat where the domain or url based filtering would not be practical, but a specific disturbing content may be filtered easily and can be hidden from user visibility.

Selective Content Filtering


Selective Content Filtering is a method of selectively filtering, and blocking online contents that are offensive, explicit or objectionable within a website while allowing other non-harmful content to be loaded and displayed to the user without interference.

The typical use case for Selective Content Filtering is on social media platforms such as Facebook, Twitter, Snapchat where the domain or url based filtering would not be practical, but a specific disturbing content may be filtered easily and can be hidden from user visibility.




How Net Filter Pro Can Help


Our browser extension provides the only Selective Content Filtering capability in the industry. Using our extension, end users will not have to block domains or urls, The online contents that include pornography, violence, hate speech, drug related or gun related contents will be filtered out, and safe content will still be presented to the user. If you want to get more information about Net Filter Pro extension, or give it a try, please visit:

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Net Filter Pro is an advanced content filtering

We understand the need, and we developed a technology that does not block popular platforms, but smartly filters only harmful content.

  • Parents Get The Control Back

    The parents decide which content their children will see, without limiting them

  • Selective Content Filtering on Mainstream Platforms

    The harmful content is filtered, and clean contents are still allowed

  • User Experience Is Intact

    The user experience is not affected at all. The selective filtering applies only to the context it is related, not the whole website

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Frequently Asked Questions

We develop technologies for a better online experience

Our aim is to protect younger generation against online threats, and provide them the opportunity to still access any online resource that is not dangerous.

Internet is full of potential for the growing future adults, and we believe we can provide them a great technology which enables them to access clean and harmless content, while blocking and hiding out harmful and objectionable content, all at the same time without the need to completely block all websites or platforms . For any question or comments, please contact us via:

Email: netfilterpro@netfilterpro.com
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How Does It Work?

Most of the famous and commonly used websites such as Google, Twitter, Youtube, Facebook cannot be classified as totally harmful or totally clean. As a parent, you would like to allow your children or even yourself to see the good content on these platform, while blocking the bad and harmful content.

We believe our technology is unique, yet simple. We simply allow all such websites to render, but analyze parts of the website and filter out that part only, leaving all the other content untouched. We call our technology 'Selective Content Filtering'

What's The Benefit?

Completely blocking a website would restrict your children to get the benefits of these websites. Preventing access to Google search results, or Google Images results, Youtube videos could be an option for parents, but that will hinder their learning. Also, if children are not allowed to access these websites, they will quickly find alternatives which provide same or worse contents.

Filtering out only harmful content, while preserving the good content and allowing to access all websites is a great way for both protecting the children, but also allow them to get the full potential of the Internet .

How Do You Define 'Harmful Content'?

The online contents that include pornography, violence, profanity, hate speech, drug related or gun related materials are considered harmful content.

Also, our database is updated regularly with new input that defines further what is harmful according to parents.

Which Content Types Are Filtered Out?

All textual content are analyzed and filtered out. For most of the popular platforms, the image contents are also analyzed and filtered out with image processing.

The analysis of text and images are performed based on harmful content definition, which are part of the application

Will The User Notice The Usage Of This Application?

The user will not notice that some contents are filtered out. All the filtering happens in the background, and the content is simply hidden from user interaction, thus they don't even know that filtering is implemented.

Based on user selection, you may chose to overlay an image on top of the filtered content, but that's optional. The default behavior is to hide out.

Can I View Which Websites My Child Visited?

Yes, you may create an account here My Account and connect your child device. Then all page visits of your child will be listed under your account.