What is Content Filtering?

Types, Methods, and Use Cases

Content filtering is the process of controlling what content is accessible on a network. It can be achieved using software, hardware, or cloud-based services and is used by parents, schools, businesses, and governments to restrict access to unwanted or harmful content.

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Step 1: What is Content Filtering?

Content filtering is the process of defining what is and is not acceptable on a network. Although commonly associated with censorship, there are many legitimate reasons for implementing it:

  • Parents protecting children from inappropriate content
  • Schools providing safe browsing experiences (CIPA compliance)
  • Businesses reducing distractions and blocking security threats
  • Individuals managing personal content consumption habits

Step 2: Types of Content Filtering

Network-Based Filters

Filtering happens at the network level — at the router, via a DNS service, or at the ISP. CleanBrowsing is a network-based filter that operates at the DNS level, making it device-agnostic and effective across your entire network.

Browser-Based Filters

Filtering happens inside your web browser using extensions or built-in features. The limitation is that users can switch browsers or disable extensions.

Application-Based Filters

Software installed on a device intercepts and filters requests. Antivirus programs and parental control applications often include this. It covers all applications on the device, not just the browser.

Service-Based Filters

Built into specific platforms — search engines offer SafeSearch, social platforms have content restrictions, and video platforms offer restricted modes. Useful but limited to the specific service.

Step 3: Why Content Filtering Matters

  • Inappropriate Content — Blocks pornography, violence, hate speech, and other harmful content
  • Malicious Sites — Prevents access to phishing, malware, and data-stealing domains
  • Productivity Loss — Restricts social media, gaming, and streaming during work hours
  • Regulatory Compliance — Helps schools and libraries meet CIPA requirements
  • Network Security — Blocks command-and-control communications and provides network visibility

Step 4: Content Filtering with CleanBrowsing

CleanBrowsing is a network-based DNS filtering service. We believe this is the most effective approach because it is agnostic to the device, operating system, or application. It sits at the edge of the network and inspects every domain request.

We offer three free filters and paid plans with 19+ content categories, custom rules, and activity monitoring.

To learn more, visit our Getting Started page or contact us at sales@cleanbrowsing.org.

CleanBrowsing makes content filtering easy and affordable.

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