More Than Just an Ad Blocker
When most people think of AdGuard, they think of ad blocking. And while that is its primary function, AdGuard is also a comprehensive privacy protection tool with features that rival dedicated privacy software. From stripping tracking parameters to blocking browser fingerprinting, AdGuard offers multiple layers of privacy protection that many users are not even aware of.
In this article, we will explore the privacy features built into AdGuard across its products and explain why each one matters for your online privacy.
Stealth Mode: Your Privacy Command Center
Stealth Mode is a collection of privacy-enhancing features available in AdGuard for Desktop, Android, and the browser extension. Think of it as your privacy command center, where each toggle addresses a specific tracking technique used by websites and advertisers.
Hide Your Search Queries
When you click a search result in Google, Bing, or another search engine, the destination website can see what you searched for through the HTTP Referer header. AdGuard's "Hide your search queries" feature strips this information, so websites only know you came from a search engine but not what you searched for.
Strip Tracking Parameters from URLs
Many URLs contain tracking parameters like utm_source, fbclid, gclid, and others. These parameters don't affect the page you see but allow companies to track your journey across the web. AdGuard automatically removes these parameters from URLs, breaking the tracking chain.
Common tracking parameters that AdGuard strips include:
utm_source,utm_medium,utm_campaign- Google Analytics trackingfbclid- Facebook click identifiergclid- Google Ads click identifiermsclkid- Microsoft Ads click identifiermc_eid- Mailchimp email trackingyclid- Yandex click identifier
Self-Destructing Cookies
Third-party cookies are one of the primary mechanisms for cross-site tracking. AdGuard can block third-party cookies entirely, but this may break some websites. A more balanced approach is the self-destructing cookies feature, which allows cookies to be set but automatically deletes them after a specified period (for example, after the browser tab is closed).
Tracking Protection Filter
The AdGuard Tracking Protection filter is a specialized filter list that targets tracking scripts and analytics services. Unlike ad-blocking filters that focus on visible advertisements, this list targets the invisible tracking infrastructure that monitors your behavior across the web.
Did you know? The average website loads 5-15 third-party tracking scripts. These scripts can monitor your mouse movements, record your scroll behavior, track how long you spend on each section, and even create detailed profiles of your browsing habits across different websites.
What Gets Blocked
- Analytics services - Google Analytics, Adobe Analytics, Mixpanel, and others
- Session replay tools - Hotjar, FullStory, and similar services that record your screen
- Advertising pixels - Facebook Pixel, Google Ads conversion tracking, and retargeting pixels
- Fingerprinting scripts - Scripts that attempt to identify your browser through its unique characteristics
Browser Fingerprinting Protection
Browser fingerprinting is a sophisticated tracking technique that identifies users without cookies. It works by collecting dozens of data points about your browser and device, such as your screen resolution, installed fonts, WebGL capabilities, and audio processing characteristics. Combined, these create a unique fingerprint that can identify you with high accuracy.
AdGuard combats fingerprinting in several ways:
- Blocking fingerprinting scripts - Known fingerprinting libraries are blocked by filter rules
- API restrictions - Stealth Mode can block access to APIs commonly used for fingerprinting, such as the Canvas API and WebGL
- WebRTC leak prevention - Prevents your real IP address from leaking through WebRTC, which is used by some fingerprinting techniques
DNS Privacy
Your DNS queries reveal every website and service you connect to. Without encryption, these queries are visible to your ISP, network administrator, and potentially other eavesdroppers. AdGuard products support encrypted DNS protocols to protect this information:
| Protocol | Port | Supported By |
|---|---|---|
| DNS-over-HTTPS (DoH) | 443 | All AdGuard products |
| DNS-over-TLS (DoT) | 853 | AdGuard Home, Android, iOS |
| DNS-over-QUIC (DoQ) | 853 | AdGuard Home, Desktop |
| DNSCrypt | 443/5443 | AdGuard Home, Desktop |
HTTPS Filtering and Privacy
AdGuard's HTTPS filtering is primarily used for ad blocking, but it also has significant privacy implications. By inspecting encrypted traffic, AdGuard can block tracking requests that would otherwise be invisible because they are hidden inside HTTPS connections. Most trackers have moved to HTTPS specifically to evade detection by network-level monitoring tools.
AdGuard handles HTTPS filtering responsibly by using a locally generated certificate authority that stays on your device. No private keys are shared with AdGuard or any third party. The traffic is decrypted, inspected, and re-encrypted locally without ever leaving your device in an unencrypted state.
Protection Against Phishing and Malware
Privacy and security go hand in hand. AdGuard includes protection against phishing websites and malware distribution sites using its Browsing Security module. This feature checks URLs against a database of known malicious websites and warns you before you visit them.
Unlike some competitors that send every URL you visit to a cloud service for checking, AdGuard uses a privacy-first approach. It downloads a compact version of the malicious URL database to your device and performs lookups locally. Only if a potential match is found does it send a hash prefix (not the full URL) to the server for verification.
What AdGuard Does NOT Collect
An ad blocker that collects your data would be ironic at best and malicious at worst. AdGuard maintains a clear privacy policy about what it does and does not collect:
- No browsing history - AdGuard does not log which websites you visit
- No personal data - No names, email addresses, or identifying information
- No selling data - AdGuard's business model is software licenses, not data sales
- Minimal analytics - Only anonymous crash reports and usage statistics, which can be disabled
Building a Complete Privacy Stack
For maximum privacy, consider combining AdGuard with other privacy tools:
- AdGuard + encrypted DNS - Blocks ads and trackers while protecting DNS queries
- AdGuard + VPN - Adds IP address anonymization (AdGuard VPN integrates natively)
- AdGuard + privacy-focused browser - Firefox with strict tracking protection or Brave
- AdGuard + password manager - Unique passwords prevent cross-site account linking
Each layer addresses a different aspect of privacy. AdGuard handles ads, trackers, and DNS privacy. A VPN masks your IP address. A privacy-focused browser reduces fingerprinting surface. Together, they create a robust privacy stack that makes tracking you significantly more difficult for advertisers and data brokers.
Remember that no single tool can guarantee complete privacy online, but AdGuard's extensive privacy features put you far ahead of the average internet user when it comes to protecting your personal information and browsing habits.
