How to Block Ads on Any Device or Browser
Online ads range from mildly annoying to genuinely harmful. Some slow down page loads, consume mobile data, track your behavior across the web, or serve as delivery mechanisms for malware. Blocking them isn't just about comfort — for many users, it's a practical security and performance decision.
Here's how ad blocking actually works, what your options are, and what determines which approach fits your situation.
How Ad Blocking Works
At its core, ad blocking involves intercepting requests before they reach your browser or device. When you load a webpage, your browser sends dozens of requests — some to the actual site, others to third-party ad servers, tracking scripts, and analytics platforms. Ad blockers identify and cancel the requests going to known ad-serving domains before they load.
There are three main places this interception can happen:
- In the browser — via an extension that filters requests at the tab level
- On the device — via a system-level app that filters traffic for all apps
- On the network — via a DNS-based tool that blocks ad domains for every device on your Wi-Fi
Each layer works differently and catches different things.
Browser Extensions (Most Common Approach)
Browser-based ad blockers are the most widely used method. They install as extensions in Chrome, Firefox, Edge, Safari, or Brave and filter out ads, trackers, and pop-ups on websites you visit.
They work using filter lists — regularly updated databases of known ad-serving domains and scripts. When your browser tries to load something on that list, the extension blocks it silently.
Common filter lists include EasyList, EasyPrivacy, and uBlock's own curated lists. Most ad blockers let you add or remove lists, giving you control over how aggressively they filter.
What they do well:
- Block ads within web pages
- Remove tracking scripts
- Speed up page load times significantly on ad-heavy sites
- Optionally block cookie consent banners and social trackers
What they don't cover:
- Ads inside apps (Spotify, YouTube app, Instagram)
- Ads on other devices sharing your network
- Tracking done at the OS level
System-Level Blocking on Mobile
On iOS, Safari supports content blockers — lightweight extensions that filter web content. These aren't as flexible as desktop browser extensions but work well for Safari users. Apps outside Safari (like YouTube or social apps) are unaffected.
On Android, options include browsers with built-in blocking (Brave, Firefox with extensions) and VPN-based apps that route traffic through a local filtering tunnel. These can block ads across more apps, not just the browser, depending on how they're implemented.
The trade-off with VPN-based blockers on mobile: they occupy your device's VPN slot, which means you can't simultaneously run a separate VPN for privacy or security. 🔒
DNS-Level Blocking (Network-Wide)
DNS-based ad blocking works by redirecting or refusing to resolve domain names associated with ad servers. Instead of blocking ads inside a browser, you're telling your entire network not to connect to those domains at all.
Tools like Pi-hole (self-hosted on a local device) or cloud-based DNS services apply this filtering to every device on your network — phones, smart TVs, game consoles, laptops — without installing anything on each device.
| Method | Scope | Setup Complexity | App Ad Coverage |
|---|---|---|---|
| Browser extension | That browser only | Low | No |
| Mobile content blocker | Safari or one app | Low | No |
| VPN-based app blocker | Most apps on device | Medium | Partial |
| DNS-level blocking | Entire network | Medium–High | Partial |
DNS blocking is powerful but not a complete solution. It can't block ads that are served from the same domain as the content you're requesting — a pattern YouTube and some streaming platforms specifically use to make ad blocking harder.
What Makes Ad Blocking Harder in Certain Cases
Streaming services and apps are the toughest cases. Platforms like YouTube, Hulu, and Spotify serve ads from their own infrastructure or inject them server-side, so client-side filters can't easily separate "ad" from "content." Some browser extensions have workarounds, but these are locked in an ongoing technical back-and-forth with platform updates.
Acceptable Ads programs are worth knowing about: some ad blockers allow non-intrusive ads from paying advertisers by default. This is a deliberate policy choice, not a technical limitation — and it can usually be disabled in settings.
Anti-ad-block detection is increasingly common on major sites. Some sites detect blockers and refuse to show content until you disable them. Whether you comply is your call, but it's a real friction point.
The Variables That Shape Your Setup 🖥️
Which approach makes sense depends on several personal factors:
- Primary device and OS — Desktop users have the most flexibility; iOS users have the most restrictions
- Where ads bother you most — Web browsing vs. apps vs. streaming requires different tools
- Technical comfort level — Browser extensions are nearly zero effort; Pi-hole requires router access and basic networking knowledge
- Privacy goals — Blocking ads and blocking trackers are related but not identical; some users need deeper filtering than a basic ad blocker provides
- Shared network — DNS-level blocking affects everyone on the network, which may or may not be what you want
The method that handles ad blocking completely and transparently for one user may be overkill — or not enough — for another. What you're actually trying to block, on which devices, with how much maintenance tolerance, determines where the right balance sits for your specific setup.