How to Block Advertisements on Any Device or Browser

Online ads range from mildly annoying to genuinely disruptive — slowing down page loads, consuming mobile data, and in some cases delivering malware through a practice called malvertising. Blocking them isn't just about comfort; for many users it's a legitimate performance and security decision. The right approach, however, depends on where you're browsing, what device you're on, and how much control you want over the process.

How Ad Blocking Actually Works

Before choosing a method, it helps to understand the mechanics. Ads are served through a chain: a webpage requests content from an ad network, which returns display ads, video pre-rolls, or tracking scripts. Ad blockers interrupt this chain at different points depending on their type.

Browser extensions intercept network requests before they render, comparing URLs against blocklists like EasyList or uBlock's filter sets.
DNS-level blockers resolve ad-serving domain requests to a dead end before any connection is made — this works across your entire network, not just one browser.
Hosts file modification works similarly to DNS blocking but locally on a single device, redirecting known ad domains to a null address (usually 127.0.0.1).
Built-in browser features use lightweight filtering baked into the browser itself, often following standards like the Better Ads Standard rather than full blocklists.

Each method has a different scope, different technical requirements, and different tradeoffs.

Blocking Ads in a Desktop Browser 🖥️

The most common approach for desktop users is a browser extension. Extensions like uBlock Origin, AdBlock, and AdGuard operate at the request level and support custom filter lists. uBlock Origin, in particular, is widely regarded for its low memory footprint compared to other extensions — it uses static filtering rather than dynamic element hiding wherever possible.

Key factors that affect extension performance:

Filter list size — more lists mean broader blocking but higher memory use
Browser compatibility — Manifest V3 changes in Chromium-based browsers (Chrome, Edge, Brave) are limiting how extensions can intercept requests; Firefox retains fuller support for the older Manifest V2 API
Whitelist management — many users selectively allow sites they want to support

Some browsers (Brave, Firefox Focus, LibreWolf) include aggressive ad blocking by default with no extension needed.

Blocking Ads on Mobile Devices 📱

Mobile ad blocking is more fragmented because mobile operating systems handle apps and browsers differently.

On Android:

Chromium-based mobile browsers support extensions with varying degrees of support
Firefox for Android supports uBlock Origin and similar extensions
Third-party browsers like Brave include built-in blocking
DNS-based blocking apps (like AdGuard for Android or Blokada) can block ads system-wide, including inside apps — not just browsers

On iOS:

Safari supports Content Blockers via the App Store — these are purpose-built filtering apps that hook into Safari's blocking API
Third-party browsers (Brave, Firefox) include their own blocking
iOS does not allow the same level of system-wide DNS control without a VPN profile or dedicated app using Apple's Network Extension framework

Blocking ads inside apps (not browsers) is significantly harder on both platforms. App-level ads are often loaded from the same domains as legitimate app content, making blocklist-based filtering risky. DNS-level tools are the most practical option here, but they're not foolproof.

Network-Level Ad Blocking

For users who want to block ads across every device on a network — smart TVs, game consoles, phones, laptops — a DNS sinkhole approach is more effective than per-device configuration.

Pi-hole is the most well-known open-source implementation. It runs on a Raspberry Pi or any local server, acting as the DNS resolver for your entire network and blocking requests to known ad and tracking domains. Setup requires some comfort with networking concepts: you'll need to point your router's DNS settings to the Pi-hole's local IP address.

Cloud-based alternatives (NextDNS, ControlD, AdGuard DNS) offer the same DNS-level blocking without local hardware — you configure your device or router to use their DNS servers instead. These are easier to set up but involve routing your DNS queries through a third-party server, which has its own privacy implications worth understanding.

Method	Scope	Technical Skill Required	Blocks In-App Ads
Browser extension	Single browser	Low	No
Built-in browser blocking	Single browser	None	No
DNS app (mobile)	Whole device	Low–Medium	Partially
Pi-hole (local)	Whole network	Medium–High	Partially
Cloud DNS filtering	Whole device/network	Low–Medium	Partially

Variables That Change the Right Answer

The method that works well for one user can be overkill or insufficient for another. Several factors shape which approach makes sense:

Device ecosystem — iOS limits system-wide options more than Android does
Technical comfort — DNS-level tools require router or network configuration knowledge
Privacy priorities — cloud DNS services see your query traffic; local solutions keep it on your hardware
Use case — casual browsing needs are different from a household with IoT devices, streaming sticks, and gaming consoles
Browser choice — switching to a browser with native blocking (Brave, Firefox with uBlock Origin) is often the path of least resistance

There's also the question of filter list aggressiveness. Overly broad blocking can break web functionality — login flows, embedded video players, payment processors — requiring manual whitelisting or troubleshooting. More targeted lists reduce false positives but may miss newer ad domains.