8 Best Open Source Ad Blockers in 2026

Ads aren’t just annoying anymore. They slow page loads, drain laptop batteries, eat mobile data, track you across the web, and occasionally deliver malware. An ad blocker is one of the simplest ways to make the internet faster and safer.

But an ad blocker sees every page you visit, which makes trust essential. Some popular blockers let “acceptable ads” through for a fee, and others collect browsing data.

Open source ad blockers solve that problem: the code is public, the filter lists are community-maintained, and anyone can verify what the software actually does.

2026 also changed the landscape. Google finished removing Manifest V2 extensions from Chrome, which broke the classic version of the most popular ad blocker on the planet. Below are the eight open source ad blockers worth using now, what each does well, where each falls short, and who each one is for.

Quick Comparison: Best Open Source Ad Blockers

Rank	Ad Blocker	Best For	Works On	Blocking Level
1	uBlock Origin	Best overall	Firefox, Brave	Browser
2	uBlock Origin Lite	Chrome users	Chrome, Edge, Safari	Browser
3	Brave Shields	Built-in blocking, no extension	Brave browser	Browser
4	AdGuard Browser Extension	Polished Manifest V3 blocking	Chrome, Firefox, Edge, Opera	Browser
5	Pi-hole	Whole-home network blocking	Any device on your network	DNS
6	AdGuard Home	Network blocking with modern encryption	Any device on your network	DNS
7	Ghostery	Tracker insights plus ad blocking	Chrome, Firefox, Edge, Safari	Browser
8	RethinkDNS	Android system-wide blocking	Android	DNS + firewall

Before You Choose: What to Know

• Your browser matters more than ever. Chrome now only allows Manifest V3 extensions, which limit how aggressively blockers can filter. Firefox and Brave still support the full-strength approach.
• Edge is next. Microsoft began moving consumers off Manifest V2 in August 2026 and aims to finish by the end of the year, with enterprise following in early 2027.
• Browser blockers and network blockers do different jobs. Extensions remove ads and page clutter inside your browser. DNS blockers like Pi-hole cover every device on your network, including smart TVs and apps, but can’t remove ads served from the same domain as the content, like most YouTube ads.
• Beware lookalikes. Plain “uBlock” is not the same project as uBlock Origin and is best avoided.
• Open source doesn’t always mean fully free. Some companies open source their browser extension while selling closed-source desktop apps. We note where that applies.

1. uBlock Origin: Best Overall

uBlock Origin is a CPU- and memory-efficient, wide-spectrum content blocker, and it remains the gold standard every other ad blocker gets measured against.

What It Does Well

• The full version on Firefox remains the most powerful free browser extension available in 2026
• Supports a huge range of filter lists and even hosts files
• Offers an element zapper, a network logger, and per-site dynamic filtering for advanced users
• The developer says uBlock Origin works best on Firefox, where it keeps the full blocking API that Chrome removed
• Brave hosts the Manifest V2 version of uBlock Origin itself, so it still runs there too
• Completely free, and it famously refuses donations

Where It Falls Short

• The original version no longer works in current Google Chrome, and all remaining Manifest V2 extensions were removed from the Chrome Web Store on August 31, 2026
• Advanced features have a learning curve
• Updates for the Thunderbird version are stuck at an old release unless you install from GitHub

Who It’s For

• Anyone using Firefox or Brave who wants the strongest, lightest ad blocking available

2. uBlock Origin Lite: Best for Chrome Users

uBlock Origin Lite is Raymond Hill’s separate Manifest V3 extension, built from the ground up to work within Chrome’s new rules.

What It Does Well

• The official, actively maintained replacement for Chrome from the same developer as uBlock Origin
• Current desktop versions support custom filters and subscriptions to external filter lists, a big improvement over earlier releases
• Extremely lightweight and fully open source
• Also available for Safari on iPhone and iPad

Where It Falls Short

• The developer’s own FAQ says it can be less effective on sites using anti-ad-blocker techniques, because some filters can’t be converted into Manifest V3 rules
• The default mode isn’t the strongest, so switch to Complete mode after installing
• Chrome won’t migrate your old uBlock Origin settings automatically

Who It’s For

• Chrome users who want to stay on Chrome and still get trustworthy, free, open source ad blocking

3. Brave Shields: Best Built-In Blocker

Brave includes Shields, an ad and tracker blocker built directly into the browser, so there’s no extension to install.

What It Does Well

• Powered by Brave’s open source Rust engine, adblock-rust, which parses the same EasyList and EasyPrivacy filter syntax as uBlock Origin, including cosmetic filters and scriptlet injection
• Because Shields is patched into the browser itself, Manifest V3 doesn’t weaken it at all
• Still lets you install the Manifest V2 versions of uBlock Origin, AdGuard, NoScript, and uMatrix from its own backend
• The adblock-rust engine is good enough that other browsers, like Ladybird, have adopted it

Where It Falls Short

• You have to switch browsers to use it
• Lacks uBlock Origin’s network logger and per-site dynamic filtering
• Brave has faced past trust controversies, including a 2020 affiliate link issue and a 2021 Tor DNS leak, both since fixed

Who It’s For

• Anyone who wants strong ad blocking out of the box on a Chromium browser without juggling extensions

4. AdGuard Browser Extension: Best Polished Manifest V3 Blocker

AdGuard Browser Extension is a free, open source ad blocker that has adapted to Manifest V3 better than most.

What It Does Well

• GPL-3.0 licensed, with the current version 5.4.3.1 released in May 2026
• Supports both Manifest V2 and Manifest V3 across Chromium browsers, Firefox, Opera, and Edge
• Blocks ads and trackers while managing social widgets, banners, and video ads
• Uses a Quick Fixes system with dynamic rules to adjust to broken sites in real time
• A friendly interface plus the AdGuard Assistant tool

Where It Falls Short

• Manifest V3 enforces limits of at least 30,000 static rules per extension, with a cumulative cap of 330,000 across all extensions
• Filter rules are built into the extension and only update with the whole extension
• Only the browser extension is open source, since AdGuard’s standalone Windows and Mac apps are paid products

Who It’s For

• Chrome users who want a more feature-rich interface than uBlock Origin Lite

5. Pi-hole: Best for Whole-Home Network Blocking

Pi-hole is a network-wide ad blocker that runs on a Raspberry Pi, old PC, or Docker container and blocks ads for every device in your home.

What It Does Well

• Blocks ads and trackers on smart TVs, phones, tablets, game consoles, and apps, not just browsers
• Version 6 built a REST API and web server directly into the core binary, eliminating lighttpd and PHP for a smaller, faster install
• Added native HTTPS and subscribed allowlists, plus a single commented configuration file
• The July 2026 release finally added a proper DHCP static lease editor and closed six security advisories
• A huge community and years of proven reliability

Where It Falls Short

• DNS blocking can’t remove ads served from the same domain as the content, like most YouTube ads
• Requires some technical setup and a device that stays on 24/7
• If your Pi-hole goes down, so does name resolution for your network unless you configure a fallback

Who It’s For

• Households that want to block ads on every device, including smart TVs and apps that browser extensions can’t reach

6. AdGuard Home: Best Network Blocker With Modern Encryption

AdGuard Home is an open source, network-wide ad and tracker blocking DNS server and one of the most popular alternatives to Pi-hole.

What It Does Well

• A hugely popular project with more than 25,000 GitHub stars
• Built-in support for encrypted DNS protocols and per-client settings
• Recent updates automatically reload TLS certificates when they change and added new statistics options
• Ships as a single binary that’s easy to run on almost anything, including Docker

Where It Falls Short

• Like Pi-hole, it can’t block ads served from the same domain as the content
• Less community documentation and fewer third-party tools than Pi-hole
• Keep it updated, since recent releases have included several security fixes

Who It’s For

• Home lab users who want network-wide blocking with encrypted DNS built in from the start

7. Ghostery: Best for Tracker Insights

Ghostery combines ad blocking with detailed visibility into who’s tracking you on every site.

What It Does Well

• All features are free, including ad blocking, tracker blocking, cookie consent banner handling, and tracker insights
• Shows how many trackers are on each site, what type they are, and which company runs them
• Actively developed, with recent updates adding a notification when YouTube ads slip through and blocking of “Allow notifications?” pop-ups
• The latest Firefox version is released under the GPL-3.0

Where It Falls Short

• Ghostery went closed source for a period starting in 2016 before returning to open source in 2018, which some users still remember
• One review found it struggled most with Google ads and analytics
• Less customizable than uBlock Origin

Who It’s For

• Privacy-minded users who want to see exactly who’s tracking them, not just block ads silently

8. RethinkDNS: Best for Android

RethinkDNS is an open source Android app that combines encrypted DNS, ad blocking, and a per-app firewall.

What It Does Well

• Supports DoH, DoT, and DNSCrypt encrypted DNS with a per-app firewall and 190+ blocklists
• Blocks ads and trackers across all your apps, not just the browser
• The firewall lets you decide which apps can reach the internet at all
• No account required, with on-device query logging

Where It Falls Short

• The interface takes time to learn
• It uses Android’s VPN slot, so running it alongside a real VPN requires workarounds
• Like other DNS blockers, it can’t remove ads served from the same domain as the content

Who It’s For

• Android users who want system-wide blocking and control over which apps talk to the internet

How to Choose the Right Ad Blocker

• Use Firefox: uBlock Origin
• Want to stay on Chrome: uBlock Origin Lite or AdGuard Browser Extension
• Want blocking without extensions: Brave with Shields
• Want to cover every device at home: Pi-hole or AdGuard Home
• Want to see who’s tracking you: Ghostery
• On Android: RethinkDNS, or Firefox for Android with uBlock Origin
• Want maximum coverage: Pair a browser blocker with Pi-hole or AdGuard Home

Frequently Asked Questions

Does uBlock Origin Still Work on Chrome?

• No. The original version no longer runs in current Chrome. Chrome users should install uBlock Origin Lite, or switch to Firefox or Brave for the full version.

Can These Tools Block YouTube Ads?

• Browser extensions like uBlock Origin and Brave Shields handle YouTube ads best. DNS blockers like Pi-hole and AdGuard Home generally can’t, because YouTube serves ads from the same domains as videos.

Is AdGuard Open Source?

• Partly. The AdGuard Browser Extension and AdGuard Home are open source, but AdGuard’s standalone desktop and mobile apps are paid products.

How Do I Block Ads on My iPhone?

• uBlock Origin Lite is available for Safari on iPhone and iPad. For in-app ads, route your home network through Pi-hole or AdGuard Home.

Can I Use a Browser Blocker and Pi-hole Together?

• Yes, and many people do. Pi-hole handles network-wide blocking for every device, while a browser extension cleans up cosmetic elements and same-domain ads.

Bottom Line: For most people, uBlock Origin on Firefox is still the best open source ad blocker in 2026, delivering the strongest blocking with the lightest footprint. Chrome users should switch to uBlock Origin Lite, or consider Brave, whose built-in Shields aren’t affected by Manifest V3 at all. To block ads on every device in your home, including smart TVs and apps, add Pi-hole or AdGuard Home to your network. Whichever you choose, stick to trusted open source projects, because an ad blocker sees everything you browse.