How to Block AI Content in Google Search Results

How do you block AI content in Google search results?

You block AI content in search results by combining Google's own udm=14 web-only filter, a browser extension like uBlock Origin loaded with an AI-content blocklist, and, if you want a structural fix instead of a patch, a search engine that filters AI slop by default, such as Kagi or DuckDuckGo. None of these does the job alone. Stacked together, they get you most of the way to a clean results page.

Here's how each one works, how to set it up, and when you need more than one.

Why are your search results drowning in AI content?

This isn't a vibes problem. It's measurable.

Independent research firm Graphite tracked a Common Crawl sample and found AI-generated articles overtook human-written ones online around November 2024, with the AI share plateauing near 50 to 52% of newly published articles by mid-2025. Ahrefs ran its own check in April 2025, crawling 900,000 newly created web pages, and found 74.2% contained some AI-generated content, including 2.5% that were "pure AI." A companion survey in that same study found 87% of content marketers admit to using AI to create or assist their content.

The good news: AI content mostly doesn't rank well. That's exactly why it reads as noise instead of the answer you were looking for. Graphite's separate study of search and answer-engine results found 86% of articles ranking in Google Search are human-written, only 14% are AI-generated, and just 7% of #1-ranked results are AI-generated. The problem isn't that AI content wins. It's that there's so much of it that it clutters the middle and bottom of the page, and it's increasingly hard to tell at a glance which result is which.

The same pattern shows up off of Google. A Kapwing study of the 15,000 most popular YouTube channels found more than 20% of videos recommended to brand-new accounts were AI slop, and 278 channels made up entirely of AI slop pulled in an estimated $117 million a year in ad revenue between them. If you've already gone down that road, here's what actually blocks AI slop in your YouTube feed. The fix for search follows the same logic: stop relying on the platform to label it for you, and start filtering it yourself.

What is Google's udm=14 parameter, and how do I use it?

Google already has a mode that strips AI Overviews out entirely, and it's not a hack. It's Google's own "Web" filter, triggered by a URL parameter: udm=14.

Here's how to use it:

1. Run a one-off search. Append &udm=14 to the end of any Google search URL and reload. You'll get the classic 10 blue links, no AI Overview box.
2. Make it permanent in Chrome. Go to Settings > Search engine > Manage search engines. Add a new site search entry with the URL https://www.google.com/search?q=%s&udm=14, then set it as your default.
3. Make it permanent in Firefox. Go to Settings > Search, add a custom search engine with the same URL pattern, and set it as default.
4. Make it permanent in Edge. Settings > Privacy, search, and services > Address bar and search > Manage search engines, same URL pattern.

One tester ran 214 searches over seven days before setting this up and got an AI Overview on 97 of them, roughly 45%. After setting udm=14 as the default, AI Overviews appeared on zero of 214 follow-up searches. It's the cheapest fix on this list: no install, no permissions, no maintenance.

Can search operators dodge AI clutter before you install anything?

If you don't want to touch your default search engine settings, Google's existing operators get you partway there without installing anything.

• Date filters. Use Tools > Any time > Custom range, or append before:2022-11-30 to a query, to push results back before ChatGPT's public launch. This is the same logic behind the Slop Evader extension, covered below.
• Keyword exclusion. Append -"AI generated" or -"written by AI" to push out pages that self-identify, though most AI content doesn't label itself and this catches a small slice.
• Site exclusion. Use -site:example.com to drop specific domains you've already identified as AI-content farms from your results.
• Combine operators. Stack a date filter with a few -site: exclusions for a tighter, if narrower, result set.

Operators are free and instant, but manual. You rebuild the filter every time you search instead of setting it once.

Which browser extensions block AI content automatically?

For a set-it-and-forget-it approach, three tools do most of the heavy lifting.

1. uBlock Origin + the HUGE AI Blocklist. The uBlockOrigin-HUGE-AI-Blocklist project curates more than 1,000 sites known for AI-generated imagery, maintained by community contributors, and ships optional keyword filters that block result snippets containing terms like "Midjourney," "Stable Diffusion," or "AI generated" on Google, Bing, and DuckDuckGo. Install uBlock Origin, then add the list's URL as a custom filter subscription in its settings.
2. Google_AI_Overviews_Blocker. This open-source extension, with more than 150 stars on GitHub, hides the AI Overview box specifically, using a lightweight script that targets its container on the page. It's narrower than a blocklist but does one job cleanly, and it's available for Chrome and Firefox.
3. Slop Evader. Built by artist and researcher Tega Brain, this extension filters results to only show content published before November 30, 2022, ChatGPT's launch date, and applies that filter across Google, DuckDuckGo, Reddit, Stack Exchange, Quora, Pinterest, YouTube, and Mumsnet. It's blunt by design: anything after the cutoff gets dropped, AI-written or not. That's the tradeoff for not needing a maintained blocklist.

The tradeoff across all three: blocklist-based tools need periodic updates as new AI-content sites appear, while date-cutoff tools like Slop Evader never need updating but also filter out legitimate human content published after 2022.

How do you build your own filter with uBlock Origin?

If you'd rather not depend on someone else's list, uBlock Origin lets you write your own cosmetic filters: rules that hide specific elements on a page by targeting their CSS selectors, plus simple keyword rules that hide any result containing a phrase you specify. You can also subscribe to the community blocklist above and layer your own rules on top of it, which is how most people who go this route actually run it: borrow the base list, add exceptions as you find them.

A filter you wrote and understand doesn't change underneath you when a vendor pivots. The cost is maintenance time. You're the one who has to notice when a new slop site shows up and add it.

Which search engines filter AI content by default?

If patching Google feels like whack-a-mole, two alternatives build the filter into the engine itself.

• DuckDuckGo added a built-in AI-image filter in July 2025 that uses community-maintained blocklists, including the uBlock Origin project above, to detect and hide AI-generated images in search results. There's also a dedicated mode at noai.duckduckgo.com that turns off all AI features and filters AI images site-wide.
• Kagi launched SlopStop in November 2025, a community-driven reporting system where any user can flag AI-generated text, images, or video. If a domain primarily publishes AI content, Kagi downranks it and labels it. If a mixed site has individual AI-generated pages, those get flagged without punishing the whole domain.

Kagi is a paid subscription; DuckDuckGo is free. Neither requires you to maintain anything yourself.

Which method should you actually use?

Pick based on how much effort you want to spend versus how much control you want.

1. If you want zero setup and zero cost: use udm=14, set once as your default search engine. It's Google's own filter, so there's nothing to maintain and nothing that will break when Google updates its layout.
2. If you want automatic filtering across image and text results: install uBlock Origin with the HUGE AI Blocklist. It covers more ground than udm=14 alone but needs occasional list updates.
3. If you want to avoid AI content categorically, not just AI Overviews: use Slop Evader's pre-2022 cutoff, accepting that you'll also miss legitimate newer content.
4. If you're willing to pay for a structural fix: switch to Kagi, where downranking happens at the engine level and improves as more users flag content.
5. If you want full control and don't mind upkeep: write your own uBlock Origin cosmetic filters on top of a community list.

Most people land on a combination: udm=14 as the default, uBlock Origin running in the background, and a fallback to Kagi or DuckDuckGo's no-AI mode when a search really matters.

Why isn't any single AI-content filter perfect?

Before you install anything, know the tradeoffs.

Browser extensions request page-read permissions to work, which means they can see everything you search. Stick to open-source extensions with public GitHub repos, like the ones above, where you or someone else can actually audit the code.

Blocklists and AI detectors are also imperfect by nature. Graphite's own research shows some AI-generated content still ranks on page one of Google, meaning a 14% AI-generated slice makes it through even the search engine's own ranking signals. If AI detection at the ranking level misses content, a browser-side filter built on the same underlying detection methods will too. If you want to understand how that detection actually works under the hood rather than just trust a blocklist, this breakdown of open-source AI detection tools is a reasonable next stop.

The honest framing: no single tool here gets you to zero AI content. Layering udm=14, a maintained blocklist, and a filtered search engine gets you close enough that the noise stops being the main thing you notice.