What's the best Chrome extension to block adult websites?

For protecting your focus, Focuh is the best free Chrome extension to block adult websites. You add the specific domains you want gone, start a challenge, and blocked tabs redirect to a quiet local page with no account and no telemetry. The honest caveat is that no extension filters an entire category — you're listing sites by hand, only in Chrome. For category-wide or cross-browser coverage you pair it with a filtering DNS service or a system-level tool like the Focuh Mac app.

Can a Chrome extension block all adult websites automatically?

No. A Chrome extension blocks only the exact domains you add, and only inside Chrome. There's no built-in category filter that recognizes thousands of adult sites, and the block stops at Chrome's edge — Safari, Firefox, and any browser without the extension are untouched. For automatic, category-wide blocking you need a filtering DNS service or macOS Screen Time's Limit Adult Websites setting, both of which use maintained lists instead of asking you to type domains one at a time.

Does blocking adult sites in Chrome work in incognito mode?

Only if you turn it on. Chrome disables extensions in incognito windows by default, so a blocked adult site opens normally in a private window unless you've explicitly allowed the extension there. Go to chrome://extensions, open the blocker's details, and enable Allow in Incognito. Even then the block only covers Chrome's incognito — a private window in another browser, or any browser without the extension installed, sails straight past it.

Is there a free Chrome extension to block adult content?

Yes. Focuh is free with no account, no cap on how many domains you block, and no telemetry, so your list stays on your device. That privacy matters more than usual for a sensitive blocklist. Some freemium blockers cap the free tier at a handful of sites or require an account that syncs your list to their servers, so read the privacy policy before trusting any extension with this kind of list.

How do I block adult websites across every browser, not just Chrome?

Move the block below the browser. A filtering DNS service applies to every browser and app on the device at once and uses a category list, so you aren't typing domains by hand. On a Mac, Screen Time's Limit Adult Websites covers Safari and applies system-wide, and the free Focuh Mac app blocks the sites you list across Chrome, Safari, Firefox, and Arc during a focus session. A Chrome extension, by design, can never reach a browser it isn't installed in.

Can adult-site blocks in Chrome be bypassed?

Yes, to different degrees. A Chrome extension disables from chrome://extensions in seconds, which is the weakest layer. A filtering DNS can be changed in network settings unless it's locked down. Screen Time lifts with its passcode. SelfControl is effectively irreversible until its timer ends. There's no unbreakable lock on your own machine — the realistic goal is enough friction to interrupt an impulse, ideally layered so no single switch reopens everything at once.

Is a focus blocker the same as a porn filter?

Not quite. A focus extension like Focuh blocks the specific domains you add, mainly to protect your attention during work. A dedicated porn or content filter blocks an entire category automatically using a maintained list of thousands of sites, usually at the DNS or system level. If you want to break a focus-time habit, a blocker is enough. If you want category-wide filtering for recovery or accountability, use a dedicated filter and layer a focus tool on top.

Will the extension keep my blocklist private?

With the right tool, yes. Focuh stores your blocklist in local Chrome storage and sends nothing to a server — no account, no telemetry — so the adult sites you add never leave your device. That's the standard you want for a list this sensitive. Avoid blockers that require an account and sync your list to their servers, since that puts a record of what you're trying to avoid on someone else's infrastructure.

Chrome extensionblock adult websiteswebsite blockerfreefocus

Best Chrome Extension to Block Adult Websites (2026)

June 29, 202610 min readFocuh

If you want adult websites out of your day — to protect your focus, break a habit, or stop the autopilot tab-opening — a Chrome extension is the fastest place to start and the easiest to overrate. This guide covers the best Chrome extension to block adult websites in 2026, how to set it up in about a minute, and exactly where an extension stops short so you know what to layer on top.

The short answer

The best free Chrome extension to block adult websites is Focuh: you add the domains you want gone, start a challenge, and blocked tabs redirect to a plain local page with no preview. No account, no telemetry, no cap on how many sites you list. Set it up in under a minute. The caveat worth stating up front — an extension blocks only the sites you list, only in Chrome — is the whole reason the rest of this guide exists.

What makes a Chrome extension good for this?

Most blockers handle ordinary distraction fine. Adult-content blocking has stricter requirements, and three things actually matter.

It keeps your list private. A blocklist of adult sites is sensitive. You want it stored locally, not synced to a company's servers behind an account. Focuh keeps the list in local Chrome storage and ships no telemetry.

It doesn't cap you. Some "free" blockers stop you at three or five sites. You'll blow past that immediately here, so an unlimited list isn't a luxury — it's the baseline.

It's honest about incognito. The habit you're fighting tends to hide in private windows. A good blocker tells you plainly that Chrome disables extensions in incognito by default and shows you how to turn the block on there.

Best Chrome extensions to block adult websites, compared

Extension	Free?	Site limit	Account	List stays private	Best for
Focuh	Yes	Unlimited	None	Yes (local only)	Protecting focus, private blocklist
BlockSite	Trial	3 sites	Required	Synced to server	Trying before paying
LeechBlock NG	Yes	Unlimited	None	Yes (local)	Power users who want regex rules
StayFocusd	Yes	Unlimited	None	Yes (local)	Daily time budgets, legacy users

The column that should decide it for a list like this is the second-to-last one. A blocker that syncs your adult-site list to a server behind an account is recording exactly what you're trying to avoid. If you only ever block two or three sites, BlockSite's free tier technically works — but the 3-site cap and the account requirement make it a poor fit for category-style blocking. For the wider free landscape, see our best free website blocker for Chrome guide.

What is Focuh?

Focuh is a free Chrome extension that blocks distracting websites during a self-imposed challenge of any length — 30, 91, or 180 days, or a custom number. Add the adult domains you want gone, start the challenge, and every blocked tab redirects to a quiet local page. There's no account, no signup, no telemetry, no ads, and no cap on how many domains you block. Your list lives in local Chrome storage and never leaves the device.

It's built by the same team that ships the free Focuh Mac app, and the two are designed to work together: the extension handles Chrome tabs, the Mac app handles system-wide blocking when you need it stricter.

Strengths

Truly unlimited sites on the free (and only) tier
No account, no telemetry — the blocklist stays on your device
Blocked tabs redirect to a plain page with no preview
Free Mac app available for cross-browser, OS-level blocking

Limitations

No category filter — you list domains by hand, which is whack-a-mole against thousands of adult sites
Blocks Chrome only; Safari, Firefox, and other browsers are untouched
Like any extension, it disables from chrome://extensions in two clicks

Install Focuh

How to block adult websites in Chrome step by step

Open the Chrome Web Store and search for Focuh, or go to the Focuh extension page.
Click Add to Chrome, then Add extension. No account, no email.
Click the Focuh icon and add each adult domain you want blocked.
Pick a challenge length — 30, 91, or 180 days, or a custom number — and start it.
In chrome://extensions, open Focuh's details and turn on Allow in Incognito so the block applies to private windows too.

That last step is the one people skip and regret. Without it, a blocked site opens normally in incognito — which is exactly where this kind of habit tends to live.

Be honest: an extension is the weakest layer here

A focus extension is built to interrupt a reflex during work, not to be an unbreakable content filter. For adult-content blocking specifically it has three real holes, and pretending otherwise sets you up to fail:

It only blocks what you list. No category filter, so you're typing domains one at a time against a category with thousands of sites.
It only blocks Chrome. Open Safari, Firefox, or any browser without the extension and the block is gone.
It disables in two clicks. Anyone — including you at a weak moment — can switch it off from chrome://extensions.

If your goal is protecting attention during focus blocks, the extension does that job well. If your goal is recovery or genuine accountability, you need something sturdier, and you should know that before you lean on the wrong tool.

What works better than an extension?

A filtering DNS service. This points your device or router at a DNS that refuses to resolve adult domains. It covers every browser and app at once and uses a maintained category list, so you're not curating domains by hand. Several services have free tiers, and it's the single biggest upgrade over a browser extension.

macOS Screen Time. Free and built into every Mac, Screen Time has a Limit Adult Websites option under Content & Privacy Restrictions → Content Restrictions → Web Content. It applies system-wide, covers Safari, and supports Always Allowed and Never Allowed lists. Set a Screen Time passcode you won't guess in a weak moment.

The Focuh Mac app. For blocking tied to focus sessions rather than an always-on filter, the free Focuh Mac app blocks the sites you list across Chrome, Safari, Firefox, and Arc at the OS level using Accessibility APIs. It's better at protecting work time than at category filtering, so it pairs with a DNS filter rather than replacing one. For the full walkthrough, see how to block adult websites on Mac.

Why system-level beats browser-level

The pattern across every option above is simple: the tools that filter a whole category or cover every browser all work below the browser. An extension is fast and private, but it's the top layer, not the foundation. A determined user — or you, mid-afternoon — disables a single-browser extension in seconds, while a DNS filter or a system-level app takes real effort to route around. The full breakdown is in system-level vs browser website blocking.

The most reliable setup layers them so no single switch reopens everything: a category-level filter (DNS or Screen Time) underneath a focus tool like the Focuh extension or Mac app. Disable one and the other still holds.

Which option should you pick?

You want to protect focus time and keep your list private — the Focuh extension, with Allow in Incognito turned on.
You want category-wide filtering across every browser — a filtering DNS service, layered under a focus tool.
You're on a Mac and want a free built-in filter — Screen Time's Limit Adult Websites, with a passcode set.
You want it on your whole Mac, not just Chrome — the free Focuh Mac app.

A Chrome extension is a fine first step and a poor last line of defense. Be clear about which job you're asking it to do. Install Focuh free to protect your focus, and add a category-level filter and the free Mac app when you need the block to hold beyond a single browser.