How do I block adult websites on Chrome for free?

Install a free blocker like Focuh from the Chrome Web Store, add the specific sites you want gone, and start a challenge. It takes under a minute and needs no account. Any blocked tab redirects to a quiet local page. This works for the sites you list in Chrome, but be honest with yourself: an extension is the weakest layer for adult-content blocking because it doesn't cover other browsers, incognito by default, or category-wide filtering.

Can a Chrome extension fully block adult content?

No, and it's important to be clear about that. An extension blocks only the domains you list, only in the browser it's installed in. It can't filter an entire category of thousands of sites, and it doesn't touch Safari, Firefox, or the millions of sites you didn't list. For comprehensive adult-content filtering you need a category-based filter — a filtering DNS service, macOS Screen Time's adult-content limit, or dedicated accountability software.

Does blocking a site in Chrome work in incognito mode?

Only if you allow it. By default, Chrome disables extensions in incognito windows, so a blocked site opens normally in incognito unless you've explicitly turned the extension on there. Go to chrome://extensions, open the blocker's details, and enable Allow in Incognito. Even then, the block stops at Chrome's edge — incognito in another browser, or any browser without the extension, is untouched.

What's better than a Chrome extension for blocking adult sites?

Anything that works below the browser. A filtering DNS service blocks adult domains across every browser and app on the network at once. macOS Screen Time has a built-in Limit Adult Websites setting under Content Restrictions. The Focuh Mac app blocks at the operating-system level during focus sessions. Each of these is harder to route around than a single-browser extension, which a determined user disables in two clicks.

Can adult-site blocks be bypassed?

Most can, to different degrees. A Chrome extension disables from chrome://extensions in seconds. Screen Time can be turned off with its passcode. A filtering DNS can be changed in network settings unless it's locked down. SelfControl is genuinely irreversible until its timer ends. There's no perfect lock — the realistic goal is enough friction to interrupt an impulse, ideally layered so no single switch reopens everything at once.

How do I block adult sites 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 or network. On a Mac, Screen Time's Limit Adult Websites covers Safari and applies system-wide content rules, and the free Focuh app blocks listed sites across Chrome, Safari, Firefox, and Arc during a focus session. A Chrome extension, by design, can never cover browsers it isn't installed in.

Is a website blocker the same as a porn filter?

Not quite. A website blocker like a focus extension blocks the specific domains you add, mainly to protect your attention during work. A porn filter 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 fine. If you want category-wide filtering for recovery or accountability, use a dedicated filter.

Will adding adult sites to a blocker keep them 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 sites you add never leave your device. That matters more than usual for a sensitive list. Some freemium blockers require an account and sync your list to their servers, so check the privacy policy before you trust any blocker with a list like this.

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How to Block Adult Websites on Chrome (Free) — 2026

June 10, 20268 min readFocuh

If you're trying to keep adult websites out of your day — to protect your focus, break a habit, or just stop the autopilot tab-opening — a Chrome extension is the fastest place to start and the easiest to overestimate. This guide shows how to block adult websites on Chrome for free in about a minute, and it's honest about where an extension stops short and what to layer on top when you need the block to actually hold.

The fast answer

To block adult websites on Chrome for free, install Focuh from the Chrome Web Store, add the specific domains you want gone, and start a challenge. Blocked tabs redirect to a quiet local page with no preview, and there's no account or telemetry, so your list stays on your device. The honest caveat up front: an extension blocks only the sites you list, only in Chrome — for category-wide or cross-browser blocking you need a layer below the browser.

How to block adult websites on 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 site 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 if you want the block to apply to private windows too.

That last step matters. Chrome disables extensions in incognito by default, so without it, a blocked site opens normally in a private window — which is exactly where this kind of habit tends to hide.

Be honest: a Chrome extension is the weakest layer for this

Most focus guides oversell extensions. For adult-content blocking specifically, an extension has three real holes, and pretending otherwise sets you up to fail:

It only blocks what you list. There's no category filter. You're typing in domains one at a time against a category with thousands of sites — pure whack-a-mole.
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.

A focus extension is built to interrupt a reflex during work, not to be an unbreakable content filter. If your goal is protecting attention during focus blocks, it does that well. If your goal is recovery or genuine accountability, you need something sturdier — and you should know that before you rely on the wrong tool.

Free ways to block adult sites, compared

Method	Free?	Category filter	All browsers	Hard to bypass	Setup time
Focuh extension	Yes	No (your list)	No	No	~1 min
Filtering DNS	Yes (free tiers)	Yes	Yes	Medium	~10 min
Screen Time (Mac)	Yes	Yes (built-in)	System-wide	Medium	~5 min
Focuh Mac app	Yes	No (your list)	Yes	Medium	~3 min
SelfControl	Yes	No (your list)	Yes	High	~5 min

The pattern is clear: 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. For why that distinction matters, see system-level vs browser website blocking.

What works better than an extension?

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

macOS Screen Time. Built into every Mac and free, Screen Time has a Limit Adult Websites option under Content & Privacy Restrictions → Content Restrictions → Web Content. It applies system-wide, covers Safari, and lets you add Always Allowed and Never Allowed lists. It can be turned off with the Screen Time passcode, so set one and don't reuse a code you'll 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 well with a DNS filter rather than replacing one.

How do I make the block harder to bypass?

Layer it, and add friction at the point of failure. A single switch that reopens everything is the design flaw in most setups. Stack a category-level filter (DNS or Screen Time) underneath a focus tool, so disabling one doesn't reopen the whole category. On a Mac, the full cross-browser walkthrough is in how to block websites across all browsers on Mac, and for blocks meant to last there's how to block websites permanently on Mac.

If you want a block you genuinely can't argue your way out of for a set period, SelfControl is free, open source, and irreversible until its timer ends. Pair it with a category filter for the domains you'd never think to list.

Which option should you pick?

You want to protect focus time and keep your list private — the Focuh extension plus Allow in Incognito.
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 and the block adult websites on Mac guide.

A Chrome extension is a fine first step and a poor last line of defense. Be clear-eyed 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.