How do I block a website permanently on my Mac?

There's no true 'permanent' block, since anything you set up you can also remove — but you can make a block durable and hard to undo. The most reliable free routes are editing the /etc/hosts file so the domain stays blocked until you delete the line, and running the free Focuh app's long challenges that block across every browser for weeks or months. Pair either with a Screen Time passcode to add friction to undoing it.

Can you actually block a website permanently, or just temporarily?

Strictly, every block is reversible, because you hold admin rights on your own Mac and can always edit the file or quit the app. 'Permanent' in practice means high enough friction that you won't undo it casually. A hosts-file entry stays until you remove it, a locked Screen Time restriction needs a passcode, and a long Focuh challenge runs for months. None are truly unbreakable, but each raises the cost of caving past the point of an impulse.

How do I block a website forever using the hosts file?

Open Terminal, run sudo nano /etc/hosts, and add a line like '127.0.0.1 example.com' plus one for 'www.example.com'. Save with Control+O, exit with Control+X, then flush DNS with sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder. The domain stays blocked in every browser until you reopen the file and delete those lines. It's the closest free thing to a set-and-forget block, though it has no timer and you can edit it out anytime.

Does blocking a website permanently work across all browsers?

It depends on the method. The hosts file and a system-level app like Focuh block below the browser, so the site is unreachable in Safari, Chrome, Firefox, and Arc at once. Screen Time only governs Safari, so a 'permanent' Screen Time block still leaves the site open in Chrome. For a durable block that holds everywhere, use an OS-level method rather than a single-browser one, or the other browsers become an easy escape.

How do I make a blocked website hard to unblock on Mac?

Stack friction. Set a Screen Time passcode you don't have memorized so lifting a restriction takes effort. Use the hosts file so undoing the block means a Terminal session, not a toggle. Run a long Focuh challenge that's tied to a focus session and uses macOS Accessibility APIs, which resists a quick disable. The goal isn't an unbreakable wall — it's enough steps that you talk yourself out of the bypass before you finish it.

Is a permanent block a good idea, or should I use a long challenge instead?

For most people a long, definite challenge beats a true 'forever' block. A fixed stretch — 90 or 180 days — is long enough to break the habit but has an end you can see, which makes it easier to commit to and less likely you'll rip it out in frustration. After it ends, many people find the reflex is gone and never re-add the site. If it comes back, you start another challenge rather than living under a permanent rule.

Will a permanent website block survive a Mac restart?

The hosts file does — it's a system file that loads on every boot, so the block persists across restarts and logouts until you remove it. Screen Time restrictions also survive restarts. A focus app's block applies while a session is running; a long Focuh challenge persists across restarts for the challenge duration. So yes, a properly set hosts-file or challenge-based block stays in place after you reboot, unlike a browser tab you just closed.

Can I block adult or specific sites permanently for accountability?

Yes. The hosts file and a locked Screen Time restriction both hold across reboots and every browser when set at the OS level, which suits accountability use. For stronger friction, the free Focuh app runs long challenges that block across all browsers and resist a mid-session undo. For genuine accountability you can also hand the Screen Time passcode to someone else, so unblocking requires asking them rather than a private two-click change.

macOSblock websites permanentlysystem-level blockingwebsite blockerfocus

How to Block Websites Permanently on Mac (Free, 2026)

June 7, 202610 min readFocuh

People search for how to block a website "permanently" when they're tired of blocking the same site over and over and watching it creep back. The honest answer up front: on your own Mac, nothing is truly permanent — you hold admin rights, so any block you set you can also remove. What you can build is a block durable enough and high-friction enough that you won't undo it on a whim. This guide shows you how to block websites permanently on Mac for free, using the methods that come closest.

We'll cover what "permanent" realistically means, then the three most durable free routes: the hosts file, locked Screen Time, and a system-level app with long challenges.

What "permanent" really means on a Mac

A block isn't a lock you can't pick — it's friction. Since you're the administrator of your own machine, the question isn't "can I make this impossible to undo?" (you can't) but "can I make undoing it cost more than the impulse is worth?" That's an achievable goal, and it's the right one.

Three things make a block feel permanent in practice:

It survives restarts and logouts — it's not just a closed tab.
It covers every browser, so there's no easy escape hatch.
Undoing it takes real steps, not a single toggle you'll flip without thinking.

Each method below hits some of these. Stacking them is how you get close to "permanent."

Method 1: The hosts file (closest to set-and-forget)

The hosts file is the nearest free thing to a permanent block. It's a system file that loads on every boot and works below the browser, so the block persists across restarts and applies in every browser at once.

Open Terminal and run:

sudo nano /etc/hosts

Add a line for the domain and its common subdomains:

127.0.0.1 example.com
127.0.0.1 www.example.com
127.0.0.1 m.example.com

Save with Control+O, exit with Control+X, then flush DNS:

sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder

The site stays blocked — through restarts, in every browser — until you reopen the file and delete those lines. That's its strength and its limit: it's durable and universal, but it has no timer, and removing it takes about thirty seconds if you decide to cave. For accountability, that thirty seconds is more friction than a toggle but less than a locked app. The deeper mechanics are in system-level website blocking on macOS.

Method 2: Locked Screen Time (passcode friction)

Screen Time can block a site in Safari and lock the restriction behind a passcode, which adds the friction the hosts file lacks.

Open System Settings → Screen Time → Content & Privacy.
Turn on Content & Privacy Restrictions.
Under Content Restrictions → Access to Web Content, choose Limit Adult Websites, click Customize, and add the site under Restricted.
Set a Screen Time passcode separate from your login password.

If you genuinely want it to be hard to undo, have someone else set the passcode — then lifting the restriction means asking them, which is real accountability rather than a private change of mind. The catch: Screen Time only governs Safari, so a determined version of you just opens Chrome. It's durable but single-browser, so on its own it isn't a "permanent" block across the machine.

Method 3: A system-level app with long challenges

The hosts file is durable but frictionless to undo; Screen Time is locked but Safari-only. A system-level focus app aims at both: all-browser coverage with friction built in.

The free Focuh desktop app for Mac blocks sites across every browser at the operating-system level and runs challenges as long as you want — 91 days, 180 days, or a custom span. While a challenge runs, the blocked sites are unreachable in Safari, Chrome, Firefox, and Arc together, and because the app uses macOS Accessibility APIs and ties blocking to a session, it resists a quick mid-session disable. The block persists across restarts for the length of the challenge.

This is the closest a free tool gets to "permanent" in the way people actually mean it: long, all-browser, and annoying to switch off in a weak moment. For where it sits among other tools, see the best free app blocker for Mac in 2026.

Ways to block websites permanently on Mac, compared

Method	Free?	Survives restart?	All browsers?	Undo friction
Hosts file	Yes	Yes	Yes	Low–medium (Terminal edit)
Locked Screen Time	Yes	Yes	No (Safari only)	Medium (passcode)
Focuh long challenge	Yes	Yes (for the challenge)	Yes (OS-level)	High
Closing the tab	Yes	No	No	None

The bottom row is there as the baseline most people are actually doing and calling "blocking." Anything above it survives a reboot and holds across more than the current tab — which is the real difference between a permanent block and a temporary one. For the full method walkthrough across every browser, see how to block websites across all browsers on Mac.

Why a long challenge usually beats a "forever" block

Reaching for "permanent" is often a sign the earlier blocks were too easy to undo, not that you need a literal forever rule. A fixed, long challenge tends to work better than an open-ended one. A 90- or 180-day stretch is long enough to break the habit — habit change commonly takes a couple of months — but it has a visible end, which makes it easier to commit to and far less likely you'll tear it out in frustration halfway through.

When the challenge ends, most people find the reflex is simply gone and never re-add the site. If it comes back, you start another challenge. That's a healthier loop than living under a permanent rule you resent and eventually delete in one angry minute. "Permanent" is the feeling you want; a long, definite block is usually the better way to get it.

Which method should you choose?

"I want it gone and don't want to think about it again" — Use the hosts file. It survives restarts and covers every browser, with the caveat that you can edit it out in thirty seconds.

"I need real accountability" — Use locked Screen Time with a passcode someone else holds, and pair it with an all-browser method so Chrome isn't an escape.

"I keep going back no matter what I try" — Run a long Focuh challenge. The free Focuh app blocks across every browser for months and is hard to switch off mid-session.

Nothing on a Mac you administer is truly unbreakable, and that's fine — the goal is enough friction that the impulse loses before you finish undoing the block. Stack a durable method with a passcode and a long challenge, and you'll get as close to permanent as a free setup allows. Download the free Focuh app to start a long, all-browser block today.