The simplest way depends on what you're trying to stop

Blocking a website on your phone means preventing it from loading when you try to visit it — either by accident, habit, or because you want to protect someone else's access. The method you use depends on whether you want to block it just for yourself, block it across all apps, or set up parental controls for another person's device.

On most phones, you have three main routes: using your phone's built-in content filter, changing your network settings to block at the DNS level, or installing a third-party app that acts as a gatekeeper. Each one works differently and offers different levels of control.

Key Takeaways

  • Your phone's built-in parental controls (Screen Time on iPhone, Digital Wellbeing on Android) can block websites through Safari or Chrome without installing anything extra.
  • DNS-level blocking through apps like OpenDNS or Cloudflare's 1.1.1.1 for Families blocks a site across all apps and browsers, but requires changing your network settings.
  • Browser-based blocking through extensions or settings only works within that specific browser — Chrome, Safari, or Firefox each have their own tools.
  • Blocking a website on someone else's phone requires setting up a separate account with parental controls enabled, not just blocking it on your own account.

Using your phone's built-in content filter

Both iPhone and Android have native tools that let you block websites without downloading anything. On iPhone, this is called Screen Time. Go to Settings > Screen Time > Content & Privacy Restrictions, turn on Content & Privacy Restrictions, then tap Allowed Apps. From there you can restrict Safari or specific apps. Then go to Content Restrictions > Web Content and choose Limit Adult Websites, or add specific sites to the Never Allow list.

On Android, the tool is called Digital Wellbeing. Open Settings > Digital Wellbeing & parental controls, tap the app or website you want to restrict, and set time limits or block it entirely. You can also use the Focus mode (on newer Android phones) to pause apps and websites during certain times.

The limitation of both methods is that they only block the default browser. If someone switches to a different browser app, the block may not explore. They also require you to set a PIN or password so the blocked person cannot straightforward turn off the restriction.

Blocking at the network level with DNS filtering

A more thorough approach is to block websites at the DNS level — the system that translates website names into addresses your phone can reach. When you change your DNS settings, you're telling your phone to use a different service that filters out blocked sites before they even try to load.

Cloudflare's 1.1.1.1 for Families is free and straightforward. read the 1.1.1.1 app from your phone's app store, open it, and toggle on Malware and Adult Content blocking. This blocks sites across all browsers and apps on your phone. OpenDNS (owned by Cisco) offers similar filtering but requires more setup — you create an account, configure which categories to block, then manually change your phone's DNS settings to point to OpenDNS servers.

DNS blocking is harder to bypass than browser-based blocking because it works at a lower level of your phone's network stack. However, someone with technical knowledge can still work around it by using a VPN or changing the DNS settings back. It also blocks sites for all users on that network connection, not just one person.

Blocking websites within a specific browser

If you only want to block a site in Chrome, Safari, or Firefox, you can use browser-specific tools. In Chrome on Android, you can install extensions like BlockSite or LeechBlock NG from the Chrome Web Store. Open the extension, add the URL you want to block, and it will prevent that site from loading when you try to visit it in Chrome only.

Safari on iPhone does not support extensions the same way, but you can use the built-in Restrictions feature mentioned above, or use a third-party app like Freedom or Cold Turkey that integrates with Safari. Firefox on Android allows extensions as well — install uBlock Origin or similar blocking extensions from the Firefox Add-ons store.

Browser-based blocking is straightforward to set up and straightforward to remove, which makes it useful for your own habits but not reliable for parental controls. Someone can straightforward switch browsers or clear the extension.

Setting up parental controls for another person's phone

If you are setting up blocking for a child or someone else, you need to create a separate account with parental controls enabled, not just block the site on your own account. On iPhone, go to Settings > Family Sharing and add the person as a family member, then set up Screen Time for their account with a PIN only you know. On Android, create a supervised account through Family Link, which gives you a separate app on your phone where you can manage their restrictions remotely.

With Family Link on Android, you can block specific apps and websites, set daily time limits, and see which apps they are using. With Family Sharing on iPhone, you set restrictions on their device itself, so you need physical access to set it up. Both systems require that the child's account is separate from yours — you cannot straightforward enable restrictions on a shared account.

These parental control systems are designed to be harder to bypass than personal blocking tools, but they are not foolproof. A determined teenager with technical knowledge can still find ways around them, such as using a school computer or a friend's phone.

What happens when you block a website

When you block a website, your phone either refuses to load the page or shows an error message saying the site is blocked. The blocked person cannot access that site through the method you used — but they may be able to access it through a different method. For example, if you block a site in Chrome, they can open Safari. If you block it at the DNS level, they can use a VPN to bypass the DNS filter.

Blocking is not the same as deleting. The website still exists on the internet; your phone is just refusing to connect to it. If you remove the block later, the site will load normally again.

Choosing the right blocking method for your situation

If you are blocking a site for yourself to break a habit, browser-based blocking or your phone's built-in focus tools are usually enough. If you want to block a site across all apps on your own phone, DNS filtering is more thorough. If you are setting up controls for a child or someone else, use your phone's parental control system (Screen Time or Family Link) because it is designed to be harder to bypass and gives you remote management options.

Consider also what you are trying to prevent. If the goal is to reduce distraction, time limits and focus modes may work better than outright blocking. If the goal is to prevent access to harmful content, DNS-level blocking or parental controls are more effective. If the goal is to make a site inconvenient to reach so you think twice before visiting, browser-based blocking is often enough.

Frequently Asked Questions

Can someone unblock a website I blocked on their phone?

It depends on the method. If you set up parental controls with a PIN or password only you know, they cannot unblock it without that PIN. If you just installed a browser extension or used a focus mode, they can usually remove it if they have access to the phone's settings. DNS-level blocking is harder to bypass but still possible with a VPN.

Will blocking a website on my phone block it on my computer too?

No. Blocking is device-specific unless you use a service that syncs across devices. If you want to block a site on both your phone and computer, you need to set it up separately on each device, or use a service like Freedom or Cold Turkey that works across multiple devices.

What if I block a website by mistake?

You can unblock it by going back to the same settings where you blocked it. In Screen Time, go to Content Restrictions > Web Content and remove it from the Never Allow list. In Digital Wellbeing, tap the app or site and remove the restriction. In a browser extension, open the extension and delete the blocked URL.

Does blocking a website use more data or battery?

No. Blocking a website actually saves a small amount of data and battery because your phone does not have to load the page. The blocking happens before the page request is sent, so there is no extra processing involved.

Can I block a website only during certain hours?

Yes, if you use your phone's built-in focus modes or parental controls. Screen Time on iPhone and Digital Wellbeing on Android both let you set schedules for when restrictions are active. You can also use apps like Freedom that let you schedule blocking for specific times of day.