The fastest way depends on what you're trying to block and whose phone it is

If you want to block websites on your own phone, your phone's built-in settings usually work — no app needed. If you're blocking sites on someone else's phone (a child's device, for example), the method changes depending on whether it's an iPhone or Android, and whether you want to block specific sites or entire categories like adult content.

The simplest route for your own phone is your browser's settings. Safari on iPhone, Chrome on Android, and Firefox on both let you restrict access directly. For more control — blocking sites across all apps and browsers — you'll need your phone's system-level parental controls or a third-party app.

Key Takeaways

  • Your phone's web browser has built-in content filters that block sites within that browser only, without needing additional software.
  • iPhone's Screen Time and Android's Digital Wellbeing both let you block specific websites across all apps on the device.
  • Third-party apps like OpenDNS, Bark, and Net Nanny block websites at the network level, so they work even if someone tries to use a different browser.
  • Blocking sites on a child's phone usually requires setting up parental controls with a PIN or password they cannot change.
  • Some blocks apply only to that device; others (like DNS-level blocking) protect across your home network.

Blocking websites in your browser

Every major browser on iPhone and Android includes a content filter. On Safari (iPhone), go to Settings > Screen Time > Content & Privacy Restrictions > Allowed Apps, then toggle off Safari. Then go back and select Content Restrictions > Web Content > Limit Adult Websites. This blocks adult sites by default but lets you add specific URLs to a blocklist.

On Chrome (Android and iPhone), open Settings > Safety > Safe Browsing, then turn on Enhanced Protection. This blocks known malware and phishing sites but not arbitrary websites you choose. To block specific sites in Chrome, you'll need a third-party extension on desktop, but mobile Chrome doesn't support extensions — you'll need to use your phone's system settings instead.

On Firefox (Android and iPhone), go to Settings > Privacy > Tracking Protection and turn it on. This blocks trackers and some malicious sites, but not custom blocklists. Firefox does not have a built-in feature to block specific websites you choose.

Browser-level blocking only works within that browser. If someone switches to a different browser, the blocks do not follow them. For that reason, browser settings work best if you're blocking sites on your own device and trust yourself not to switch browsers.

Using your phone's system-level parental controls

On iPhone: Go to Settings > Screen Time > Content & Privacy Restrictions (you'll need to set a PIN). Tap Allowed Apps and toggle off Safari, or toggle off specific apps you want to restrict. Then go to Content Restrictions > Web Content and choose Limit Adult Websites, or Allowed Websites Only (which blocks everything except sites you whitelist). You can add specific URLs to block or allow by scrolling to the bottom of that screen.

This method blocks websites across Safari, Chrome, Firefox, and any other browser on the device. The PIN prevents someone from turning off Screen Time without your password. If you forget the PIN, you'll need to reset your phone or contact Apple Support.

On Android: Go to Settings > Digital Wellbeing & Parental Controls > Parental Controls (toggle it on). Create a PIN, then tap App Limits or Bedtime Mode to restrict when apps can be used. For website blocking specifically, Android's built-in tools are limited — you can restrict apps but not individual websites. You'll need a third-party app for that.

Android's parental controls work best paired with a third-party app like Google Family Link, which lets you block apps and set screen time limits from a parent's phone.

Third-party apps that block websites across your network

If you want to block websites on any device connected to your home Wi-Fi — not just one phone — you can use a DNS-level blocker. These apps intercept web requests at your router level, so the blocks apply whether someone uses Safari, Chrome, Firefox, or any other browser.

OpenDNS (free and paid versions) lets you set up filtering rules on your router. You log in to your router's admin panel, change the DNS settings to OpenDNS's servers, and then create a blocklist. This works on any device on your network, including phones, tablets, and computers. The free version blocks malware and phishing; paid versions let you create custom blocklists.

Bark (paid, around $9–15 per month) monitors and blocks websites, apps, and messages on individual devices. You install it on each phone you want to monitor. It blocks adult content, gambling, and other categories by default, and you can add specific sites. Bark also sends alerts if it detects concerning activity.

Net Nanny (paid, around $50–100 per year) blocks websites and apps on individual devices and across your network. It works on iPhone, Android, Mac, and Windows. You can set different rules for different family members and see reports of blocked attempts.

Third-party apps usually require a subscription and ask for permission to monitor network traffic or install a VPN profile on your phone. Read the privacy policy before installing — some apps collect data about your browsing.

Blocking websites when you don't control the phone

If you're trying to block a website on a phone you don't own or manage, your options are limited. You cannot change someone else's system settings without their password or PIN. You can ask them to block the site themselves using the methods above, or you can ask the network owner (like your internet provider or school) to block it at the router level.

Some workplaces and schools use network-level filtering that blocks certain sites for all devices on their network. If you're on a school or work network, contact IT support to request a block.

What happens when a website is blocked

When you try to visit a blocked website, you'll usually see an error message saying the site is blocked or unavailable. On iPhone's Screen Time, the message says "This website is restricted." On Android with a third-party app, the message depends on which app you're using — it might say "This site is blocked by [app name]."

Some blocking apps let you set a PIN to temporarily unblock a site. Others require you to ask a parent or administrator to unblock it. If you block a site by mistake, you can unblock it by going back to the same settings and removing it from the blocklist.

Blocking does not delete the site from the internet or prevent others from visiting it — it only prevents access from your device or network.

Frequently Asked Questions

Can someone bypass a website block on my phone?

If the block is in your browser settings only, yes — they can switch to a different browser. If the block is in your phone's system settings (Screen Time or Digital Wellbeing) and protected by a PIN, they cannot bypass it without the PIN. If the block is at the router level (DNS filtering), they cannot bypass it unless they connect to a different Wi-Fi network or use mobile data with a VPN.

Will blocking a website slow down my phone?

Browser-level blocking has no noticeable effect on speed. System-level blocking and third-party apps may use a small amount of battery and data, but most users do not notice a difference. DNS-level blocking at your router has no effect on individual phone performance.

Can I block websites on my child's phone without them knowing?

Yes, if you set up parental controls with a PIN they do not know. However, they will see the blocked message when they try to visit a site, so they will know something is blocking it. Some apps like Bark send notifications to the parent but not the child, so the child does not see alerts about what was blocked.

What's the difference between blocking and filtering?

Blocking stops access to specific websites you choose. Filtering automatically blocks categories of sites (like adult content or gambling) based on the site's category. Most tools do both — they filter by category by default and let you add specific sites to block or allow.

Do I need an app to block websites, or can I do it with just my phone's settings?

You can block websites using just your phone's built-in settings — Safari on iPhone or Screen Time, and Digital Wellbeing on Android. An app is only necessary if you want to block sites across your entire home network, or if you want more detailed monitoring and reporting than your phone's settings provide.