Quick answer: Open Settings → Screen Time → Content & Privacy Restrictions → App Store, Media, Web & Games → Web Content, then choose Limit Adult Websites. This is built into iPhone, so you do not need to install an app. Add known problem domains under Never Allow, set a separate Screen Time passcode, and test every browser you keep.
You can block many porn and adult websites on an iPhone without downloading a separate blocker. Apple includes a web-content filter inside Screen Time. It is a practical free starting point when your priority is avoiding another app or account.
The setting is a filter, not a guarantee. It can miss newly created or unclassified sites, and it does not remove every explicit image or post inside an otherwise allowed app. A good setup combines the built-in filter with testing and a few deliberate choices about browsers and passcodes.
Turn on Limit Adult Websites on iPhone
- Open the Settings app.
- Tap Screen Time.
- Open Content & Privacy Restrictions and turn it on.
- Tap App Store, Media, Web & Games.
- Tap Web Content.
- Select Limit Adult Websites.
The labels can move slightly between iOS releases, but the control remains under Screen Time’s content restrictions. If Screen Time is not enabled yet, iPhone may ask you to turn it on before these options appear.
Add specific websites to Never Allow
Apple’s general filter relies on website classification. If you already know the domains that create a problem for you, add them manually instead of waiting to see whether the automatic filter catches them.
- Stay on the Web Content screen with Limit Adult Websites selected.
- Under Never Allow, tap Add Website.
- Enter the website address and save it.
- Repeat for alternate domains you know you use.
Manual entries are most useful for specific gaps. They do not turn Screen Time into a complete category filter for content inside social networks, messaging apps, or search results served from otherwise allowed domains.
Make the setting harder to switch off
A filter adds little friction if you can disable it automatically in the same moment. Use a Screen Time passcode that is different from the passcode used to unlock your iPhone. Avoid a number you already use elsewhere.
If it suits your situation, ask a trusted person to choose and retain the Screen Time passcode. That is optional, but it creates a stronger separation between an immediate impulse and changing the restriction. Keep account-recovery details current so the setup does not create an unintended lockout.
Test the filter in every browser you keep
Do not stop after the setting is enabled. Check Safari and every other installed browser using both Wi-Fi and cellular data. Confirm that known adult sites are restricted and that ordinary websites still load. Also check private-browsing routes available on your iPhone.
If one browser creates a repeat gap, update iOS and the browser, retest, and consider removing browsers you keep only as a workaround. Recheck the setup after major iOS updates because menus and app behavior can change.
What iPhone’s no-app filter does not cover
- It may not identify every adult domain or newly published page.
- It does not reliably remove explicit posts inside every allowed app or platform.
- It cannot protect another phone, computer, or account you have not configured.
- It remains changeable by anyone who knows the Screen Time passcode.
- It should not be treated as a promise that adult content is impossible to reach.
These are normal limits of website filtering. Test the routes that matter in your own setup instead of relying on an absolute “permanent” or “unbreakable” claim.
When a focused iPhone blocker may fit better
Stay with Screen Time if you want a built-in, no-download option and its basic filtering is enough. Consider a focused blocker if you want one place built around adult website blocking, protection across iPhone browsers, and a visible record of the progress you are trying to protect.
Nohub for iPhone is free to download in the US App Store, which lists it as Free · In-App Purchases. It requires no subscription or account, and progress stays on your device. If you want alternatives that also avoid Screen Time, compare device-level blockers, filtered DNS, Safari extensions, and router controls.
Want a focused blocker instead of Screen Time?
Nohub blocks adult websites across iPhone browsers and tracks progress privately on your device. No subscription or account is required.
View Nohub on the App Store