The simplest way to block ads on iPhone
The fastest way to block ads on iPhone is to use a browser that has ad blocking built in. Safari, which comes with every iPhone, has a feature called Intelligent Tracking Prevention that blocks some ads and trackers automatically — you do not need to install anything or change settings. For more aggressive ad blocking, you can download Firefox or DuckDuckGo from the App Store, both of which let you enable ad blocking directly in the app without installing a separate extension.
If you want to block ads across your entire phone — not just in the browser — you can set up a content filter in Settings under Screen Time. This method blocks ads in apps and websites system-wide, though it requires a few steps to configure and works differently than a browser-based blocker.
The trade-off is simple: browser-based blockers are easier to turn on and off, but they only work in that one app. System-wide filters block more ads but can sometimes slow down your phone slightly or interfere with apps that rely on ad networks to function.
Key Takeaways
- Safari's built-in Intelligent Tracking Prevention blocks many ads and trackers without any setup, though it is less aggressive than dedicated ad blockers.
- Firefox and DuckDuckGo browsers let you enable ad blocking in their settings and work across all websites you visit in those apps.
- A content filter set up through Screen Time blocks ads system-wide on your iPhone, including in apps, but requires manual configuration.
- Ad blockers that claim to work across all apps usually require you to install a VPN profile, which routes your traffic through a third-party server.
Using Safari's built-in ad blocking
Safari blocks many ads and tracking scripts automatically through Intelligent Tracking Prevention. This feature is on by default and requires no setup. Open Safari, visit a website, and you will see fewer ads than you would in a browser without this protection — though some ads still get through because Safari focuses on blocking trackers rather than all ads.
To check what Safari is blocking, open any website, tap the AA icon in the address bar, and scroll down to see "Privacy Report." This shows you how many trackers Safari blocked on that page. You cannot customize which trackers to block — Safari handles it automatically — but you can turn off Intelligent Tracking Prevention entirely if a website does not work properly with it enabled.
Safari's approach is gentler than dedicated ad blockers, which means fewer websites break, but also means more ads slip through. If you want stronger ad blocking, you need a different browser.
Installing Firefox or DuckDuckGo for stronger ad blocking
Both Firefox and DuckDuckGo are free browsers available in the App Store that include built-in ad blocking you can turn on in seconds. Download either one, open the app, go to Settings, and look for "Ad Blocking" or "Privacy." Toggle it on, and the browser will block most ads on every website you visit in that app.
Firefox's ad blocker is called Enhanced Tracking Protection and comes in three levels: Standard (the default), Strict, and Custom. Standard blocks many trackers and some ads. Strict blocks more but may break some websites. You can switch between levels anytime by going to Settings > Privacy.
DuckDuckGo's blocker is simpler — you turn it on or off in Settings > Privacy, and it blocks ads and trackers across the board. DuckDuckGo also does not track your search history, which Safari and Firefox do by default. The downside is that neither Firefox nor DuckDuckGo is as fast as Safari on iPhone, and some websites may load more slowly with ad blocking enabled.
Setting up a system-wide content filter
If you want to block ads in apps and websites at the same time, you can use iPhone's built-in content filter. Go to Settings > Screen Time > Content & Privacy Restrictions > Content Restrictions > Web Content. Choose "Limit Adult Websites," and iPhone will block sites flagged as containing ads or adult content across Safari, apps, and any browser you use.
This method blocks ads system-wide, but it is blunt — you cannot fine-tune which ads get blocked, and some legitimate websites may be filtered out by mistake. The filter also does not distinguish between ads and regular content, so it may block parts of websites you actually want to see.
A second option is to use a DNS filter like Cloudflare's 1.1.1.1 for Families or Quad9. Download the app from the App Store, follow the setup instructions to install a VPN profile, and the filter will block ads across your entire phone. These services are free and do not require a subscription, but they route your internet traffic through their servers, which some people prefer to avoid for privacy reasons.
Why some ad blockers require a VPN profile
Many ad blocking apps claim to work across your entire iPhone without being a browser. Most of these work by installing a VPN profile — a configuration that intercepts your internet traffic and filters it before it reaches you. This is how apps like AdGuard and Blokada function, and it is why they ask permission to "manage your VPN" when you first install them.
The advantage is that a VPN-based blocker works in Safari, Firefox, and all your apps at once. The disadvantage is that your traffic goes through a third-party server, which means the company running the VPN can see what websites you visit. Most reputable ad blockers say they do not log this data, but you are trusting their privacy policy. Additionally, only one VPN profile can be active at a time, so if you use a real VPN for privacy, you cannot use a VPN-based ad blocker simultaneously.
For most people, a browser-based blocker like Firefox or DuckDuckGo is safer and simpler than installing a VPN profile, because you control exactly which app is doing the blocking.
What to expect when you block ads
When you enable ad blocking, websites load faster because your phone does not have to download ad files. Pages also look cleaner without banner ads, pop-ups, and sponsored content. However, some websites may not work properly — login forms may disappear, videos may not play, or the page layout may break. This happens because the website's code relies on ad networks to function, and the ad blocker accidentally removes something important.
If a website breaks, you have two options: turn off ad blocking for that site only, or use a different browser. In Firefox, you can disable Enhanced Tracking Protection for a specific site by tapping the shield icon in the address bar. In DuckDuckGo, you can turn off the blocker temporarily in Settings. In Safari, you cannot disable Intelligent Tracking Prevention per-site, but you can switch to a different browser for that one website.
Some websites also detect ad blockers and ask you to turn them off before you can read the content. There is no way around this without disabling the blocker — the website's code specifically checks for ad blockers and blocks access if one is detected.
Comparing your free options
| Method | How to turn on | Works in all apps | Strength |
|---|---|---|---|
| Safari's Intelligent Tracking Prevention | On by default | No, Safari only | Weak — blocks trackers, not most ads |
| Firefox browser | Settings > Privacy > Enhanced Tracking Protection | No, Firefox only | Strong — blocks most ads in Firefox |
| DuckDuckGo browser | Settings > Privacy > toggle on | No, DuckDuckGo only | Strong — blocks most ads in DuckDuckGo |
| Screen Time content filter | Settings > Screen Time > Content Restrictions > Web Content | Yes | Weak — blocks some ads but also legitimate content |
| DNS filter (Cloudflare, Quad9) | Install app, follow VPN profile setup | Yes | Medium — blocks ads system-wide but routes traffic through third-party server |
Frequently Asked Questions
Can I block ads in YouTube on iPhone?
Not with a free ad blocker. YouTube's ads are served from the same domain as the video itself, so blockers cannot separate them. The only way to remove YouTube ads on iPhone is to pay for YouTube Premium. Some people use Firefox with ad blocking enabled and watch YouTube in the browser instead of the app, which blocks some ads, but not all of them.
Will ad blocking break my banking app or other important apps?
Browser-based blockers like Firefox and DuckDuckGo only affect websites in those browsers, so your banking app will work normally. System-wide filters like DNS blockers can occasionally interfere with apps, but most major apps work fine. If an app stops working after you enable a system-wide filter, you can turn the filter off temporarily or add that app to the filter's whitelist.
Do I need to pay for ad blocking on iPhone?
No. Safari's Intelligent Tracking Prevention is free and on by default. Firefox and DuckDuckGo are free browsers with free ad blocking. DNS filters like Cloudflare 1.1.1.1 for Families are free. You do not need to pay for any of these. Some paid ad blockers exist, but they do not block significantly more ads than the free options.
Is it safe to use a VPN-based ad blocker?
VPN-based ad blockers are safe to use, but they do route your traffic through a third-party server, which means that company can see which websites you visit. Reputable blockers say they do not log this data, but you are trusting their privacy policy. If privacy is a concern, use a browser-based blocker like Firefox instead, which only blocks ads in that one app and does not route your traffic anywhere.
Why do some websites not work with ad blocking on?
Websites sometimes rely on code from ad networks to display content, handle logins, or load videos. When an ad blocker removes that code, the website breaks. This is usually accidental — the website did not design itself to break with ad blockers, but the ad network's code is tangled up with the website's core functions. You can usually fix it by turning off the blocker for that site only.