Which Browser Does Facebook Use? The In-App Browser Explained (2026)

Which browser does Facebook use? It depends on where you open it. On a computer, Facebook runs in whatever browser you choose, and Meta recommends an up-to-date Chrome, Firefox, Safari or Edge. Inside the Facebook app on iPhone or Android, links open by default in Meta's own in-app browser, which is built on the phone's system web engine rather than on your default browser app.

That second answer is the one that matters most for advertisers. When someone taps your ad in the Facebook app, your landing page loads in the in-app browser, not in Chrome or Safari. This guide explains what that browser is, how it differs from a normal browser, and how to test and set up landing pages with it in mind.

Which browser does Facebook use on desktop?

On a computer, Facebook does not ship a browser of its own. You open facebook.com in the browser you already use. The Facebook Help Center recommends the latest version of Google Chrome, Mozilla Firefox, Safari or Microsoft Edge, and Meta's business tools list the same four browsers with minimum versions. We cover that list, and which of the four works best for Ads Manager, in our guide to the best browser for Facebook.

Which browser does the Facebook app use?

In the mobile app the answer is different. According to the Meta Business Help Center page "About the in-app browser for Facebook and Instagram", the in-app browser lets people open web links within the Facebook or Instagram app on iOS or Android. When a person sees a business ad in the Facebook app and taps it, the links in the ad open in the in-app browser by default. The same applies to external links in organic posts.

Meta describes the in-app browser as built on "industry-standard technology". In practice, the platform rules decide which engine that is:

• iPhone and iPad. Apple's App Store Review Guidelines (section 2.5.6) require apps that browse the web to use the appropriate WebKit framework, the same engine family behind Safari. Apple has allowed alternative engines under an entitlement in the EU since 2024, but WebKit remains the rule elsewhere.
• Android. Apps display web pages through Android's WebView component. Android's developer documentation states that WebView runs on a Chromium-based engine, the same engine family behind Chrome. It also notes that WebView does not include the features of a full browser, such as navigation controls or an address bar; the app adds its own.

So the in-app browser is not Safari and not Chrome, but it renders pages with the same engine families. Most pages that work in those browsers will render, but the surrounding environment is different.

How the in-app browser differs from your normal browser

For anyone running ads, these differences are the ones to keep in mind:

• Separate storage. The in-app browser keeps its own cookies and browsing data. A visitor who is signed in to your site in Safari or Chrome usually arrives signed out, with an empty cart. The Facebook Help Center page "How to edit Facebook's in-app browser settings" confirms that people can clear their in-app browsing information separately from the rest of the phone.
• Meta's own features around the page. Meta lists features such as saving and sharing, a "More info" panel about the business Page, autofill of details from the person's Facebook profile, warnings about harmful sites, and Meta AI summaries of the page.
• Website information. Meta states it may collect and use website content and visitor activity on websites viewed in the in-app browser to improve advertising and other business products. Site owners who do not want this can add a disallow rule for the crawler named Meta-ExternalAds in robots.txt, as the same help page explains.
• An identifiable user agent. The in-app browser adds its own tokens to the user-agent string; tokens such as FBAN, FBAV and FB_IAB are commonly seen in server logs. Meta does not document these as a stable interface, so treat them as a hint for analytics, not as a guarantee.

Can people open links in their normal browser instead?

Yes. Meta's FAQ on the in-app browser says people can use the menu inside the in-app browser to open a link in the system browser, and that anyone who does not want the in-app features can use Facebook on the web instead of the app. The Facebook app also has browser settings for the in-app browser, available only in the Android and iPhone apps.

As an advertiser you cannot switch this off for your audience. Assume that most mobile clicks from Facebook will land in the in-app browser, and build for that.

Testing landing pages for the Facebook in-app browser

A few habits catch most in-app problems before an ad goes live:

1. Test inside the app, on both platforms. Send the landing page URL to yourself in the Facebook app or open an ad preview on a phone, then tap it. Check once on an iPhone and once on an Android device, because the engines differ.
2. Test signed out. Because storage is separate, test as a first-time visitor: no saved login, no stored cart, no remembered consent banner choice.
3. Check sign-in and payment steps. Flows that open new windows or pop-ups, or that rely on an existing session in the default browser, are the usual weak points. Make sure each step works within a single tab.
4. Confirm your tracking. Verify Pixel events in Events Manager after a test visit from the app, not only from a desktop browser. Our Facebook Ads account setup checklist covers the Pixel setup order.
5. Keep the page light. In-app visits are mostly on mobile connections. Heavy pages lose visitors before the first screen loads, whatever the browser.

One rule on user-agent detection

Detecting the in-app browser is legitimate when you use it to fix layout, measure traffic or offer an "open in browser" button. It is not acceptable to use it to show Meta's review systems different content from what users see. Meta's Advertising Standards prohibit techniques designed to get around ad review, and showing reviewers one page and users another is exactly that. No browser or environment setup changes those rules. Our guide to what an anti-detect browser for Facebook ads can and cannot do explains where environment tools fit for ad teams and where they do not.

FAQ

Which browser does Facebook use?

On a computer, whichever browser you open it in; Meta recommends an up-to-date Chrome, Firefox, Safari or Edge. In the Facebook app, links open by default in Meta's in-app browser.

What browser engine does the Facebook in-app browser use?

On iPhone, Apple's guideline 2.5.6 requires WebKit outside the EU exceptions. On Android, apps show web pages through WebView, which Android's documentation describes as Chromium-based.

How do I make Facebook open links in Chrome or Safari?

Open the menu inside the in-app browser and choose to open the link in your system browser, as Meta's help page describes. You can also use Facebook on the web instead of the app.

Does the in-app browser affect my ads?

It affects the landing page experience. Visitors arrive without the cookies from their usual browser, so test sign-in, checkout and Pixel events inside the app before launching.