Deep Linking

Deep linking is the practice of using a hyperlink that sends a user directly to a specific, indexed piece of content — a particular page, product, screen, or feature — rather than dropping them on a generic homepage or app landing screen. On the web, that means linking to example.com/checkout instead of example.com. Inside a mobile app, it means routing someone straight to the product they tapped on in an email, not the app’s main feed.

The core idea hasn’t changed since the term entered common use in the early 2000s: eliminate unnecessary navigation steps between the click and the destination. What has changed is where deep links point, how they’re built, and what happens when the app isn’t installed yet.

For Android app destinations, Android’s deep-link documentation explains intent routing and verified App Links. A link to a specific web product page and a link that opens a mobile app require different implementation checks.

How Does Deep Linking Work?

At a technical level, a deep link is a URL that the operating system or browser knows how to resolve to a specific destination rather than a default entry point.

Web Deep Linking

On the open web, deep linking is native to how URLs work. A standard web link like https://store.com/products/red-shoes is already a deep link — it points to a specific resource, not the domain root. Every e-commerce product page, every blog post, and every documentation article reached via a direct URL is an example of web deep linking in action.

The distinction only becomes meaningful in contexts where the default behavior would otherwise send users to a homepage: think of an affiliate link that goes straight to a product detail page instead of the merchant’s front door, or a password-reset email that lands on the reset form, not the login screen.

Mobile App Deep Linking

Mobile deep linking is more complex because apps don’t share a universal addressing scheme the way websites share HTTP. Instead, each mobile platform provides its own mechanism:

• iOS uses Universal Links (introduced in iOS 9). These are standard https:// URLs that Apple’s operating system intercepts. When a user taps a Universal Link, iOS checks whether the corresponding app is installed. If it is, the app opens to the relevant screen. If not, the URL opens in Safari as a normal web page.
• Android uses App Links (available since Android 6.0). Similar in concept to Universal Links, App Links are verified https:// URLs. Android confirms that the website owner has authorized the app to handle those links, then routes them directly into the app without showing a disambiguation dialog. As of Android 15, Google introduced Dynamic App Links, which let developers adjust link-matching behavior without shipping a new app version.

Launch your affiliate program today

Set up advanced tracking in minutes. No credit card required.

Request demo Start 30-days free trial

Types of Deep Links

Traditional Deep Linking

This is the simplest form: a link that opens a specific screen in an already-installed app. If the app isn’t present, the link either fails or redirects to a generic web fallback. Traditional deep links work well for push notification campaigns and re-engagement emails sent to known active users.

Deferred Deep Linking

Deferred deep linking solves the “app not installed” problem. When a user taps the link, the system checks for the app. If it’s missing, the user is sent to the App Store or Google Play. After installation and first launch, the app reads the deferred data and routes the user to the originally intended screen — the product they clicked, the referral reward they earned, or the onboarding flow they were promised.

Contextual Deep Linking

Contextual deep linking extends deferred linking by attaching additional metadata to the link: campaign source, referral codes, user preferences, A/B test variants, or personalization signals. When the app opens, it reads this context and tailors the experience — showing a personalized welcome message, crediting the right referral partner, or applying a specific promotion code automatically.

Why Deep Linking Matters: Conversion, Retention, and Attribution

Deep linking isn’t a cosmetic improvement. It changes the economics of every click-driven campaign.

Higher Conversion Rates

Every extra tap between a user’s click and their destination loses a portion of the audience. Industry data from mobile measurement platforms consistently shows that deep-linked campaigns convert at 3–5× the rate of campaigns that land users on a homepage. Pinterest reported that deep-linked signup flows completed at double the rate of generic landing-page flows. Spotify found that playlist sharing via deep links converted 4× better than home-screen redirects.

The reason is straightforward: a user who clicks on a specific pair of shoes wants to see those shoes, not the store’s seasonal collection. Deep linking honors that intent.

Improved Retention and Re-engagement

Deep links power the re-engagement loop. A push notification about an abandoned cart that opens directly to that cart — rather than the app’s home tab — removes the cognitive load of re-navigating. The same principle applies to win-back emails, SMS campaigns, and social media retargeting ads.

Accurate Campaign Attribution

When a deep link carries campaign parameters, marketers can trace exactly which channel, creative, and message drove a given install or purchase. This closes the loop between click and conversion in a way that generic homepage links cannot. Platforms like AppsFlyer, Branch, and Adjust build their attribution models on top of deep linking infrastructure precisely because the link itself becomes the measurement vehicle.

Join our newsletter

Be the first to know about new features and product updates.

Email address

Subscribe

Deep Linking in Affiliate Marketing

Affiliate marketing depends on sending traffic to specific products, offers, or landing pages. Deep linking is what makes that possible at scale.

How Affiliates Use Deep Links

An affiliate promoting a merchant’s product doesn’t want to send their audience to the merchant’s homepage and hope they find the right item. They use a deep link — often generated through an affiliate platform or network — that points directly to the product detail page, with the affiliate’s tracking ID embedded in the URL.

The workflow looks like this:

1. An affiliate selects a product from a merchant’s catalog inside their affiliate dashboard.
2. The platform generates a deep link that combines the product URL with the affiliate’s unique identifier.
3. The affiliate places that link in a blog post, email, social media post, or video description.
4. When a visitor clicks, they land on the exact product page. If they purchase, the affiliate platform records the conversion and attributes it correctly.

Without deep linking, the affiliate would need to instruct visitors to search for the product manually — a leaky handoff that kills conversion rates.

What Affiliate Program Managers Should Know

For merchants running affiliate programs, deep link support is a competitive requirement. Affiliates will prioritize programs that let them link to specific products over those that force generic homepage redirects.

Key considerations for program managers:

• Keep product URLs stable. Changing URL structures breaks existing deep links across the affiliate network, causing 404 errors and lost commissions.
• Provide deep linking to non-product pages such as category pages, seasonal collections, and promotional landing pages — not just individual SKUs.
• Track deep link performance separately in your reporting to understand which products and pages drive the most affiliate revenue.

Limitations Affiliates Should Understand

Deep linking is powerful, but it has constraints:

• URL changes break links. If a merchant redesigns their site and changes product URL patterns, every deep link pointing to the old structure stops working. Affiliates should periodically audit their links.
• Some platforms strip tracking parameters. Certain social media apps and email clients rewrite or strip query parameters from URLs, which can break attribution. Using link shorteners or dedicated tracking domains helps mitigate this.
• Mobile web vs. app routing. If a merchant has both a mobile website and an app, a deep link that works perfectly on desktop may open the app store or a broken app screen on mobile, depending on how the merchant has configured their deep linking. Affiliates promoting app-based merchants should test links on both platforms.

Deep Linking and the Post-Firebase Dynamic Links Landscape

FDL had been a popular free solution for deferred deep linking, cross-platform routing, and basic click analytics.

What Replaced Firebase Dynamic Links?

Google now recommends third-party deep linking providers. The main alternatives fall into two categories:

Third-party platforms that combine deferred deep linking, attribution, and fallback handling in one service:

• AppsFlyer OneLink — full deep linking suite with attribution, web-to-app tools, and ESP integrations. Offers a free tier.
• Branch — deep linking with broad ESP support; some advanced features are paid add-ons.
• Adjust — mobile measurement partner with deep linking capabilities.
• Kochava — attribution-focused with deep linking support.

DIY native linking using Universal Links (iOS) and Android App Links. This approach handles basic in-app routing for users who already have the app but lacks deferred deep linking, attribution, and fallback mechanisms. It requires significant engineering effort to maintain across browser and OS fragmentation.

Migration Considerations

Teams still running on FDL should prioritize migration. The key decision is whether the organization needs deferred deep linking and attribution (choose a third-party platform) or only basic in-app routing for existing users (native OS linking may suffice). Most marketing-driven apps need the former.

How to Set Up Deep Links for Your App

iOS: Universal Links

1. Configure your server to serve an apple-app-site-association (AASA) file at /.well-known/apple-app-site-association on your domain. This JSON file lists the paths your app can handle.
2. Update your Xcode project to enable the Associated Domains capability and add your domain.
3. Implement handling in your app delegate or scene delegate to parse the incoming URL and route to the correct screen.
4. Test using the swcutil tool, Safari, or the Messages app — Apple’s validation is strict, and Universal Links silently fail if the AASA file is misconfigured.

Android: App Links

1. Add intent filters to your AndroidManifest.xml that declare which URL patterns your app handles.
2. Host a Digital Asset Links JSON file at /.well-known/assetlinks.json on your domain to verify domain ownership.
3. Enable auto-verification in the intent filter so Android confirms the association without user prompts.
4. Test using adb shell am start commands and the App Links Verification API in Android Studio.

Using a Third-Party Platform

Platforms like AppsFlyer, Branch, and Adjust abstract much of the setup complexity. The typical workflow:

1. Register your app and configure your domain in the platform dashboard.
2. Integrate the platform’s SDK into your app.
3. Define your deep link routing logic — which URL patterns map to which screens.
4. Generate links through the platform’s dashboard or API, with deferred and contextual behavior pre-configured.

The trade-off is cost (most platforms charge beyond a free tier) versus engineering time (DIY linking requires ongoing maintenance).

Common Deep Linking Pitfalls

Broken Links After URL Restructuring

When a website or app changes its content hierarchy, existing deep links break. For web deep links, 301 redirects solve this. For app deep links, the routing logic must be updated in the app itself — which means users on older app versions may still encounter broken links until they update.

The Disambiguation Dialog Problem

On Android, if App Links aren’t properly verified, the system shows a disambiguation dialog asking the user to choose between the browser and the app. This extra step erases the frictionless benefit of deep linking. Proper Digital Asset Links verification eliminates this dialog.

Link Wrapping by Email and Social Platforms

Email service providers and social networks often wrap outbound links for click tracking. Some wrapping methods strip custom URI schemes or modify URL parameters, breaking deep link resolution. Third-party platforms mitigate this with dedicated ESP integrations and link-wrapping-compatible URL structures.

Platform-Specific Behavior Gaps

A deep link that works perfectly on iOS may behave differently on Android, and vice versa. Testing across devices, OS versions, and app-install states (app installed, app not installed, app installed but outdated) is essential before launching any deep-linked campaign.