Deep Link
Definition
A deep link is an address that takes someone straight to a specific piece of content instead of a home page. On the web this is ordinary behaviour: a path like /docs/2025/plan.pdf is a deep link and the site root is not. The phrase picked up a second meaning on mobile, where a link can open a native app at a particular screen rather than the browser, using either a custom scheme or a verified https address the operating system routes to the app. Fragments extend the idea inside a document, so a deep link can land on a section or on page forty of a PDF. The common thread is precision: one address, one destination, no navigation asked of the reader.
Why It Matters
Every click you remove is a reader you keep. Sending someone to a home page and telling them to find the third item under Resources loses a share of them at each step, and for a proposal or a portfolio that share is the entire point of sending it. Deep links also make analytics mean something, because a visit to a specific address tells you what was actually read, while home-page traffic tells you almost nothing. The trade-off is fragility: the more specific the address, the more ways it can break, which is the argument for building deep links on an address you control rather than on a path through somebody else's navigation.
How It Works
On the web the host maps the path to a file and returns it, so the depth of a link is simply how many segments the path has. Within a document, the fragment picks out an element id or a PDF page. On mobile, Android App Links and Apple Universal Links work by publishing a small JSON file on the site — assetlinks.json or apple-app-site-association — that names the app allowed to handle the domain; the operating system fetches that file, and matching links then open the app, falling back to the browser when the app is absent. Both files are static, so a static host can serve them without any trouble. What a static host cannot do is generate a deep link on the fly or branch on a parameter, because that needs code running somewhere.
Real-World Example
An agency's portfolio lives at studio-atlas.99helpers.site with each case study at its own path, such as the one for a rail project. A new-business email links straight to that single case study instead of the front page. The prospect sees the relevant work in one click, and the analytics show which case study each recipient opened, which is a far more useful signal than a visit to the home page.
Common Mistakes
- ✕Sending the home page and describing where to click — every extra step costs readers, and some of them never arrive
- ✕Building deep links on a path that is about to be reorganised — without redirects, a restructure kills every one of them at once
- ✕Assuming a mobile deep link always opens the app — if the app is not installed or the association file is missing, the address still has to work in a browser
Related Terms
Permalink
A permalink is an address meant never to change, so that everything pointing at it keeps working. The permanence is a promise from whoever owns the address, not a property of the web.
URL Fragment
A URL fragment is the part after the hash, such as a section name or a page number. It tells the browser where to scroll or what to show, and it is never sent to the server.
URL Anatomy
URL anatomy is the set of parts a web address is built from: scheme, host, path, query string and fragment. Knowing which part is which explains most link problems in seconds.
Link Sharing
Link sharing means sending someone a web address that points at your file, rather than sending a copy of the file itself. One address, one source of truth, any number of recipients.
Static Hosting
Static hosting is a service that stores a folder of finished web files and serves them over HTTP, without running any application code of yours. You upload the folder; the host answers requests for the files in it.
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