The word "conversion" is doing a lot of work here. It means whatever goal the business defines: a purchase, a signup, a form submission, a booked call. What makes it tracking, rather than just an analytics number sitting on a website, is the second half of the definition, connecting that outcome back to the click, campaign, or post that produced it. A store can know it made ten sales today without conversion tracking. Knowing that six of those ten came from one Instagram story is the part conversion tracking adds.
How does conversion tracking work
The mechanism has two ends that have to talk to each other, and most conversion tracking failures happen in the handoff between them, not in either end alone.
The click end
A link carries a UTM parameter or a platform's own click identifier, a Meta click ID or a Google click ID, for instance, when someone clicks it. That identifier travels with the visitor into the destination site, usually as part of the URL, sometimes dropped into a cookie once they land.
The destination end
On the other end, the destination site needs its own tracking installed, a pixel, a tag, or a server side event, that fires when the goal action happens: an order confirmation page loads, a form posts successfully, a checkout completes. That event carries the click identifier along with it, or pulls it from the cookie set earlier. It reports back to whichever system is trying to close the loop, an ad platform's conversions API, a Shopify webhook, or an analytics tool's event log.
When both ends are wired correctly and the identifier survives the trip between them, a conversion gets matched to the click that produced it. When either end is missing, the identifier gets lost, or the two systems are not on speaking terms, the conversion happens but never gets attributed to anything.
Click tracking vs conversion tracking
| Click tracking | Conversion tracking | |
|---|---|---|
| Measures | That a click happened, and where it came from | What the visitor did after the click |
| Where it runs | On the tracking link, before the destination loads | On the destination site, after the visitor arrives |
| Requires code on the destination | No | Yes, a pixel, tag, or webhook installed there |
| Typical output | A click count, broken down by source or campaign | A conversion count, or a conversion rate, tied to a source |
| Who can measure it | Whoever owns the link | Whoever owns the destination site |
That last row is the one people skip past, and it is the most important one. A link tracker only controls the link. It has no code running on the page the visitor lands on, so it cannot see a purchase, a signup, or anything else that happens there unless the destination site is separately wired to report it back.
The limit almost nobody states plainly
A link-in-bio or click tracking tool cannot see what happens on someone else's website after the click, full stop. This is not a missing feature waiting on a roadmap, it is a structural fact about how the web works: a tool only has visibility into pages and requests it actually serves. If a link points from a bio page to a Shopify store, the bio tool sees the click, and the Shopify store sees the sale, and the only thing connecting the two is whatever identifier survived the trip between them, typically a UTM parameter that Shopify's own analytics or an ad platform's tag picks up on arrival. Plenty of link tracking tools imply, in their marketing, that they measure conversions end to end. Very few actually can, unless they are also the platform processing the sale.
The nearest honest thing a link tracker can offer, absent that integration, is a clean handoff: a UTM parameter attached consistently to every link, so that whatever analytics or ad platform is watching the destination site can pick up the source and stitch the conversion back together on its own end. Raydar's link pages attach UTM data and a first-touch and last-touch cookie to every click, which is the click side of that handoff done correctly, but the conversion still has to be recorded by whatever tool is running on the destination, a store's own analytics, an ad platform's pixel, or a CRM.
Where conversion tracking commonly breaks
The identifier gets dropped most often. A redirect chain, a link shortener stripping query parameters, or a site that ignores UTM tags on landing can all sever the connection before the destination page even sees it. Other times the destination has no tracking installed at all, and a form that emails a submission with no tag firing on success has no way to report a conversion back to anything.
Cross device journeys are a common break too. Someone clicks on a phone, then buys later on a laptop, and unless both sessions are tied to a shared login or a platform's own cross device matching, that conversion looks disconnected from the click that started it. Ad blockers and browser tracking prevention add another failure point, since pixel based conversion tracking on the destination is exactly the kind of client side script these tools are built to block, which is part of why server side conversion APIs have become the more durable option.
What to actually set up
For most small businesses and creators, real conversion tracking means three things working together, not one tool doing everything: consistent UTM parameters on every outbound link (built with something like a UTM builder rather than typed by hand each time), click level data on the link side, referrer, campaign, timestamp, which is what click tracking provides, and an actual conversion event installed on the destination, whether that's an ecommerce platform's own analytics, an ad platform's pixel, or a CRM logging a form fill. Skip any one of the three and there's a gap in the story somewhere between the click and the sale.