Tracking Form Abandonment Without Heavy Scripts
Knowing your form has a problem is one thing. Knowing which exact field is causing it is a completely different level of useful, and you do not need a heavy third party script bolted onto your site to get there.
Why knowing the field actually matters
A conversion rate on its own tells you something is wrong without telling you what. If you know forty people started your form this week and only twelve finished it, you know there is a leak somewhere, but you are still guessing at where.
Once you can see that thirty of those forty made it past name and email, and the drop happens specifically at the budget field, you have gone from a vague problem to a specific one you can actually fix, either by rewording that field, moving it later in the form the way I covered in the multi step form piece, or making it optional entirely.
Why I would avoid the heavy form analytics tools for this
There are dedicated form analytics tools that track every field interaction in detail, and they work, but a lot of them add a meaningful amount of extra script weight to your page just to capture data most sites do not actually need at that level of depth.
Given how much this whole project has been about page speed feeding directly into conversions, it would be a strange trade off to bolt on a heavy analytics script specifically to diagnose a conversion problem, and have that same script start dragging your load time back down.
For most WordPress sites, the setup below gets you genuinely useful field level data using tools you likely already have running.
Setting it up through Tag Manager
If you have already gone through the GA4 tracking audit, you have got Tag Manager talking to your form correctly already, which means most of the groundwork here is done.
The addition needed is a trigger on each field’s blur event, meaning the moment someone clicks or taps away from a field after interacting with it. Each of those triggers fires a lightweight custom event into GA4, tagged with which field was just left. It is a handful of extra triggers rather than a whole new tracking system, and it uses the same GA4 property and the same Tag Manager container you are already running.
Once that is live, GA4 will show you a funnel of sorts across the fields themselves, how many people interacted with field one, how many made it to field two, and so on, without needing to install anything new on the page at all.
Reading the results without overreacting to noise
Give it a couple of weeks of real traffic before drawing conclusions, since a handful of visitors on a low traffic form can make a single field look far worse than it actually is just from small sample size.
What you are looking for is a consistent pattern across enough submissions to trust it, one field where the drop off is meaningfully bigger than the fields around it, not just one or two people who happened to close the tab for reasons that had nothing to do with your form.
Where this fits
This closes out the tracking side of the structural conversion architecture I work through with clients, sitting alongside the GA4 audit as the foundation everything else in the form and layout work builds on. If you would rather check my current availability or join the waitlist to have your own forms and layout paths structurally reviewed, you can find those details over on the enquiry page.