Nobody Fills Out Your Form and You Don't Know Why

I watched a screen recording last week where a user tried to submit a lead gen form seven times. Seven. Each time, the form threw a vague "Please fix errors" message at the top of the page, but the actual error was on a phone number field that was scrolled out of view. The user gave up. That was a $200 lead, gone.

This isn't rare. We've analyzed form behavior across dozens of funnels at FunnelLeaks, and roughly 28% of form abandonment comes from validation errors that users can't find or understand. Not from people who weren't interested. From people who wanted to convert but couldn't.

What Form Field Error Tracking Actually Means

You're probably tracking form submissions. Great. But are you tracking form field errors? There's a massive difference.

Form field error tracking means recording exactly which fields trigger validation errors, how often, and what the user entered (or tried to enter). It means knowing that your ZIP code field rejects Canadian postal codes. That your phone field doesn't accept the format "(555) 123-4567" even though that's how most people type phone numbers. That your email validation flags "user@company.co" as invalid because it expects a three-letter TLD.

These are the micro-failures that kill your conversion rate. And without tracking them, you'll never know they exist.

How to Set This Up Without Overcomplicating It

You don't need a PhD in analytics to track form errors. Here's the simplest approach that actually works.

Add event tracking to your form's error handler. Every time a validation error fires, send an event to Google Analytics (or whatever you use) with the field name and the error message. That's it. One event per error, with two custom dimensions.

If you're on a platform that makes custom JavaScript difficult, tools like Hotjar or FullStory can capture form interactions including errors. We've found Hotjar particularly useful for this because its form analysis report breaks down abandonment by field automatically.

For Shopify checkout forms, you're more limited since you can't add custom JS to the checkout (unless you're on Shopify Plus). But you can still monitor checkout completion rates and cross-reference with error logs from Shopify's admin.

What to Do With the Data

Once you have form field error tracking in place, review it weekly. Here's what to look for:

Fields with the highest error rates. If 15% of users are triggering an error on a specific field, that field's validation is too strict or the label is confusing. Fix the validation first, then improve the label.

Repeat offenders. If the same user triggers the same error multiple times, your error message isn't clear enough. "Invalid input" tells them nothing. "Phone number must be 10 digits, like 5551234567" tells them exactly what to fix.

Mobile vs. desktop differences. Form errors spike on mobile because of auto-fill quirks, smaller screens, and different keyboard layouts. I've seen a date field that worked perfectly on desktop but was unusable on iOS because the date picker format didn't match the validation.

Your Forms Are Costing You More Than You Think

A 28% abandonment rate from form errors means you're leaving nearly a third of your potential conversions on the table. Not because your offer is bad or your traffic is wrong, but because your form is fighting the people who want to buy from you.

Fix the tracking first. Then fix the forms. If you want to monitor form completion rates across your entire funnel automatically, check out FunnelLeaks. We'll show you exactly where users are getting stuck, so you can stop guessing and start fixing.