Hidden form field
Also called Hidden field.
A field in a web form that the visitor never sees, filled in by the page itself. It is how a click identifier, a campaign ID or a browser cookie travels from the landing page into the CRM with the lead.
Why it matters
Capturing the click identifier on the page is only half the job. If the form has no field to carry it, or the CRM has no property to keep it, the identifier is dropped the moment the form is sent and the lead can never be matched to its click.
What goes wrong
Three things all have to hold: a hidden field on the form, a script or a form setting that fills it, and a CRM property the form writes it to. Each one breaks on its own. A form rebuilt in a new tool loses its hidden fields. A field filled only on the landing page stays empty on the second page a visitor reaches before filling in the form. A CRM property that exists but is not mapped in the form's settings receives nothing.
None of this is visible. The form submits, the lead appears, and the only sign is a column that stays blank.
What this product does about it
Check my site sends one test lead through your own site and form, then finds its made-up click ID in your next export or HubSpot pull, including when it landed in a column that is not being read.
How to check it on your own account
Send one test lead through your site with a click ID in the address, then open it in your CRM and look for that ID.
Next to this
- GCLIDGoogle AdsThe identifier Google appends to your landing page URL when someone arrives from an ad and auto-tagging is on.
- fbc and fbpMetaTwo cookies the Meta pixel sets on your site.
- UTM parametersLabels added to a link, such as utm_source=google and utm_campaign=spring, that tell your analytics where a visit came from.
Where this comes up
- Meta Value Optimization for Lead Generation - The Complete GuideHow to give Meta a value for every lead, which of its three optimization goals your account can actually use, why the value has to arrive once and on day zero, and how to tell whether Meta is now finding better customers or just more leads.
- Google Tag Gateway for Lead Generation: What It Fixes and What It Does NotHow Google tag gateway makes measurement more resilient, what it changes for enhanced conversions for leads, and why it does not replace click-ID capture into the CRM.
- Google Ads Click ID Guide: Why Leads Lose Their GCLID and How to Fix ItA lead value Google cannot attribute cannot influence Smart Bidding. The six places a click ID disappears between the ad and the CRM, the one-line script that carries it into every form, the fixes in the order worth doing them, and how to measure click ID coverage rather than upload success.
How it applies in your trade
The same method, worked through for each kind of business: what a lead is worth, what is known on arrival and what to prepare.
The rest of this step
Measure this on your own data
The diagnostic reads a CRM export in your browser and reports your volume, your match rate and the spread between your leads against the thresholds in this glossary. Nothing is uploaded and no account is needed.