Hidden fields

Pass data into a submission without showing it to the respondent — a UTM source, a campaign ID, a user ID from your own app — so every response arrives already tagged with the context it came from.

Key capabilities

• Add any number of hidden fields from the Share tab of your form settings
• Values are passed as parameters on the generated embed code
• Works with both the Embed to the web page and Share the link options
• When using Share the link, hidden fields are appended as URL query parameters (?hidden=...)
• Shows up in the submitted response alongside the visible fields

Common uses

• Tag submissions with source=facebook or source=newsletter to track where responses come from
• Pass a logged-in user's ID so you can link a submission back to their account

Learn more

• How to add hidden fields