You can use URL parameters to pass data into hidden fields in your form. This lets you include information you already have in the form URL, helping you personalize the respondent’s experience and gain more detailed insights from your results.

<aside> <img src="/icons/gift_green.svg" alt="/icons/gift_green.svg" width="40px" /> Hidden fields are available for free to all Tally users.

</aside>

What is a hidden field?

A hidden field lets you track respondents and use already collected data to personalize your forms. It’s invisible to anyone filling out a form but lets you gather and use data effectively.

Some examples may include:

• Track the traffic source of your respondent (social media, triggers on your website, or other)
• Pass on information about your respondent to your responses (like name or email address)
• Mention information in your form, such as your respondent’s name, using answer piping
• Prefill the input fields on your form
• Pass information from one form to another
• Pass on UTM parameters to track marketing campaigns