Hidden fields can be used to include data that you already have to your form URL and personalise your respondent's form experience or give you better insights into your results. Some use cases for hidden fields:

  • Tag 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 like the name of your respondent using answer piping
  • Pass information from one form to another

You can retrieve the hidden field data and responses on your responses page.

Create a hidden field:


Click '+' or type '/' to insert an input block, search for 'Hidden Fields' and insert the Hidden Fields block:

Add the hidden fields you want to pass on to your form. You can add as many hidden field blocks as you like. If you want to add name and the traffic source of your respondent, add 2 hidden fields block and name them for example 'name' and 'ref'.

Finish your form and publish. Find your URL in the share tab.

When you share the form for example via email and you want to link the name of the respondent to the answers of the form, add the parameters and corresponding values to your URL: ?name=value&ref=value

For example: https://tally.so/r/nPdDxn?name=marie&ref=email

You will find the hidden fields and corresponding answers in the 'Responses' tab.

Mention a hidden field

Read more about how to mention hidden fields in your form using answer piping. You can also add hidden fields to your redirect URL if you use Redirect on completion.

Embed a form with hidden fields

In order for the URL parameters to work with an embedded form, you  need to add them to the embed link (or code), for example:

https://tally.so/embed/63lOvmhideTitle=1&alignLeft=1&name=marie