After a user submits a form, they can be redirected to an external URL.
You can add a redirect if you are on a paid plan in the Settings > Emails & Actions tab. Click to add a new Submission Message and select "Redirect to a custom URL".
Then, paste in the URL you'd like to redirect to. This can be to another Formstack form or an external site. To pass submitted form data through the URL, check the "Append Submitted Data to URL" option under the URL. If you are redirecting to a Formstack form, all of the fields with the same field names as contained in the first form will be pre-populated with the previously submitted data when the user is redirected to that second form.
Note - "Append submitted data to a URL" will not be available on certain plans, ie. (Legacy HIPAA Plans and New Healthcare Plans). This process should only be used when looking to pass non sensitive information. PII and PHI data should not be passed via URL query string as it can leave the sensitive data exposed. Please refer to THIS guide if you need a breakdown on what is considered sensitive data. Also take a look at THIS guide that talks through how to properly set up your form to collect sensitive data and make sure you are not violating terms of service.
For example, if the redirect URL is:
https://www.test.formstack.com/forms/my_fun_form
And the submitted data is appended to the URL, the final URL might look something like this if the form consists of fields labeled "Address":
https://www.test.formstack.com/forms/my_fun_form?address-address=234+Happy+Trails&address-city=Funville&address-state=IN&address-zip=45674
Note: Internet Explorer limits URL size to around 2,000 characters, so if you get an error in IE, but not Firefox when appending all the data on your form, you are probably over that character limit. In that case, you would want to create a custom redirect URL passing on only the needed fields instead of all the fields. It would look something this:
https://www.test.formstack.com/forms/my_fun_form?name={$name}
Interested in creating a form with pre-filled fields? Click here to learn more about pre-populating form fields!