Recording participants' Prolific IDs in your study/survey

To link answers in your survey tool to participants in Prolific, you'll need to set up your survey to record our participants' unique Prolific IDs.

This enables you to match our participant demographic data with responses. If you do not record participant IDs, you will not know who has submitted which individual survey response. As a result, you won't know which ones deserve approval or rejection.

We recommend recording IDs automatically, which can be done using URL parameters. Alternatively, you can include a question in your study asking participants for their ID.

Adding a question in your study

You can simply ask participants for their Prolific ID as a question within your study, like this:

Prolific IDs have 24 alphanumeric characters - please ensure the question field in your survey accepts both numbers and letters.

Automatic recording of Prolific IDs via URL parameters [Recommended] 

If your experimental software supports it, you can also get the participants' Prolific IDs from a query string. This means that participants won't have to copy & paste their IDs into your survey software, but instead the system will automatically enter the IDs for participants.

The example below outlines how to do this using Qualtrics. Check out our Typeform and Gorilla integration guides if you're using those platforms!

Firstly, you need to ensure that the IDs are recorded in your data set. To do this in Qualtrics, go to "Survey Flow" and add an "Embedded Data" element right at the beginning of your study. Into the embedded data field, enter "PROLIFIC_PID" and make sure that it says "Value will be set from panel or URL":


Now go to the survey item that is supposed to record the participant's Prolific ID, right-click on the text-entry field and click on "Default Choices":



On the window that opens click on the blue drop-down arrow to the right of the text-entry box, and go to 'Embedded data field'.  


Here, either enter "PROLIFIC_PID", or click the drop-down arrow to the right of the text entry box and select "PROLIFIC_PID", then click "Insert". This will yield a string called "${e://Field/PROLIFIC_PID}". Now click save, and you're done! 


This is what your question asking for the participant's Prolific ID should look like in the end:


You can visit this help page for more information and examples of how to do this with Qualtrics.

Finally, parameters need to be added to your Study URL in order to pass the Prolific ID through the query string. To do this, tick the "I'll use URL parameters" option in the "Study Link" section of the study creation form:

This will append the parameters to your study URL. The default name is "PROLIFIC_PID" so you shouldn't need to change anything here, but parameter names can be changed by selecting "Configure parameters" if needed.

Your Study URL should now look something like this:


When you publish your study, participants will each visit a unique URL of the form:

In addition, 'STUDY_ID' will be replaced with an ID unique to your study, and 'SESSION_ID' will be replaced with ID unique to the participant's submission. These parameters can be removed from your URL if you only wish to record participant Prolific IDs.

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