On Prolific, it is important to redirect participants back to the Completion URL found on your study's Basic Details page, or provide them with a completion code.

The will look something like:


where 'I2PWSFRG' is the completion code.

Participants will click this URL, or enter the code, to prove that they have completed your study. 

Please make sure that the data has been submitted to your survey software (e.g. Qualtrics, surveymonkey, Gorilla etc.) before participants will have access to the completion URL/code.

There are two ways to provide a completion URL/code:

A) [Recommended]  via automatically "Redirecting to a URL". Some software such as Qualtricssurveymonkey, and others support redirecting to a URL at the end of each submission. Please insert the "completion URL" provided by Prolific as the redirect URL and participants will automatically be returned to Prolific.

B) via a "Custom end of survey message". Here, you can include the completion URL/code at the end of the study and ask participants to click, or copy and paste the link into a new tab. For example, with Google forms go to "Settings" -> "Presentation" and edit the confirmation message to include the completion URL.

You can use the completion URL/code we provide you when you create your study, or you can use your own custom code. Please use the "preview" function to check that this is working smoothly before launching your study.

Please note that submissions marked with an incorrect completion code are not necessarily invalid. Read more about the reasons why this might occur here.

Feel free to get in touch with any questions, or check out our integration guides for more detailed instructions for how to do this with Qualtrics, SurveyMonkey, Gorilla, and others. 

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