What kind of file is necessary for uploading contacts into Qualtrics?

The correct file type for uploading contacts into Qualtrics is a .csv file. A .csv, or comma-separated values file, is a widely recognized format that allows for easy manipulation and importation of data. It organizes information in a tabular structure, where each line represents a record (in this case, a contact), and columns are typically separated by commas.

Qualtrics accepts .csv files for upload because they can contain various fields relevant to contacts, such as names, email addresses, and any other custom attributes organizations might use to categorize their participants. This format ensures that data can be imported effectively, maintaining the integrity and structure necessary for the platform to function correctly.

In contrast, the other options do not align with the requirements for contact uploads in Qualtrics: .json files are utilized for structured data interchange but are not suitable for bulk contact uploads; .xml files serve similar purposes in data representation but are also not the required format here; and .html files are used for web pages and cannot facilitate the upload of structured contact data to Qualtrics.