Free personality tests are fun psychological quizzes that can help you understand your overall personal style related to your approach to tasks, ways of interacting with people, and type of activities you enjoy.
The "free" word is actually a marketing gimmick that induces you to try a service or a product. This tactic is also used by online personality assessment providers, although may be not for Myers-Briggs type of personality tests.
Once you've taken online printable personality tests you will get brief reports or previews of your personality type. On that page you usually are directed to a paid, more comprehensive report page.
So...
An online personality test company
provides Personality Index Overview report. The overview basically is a summary of a paid personality profile test report. As other type of psychometric tests, this free personality test is a fun test.
For example, I received this free personality quiz report:
You like to focus on global issue and leave the checking of details to others. Completing things on time is more important to you than finishing things perfectly. When something needs to be done quickly you are willing to cut corners.
Then I was directed to the paid link:
These are descriptions of two key features of your personal style. To find out more about the other 20 aspects of your personality and how they influence your approach to tasks, ways... order your full Personality Index Report.
At the end of the report you will also be given tips that will help you maximize the utilization of your free personality assessment report.