What is a legitimate and free service one can use to test one's IQ?

Hello. I also recently looked for a service where you can take both a professional and a free IQ test. As a result of browsing various sites, I decided to stop at this https://iq-global-test.com/ As it was compiled by experienced psychologist experts, which allows for a normal distribution of results. In addition, when passing a professional IQ test, you receive a personalized certificate.

The stuff on the internet is, without exception, far too limited in scope to be reliable, and some are downright fraudulent.
The cheapest option is the Mensa test, they test people in groups at a fraction of the price if a private test, but on the downside, all you get is the number.