M4uHDFree was a website that offered free streaming of movies and television series. Unlike legitimate subscription services such as Netflix, Hulu, or Amazon Prime, M4uHDFree did not require users to create an account or pay a monthly fee. Instead, it aggregated content from various third-party sources and embedded it on its own pages, organizing it by genre, release year, country, and IMDb rating.

Fake "captcha" pages or "verify you are human" screens often redirected to convincing but fraudulent login portals, tricking users into entering their real email, password, or even credit card information.