Evercookie

Evercookie is a JavaScript research project that demonstrates extremely persistent browser tracking methods. It stores identifying data across multiple browser storage mechanisms so the identifier can be recreated if only some storage locations are cleared. The project was originally useful for showing how difficult it could be for users to fully remove tracking data from older browser environments. It is now most valuable as a privacy and security education tool rather than a recommended modern tracking library. evercookie helps developers, researchers, and privacy advocates understand why browser storage controls, cache clearing, and tracking protections matter. Its main value is exposing the risks of redundant client-side persistence and encouraging better privacy-respecting design.