Cloudflare Cookies Descriptions 2026

  • __cf_bm: This cookie is used to manage incoming traffic that matches “bot” criteria. It helps Cloudflare distinguish between humans and bots in order to prevent spam or scraping attacks. It expires after 30 minutes.

  • _cfuvid: This cookie is only activated if Rate Limiting policies are in place. It is used to identify an individual user behind a shared IP address and ensure they are not incorrectly blocked. It expires at the end of the session.

  • cf_clearance: This cookie appears when a user completes a “Challenge” (the “Checking if you are human” verification). It stores proof that the user has successfully passed the validation so they do not have to repeat it constantly. It typically lasts between 30 minutes and several months, depending on your specific settings.