Open Safari
Click Safari in the menu bar
Select Settings (or Preferences)
Go to Privacy
Click Manage Website Data
Select Remove All (or choose specific sites and click Remove)
Confirm by clicking Remove Now (or Remove)
To delete a single site’s cookies: search the site in the list, select it, then click Remove
To clear cookies for a specific browsing session: open Safari menu → Settings (or Preferences) → Privacy → turn on Prevent cross-site tracking (optional)
To clear browsing data: open Safari menu → Settings (or Preferences) → Advanced → enable Show features for web developers
In the menu bar, click Develop
Select Empty Caches (optional)