How do I sort my Safari bookmarks alphabetically?

Sort bookmarks

Safari 11 and Safari 12

Section: Rearrange or sort bookmarks

" Control-click the folder in the sidebar,

then choose Sort By > Name or Sort By > Address. Address is the website URL.”

https://support.apple.com/guide/safari/bookmark-webpages-that-you-want-to-revisi t-ibrw1039/12.0/mac/10.14

Note: You will have to sort one folder at a time.

At present there is no way to sort all bookmarks folders at once.

Safari Bookmarks sort, for those running Snow Leopard OS or later versions of OS X there is SafariSort:

http://www.safarisort.com/

Sorting folders has to be done manually by dragging and dropping.

Safari doesn't provide an automatic sorting folders option at present unfortunately.