Export an Org region to RTF and copy it to the clipboard. Ideal for copying source code blocks to Google Docs and preserve syntax highlighting and indentation.

copy-as-rtf.el

(defun dm/copy-as-rtf ()
  "Export region to RTF and copy it to the clipboard."
  (interactive)
  (save-window-excursion
    (let* ((buf (org-export-to-buffer 'html "*Formatted Copy*" nil nil t t))
           (html (with-current-buffer buf (buffer-string))))
      (with-current-buffer buf
        (shell-command-on-region
         (point-min)
         (point-max)
         "textutil -stdin -format html -convert rtf -stdout | pbcopy"))
      (kill-buffer buf))))