# Mac – How to switch back text encoding to UTF-8 with emacs

emacsencoding

Suddenly some of my text files, I'm editing with Emacs had changed and special characters were shown in a strange way, e. g.

\344 instead of ä
\374 instead of ü
… and so on.

In another file I now have

Ã¼ for ü
Ã¤ for ä
….

(I don't know which event was the cause for that, maybe I've been doing something wrong.)

I'd like to convert the document back to its original state (my standard encoding is UTF-8), so that it is displayed correctly with ä, ö, ü, … but I do not know how to do that with emacs.

If you haven't changed the file, you can try M-x revert-buffer-with-coding-system. One of latin-1 or utf-8 should work, depending on the file.
You can also mark the entire file with C-x h and then try M-x recode-region. It will ask you for Text was really in and But was interpreted as. For the first file in your question, it looks like it should be latin-1 and utf-8, and for the second example it should probably be the other way around, utf-8 and latin-1.
After you got it right, you can choose which coding system to save the file with using M-x set-buffer-file-coding-system (or C-x C-m f for short).