I need to create a .css file on my Mac. I created it with TextEdit. How do I now save it with a .css extension? It seems that very single File Format it offers will give it a different extension (rtf, html, odf, docx, xml, doc)?!
MacOS – How to save files on Mac with extension I want
file extensionsmacmacostextedit
Related Solutions
I tried to recreate your Problem and noticed that you probably have not enabled the "Show all File Extensions" option in the Finder Preferences.
You can check by selecting the Finder and selecting "Preferences" from the Menubar. A small window should appear, titled "Finder Preferences". Select the "Advanced" Icon at the Top of that window. You should now see the option "Show all File Extensions", it should be checked. All files in your finder window should now show their extensions, like .txt or in your case .crt
You can now easily change all files to another extension.
If that does not work then the Fileextension is probably linked to another application. .crt-Files should link to the Keychain-Application which handels all certificates. You can check by selecting the crt-File and pressing "command" + "i". An information window should appear with additional information to that file. At the Entry "open with" should appear "Keychain.app".
The format menu has a toggle to switch things for you.
Pressing shift + command + T will toggle the document to plain text mode.
You can also set the default format in the preference pane for the app.
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Best Answer
It sounds like you are in rich text mode, so the editor is trying to save the file in non-plain text format. In general for css/html/code you want just plain text.
In the "Format" menu, choose "Make Plain Text" then when you do a "Save As..." you should be able to just type whatever extension you need.
EDIT -- As Tetsujin mentions, you do should uncheck the 'if no extension, set as .txt' in the save menu so it doesn't try to append .txt as an extension.