Syntax Highlighting Colorize more than 50 pre-installed major languages like HTML, PHP, Python, Ruby or Markdown. You can also create your own settings.

Powerful Find & Replace Super powerful find and replace using the ICU regular expression engine.

Setting via Click There are no complex configuration files that require geek knowledge. You can access all your settings including syntax definitions and themes from a standard preferences window.

Auto Backup You don't need to lose your unsaved data anymore. CotEditor backups your documents automatically while editing.

Outline Menu Extract specified lines with the predefined syntax, and you can jump to the corresponding line.

Split Editor Split a window into multiple panes to see different parts of your document at the same time.

Character Inspector Inspect Unicode character data of each selected character in your document and display them in a popover.

Scriptable Make your own macro in your favorite language, whether it is Python, Ruby, Perl, PHP, UNIX shell, AppleScript or JavaScript.

Incompatible Characters Check and list-up the characters in your document that cannot convert into the desired encoding.