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In Vim, run :syntax enable to turn on syntax highlighting for the current session, or :syntax off to turn it off. To make highlighting start automatically, add syntax enable to your vimrc.
Turn syntax highlighting on or off for this session
Enter these commands in Vim’s command-line mode: press Esc, type the command, then press Enter.
| Goal | Command | Effect |
|---|---|---|
| Enable highlighting while keeping most current color settings | :syntax enable |
Loads Vim’s syntax support while preserving most existing highlight colors. |
| Enable highlighting with standard syntax setup | :syntax on |
Turns on syntax highlighting; it may override colors you have already set. |
| Disable highlighting | :syntax off |
Turns off syntax highlighting for the current session. |
The Vim Reference Manual describes :syntax enable as the command that switches on syntax highlighting. It loads Vim’s syntax support; :syntax off loads the no-syntax setup. If you have customized highlight groups or loaded a colorscheme, prefer :syntax enable to avoid replacing most of those settings.
Make highlighting permanent at startup
Put this line in your vimrc so it runs whenever Vim starts:
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syntax enableOn Unix-like systems, the usual user configuration file is ~/.vimrc. Other platforms use their own vimrc location. Vim’s User Guide recommends this setting for users who always want syntax highlighting: put :syntax enable in your vimrc.
Check filetype detection when highlighting is missing
Vim needs to identify the buffer’s language so it can apply the matching syntax rules. Check the current settings with :filetype; the output reports whether filetype detection, plugins, and indent support are on or off.
- Run
:filetypeto inspect filetype detection. - If detection is off, run
:filetype on. - Ask Vim to identify the current buffer with
:filetype detect, or close and reopen the file. - Check the result with
:set filetype?. - If Vim has not identified the language correctly, set it explicitly, for example
:set filetype=python.
The Vim filetype reference explains how filetype detection and syntax support work together. Filetype plugins and indentation are separate options: :filetype plugin on enables filetype-specific plugins, and :filetype indent on enables filetype-specific indentation; neither is required just to switch syntax highlighting on.
Toggle highlighting with one command
To switch between enabled and disabled states interactively, enter:
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if exists('g:syntax_on')
syntax off
else
syntax enable
endifThis checks Vim’s syntax-on state and turns highlighting off if it is active; otherwise, it enables it.
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Fix incorrect colors or slow editing
- Colors changed unexpectedly: Run
:syntax enablerather than:syntax onif you want to preserve most existing colors. Review your active colorscheme with:colorschemeand any custom:highlightcommands. - No language-specific colors appear: Verify the detected type with
:set filetype?. Turn on detection with:filetype on, run:filetype detect, or set the correct type manually. - Long lines make editing slow: Reduce the maximum column Vim scans for syntax with the
'synmaxcol'option. For example,:set synmaxcol=200limits syntax processing to the first 200 columns of a line. Choose a limit that suits your files; text beyond it may not receive syntax highlighting. See the syntax reference for details.
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