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Fcitx is a lightweight input method framework aimed at providing environment independent language support for Linux. It supports a lot of different languages and also provides many useful non-CJK features.


Install the fcitx package.

Input method engines

Fcitx provides built-in input methods for Chinese Pinyin and table-based input (for example Wubi).

Depending on the language you wish to type, other input method engines are available:



  • fcitx-mozc, based on Mozc, the Open Source Edition of Google Japanese Input.
  • fcitx-kkc, a Japanese Kana Kanji input engine, based on libkkc.
  • fcitx-anthy, a popular Japanese input engine. However, it is not actively developed anymore.

Other languages

Input method module

To obtain a better experience in Gtk+ and Qt programs, install the fcitx-gtk2, fcitx-gtk3, fcitx-qt4 and fcitx-qt5 input method modules as your need, or the fcitx-im group to install all of them. Without those modules, the input method may work on most applications but you may experience input method hang up, preview window screen location error or no preview error.

Applications below do not use Gtk+/Qt input module:

  • Applications use Tk, motif or xlib
  • Emacs, Opera, OpenOffice, LibreOffice, Skype, Wine, Java, Xterm, urxvt, WPS


Others packages (including git version) are also available in the AUR. All components of fcitx will requires fcitx to restart after install.


Note: You need to have Chinese, Japanese, Korean or Vietnamese font installed to be able to enter the corresponding characters.

Desktop Environment

If you are using any XDG compatible desktop environment such as KDE, GNOME, Xfce, LXDE, after you re-login, the autostart should work out of box. If not run the fcitx executable. To see if fcitx is working correctly, open an application and press Ctrl+Space (the default shortcut for switching the input method) to invoke fcitx and input some words.

If fcitx failed to start with your desktop automatically or if you want to change the parameters to start fcitx, configure autostart[broken link: invalid section] or edit the fcitx-autostart.desktop file in your ~/.config/autostart/ directory (copy it from /etc/xdg/autostart/ if it doesn't exist yet).

When other input methods with xim support are also running, fcitx may fail to start due to an xim error. Ensure that no other input methods are running before you start fcitx.

Non desktop environment

Define the environment variables to register the input method modules and support xim programs.


Re-login or reboot to make these environment changes effective.

If fcitx process does not start automatically, you might need to add fcitx & in your ~/.xinitrc.

  • Avoid .bashrc for this, see GregsWiki:DotFiles.
  • If all Qt apps have problem with fcitx, run qtconfig (qtconfig-qt4), and go to the third tab, make sure fcitx is in the Default Input Method combo-box.


Optionally, you can use xim in your GTK+ and/or Qt programs without installing the above modules in which case you need to change the corresponding lines above as following:

Warning: Using xim can sometimes cause problems including not being able to input, no cursor following, word selection window issue, application freeze on input method restart. For these xim related problems, Fcitx cannot provide any fix or support. This is the same with any other input method framework, so please use the GTK+ and Qt input method modules instead of xim whenever possible
Note: Gtk2 uses /usr/lib/gtk-2.0/2.10.0/immodules.cache as immodule cache file since 2.24.20. If you have set GTM_IM_MODULE_FILE environment variable or do not use install script of official packages to update the cache, please change/clear the environment variable and use /usr/bin/gtk-query-immodules-2.0 --update-cache to update immodule cache.


GUI configuration tools

fcitx provides a KDE configuration module (kcm-fcitx) and a GTK3 configuration tool (fcitx-configtool).

Run fcitx-config-gtk3 after fcitx-configtool is installed. Unset Only Show Current Language if you want to enable an input method for a different language.

Stop fcitx manually before changing configuration, or the change may be lost.

In order to enable spell checking, press Ctrl+Alt+h when fcitx is on an input method provided by fcitx-keyboard.

Input methods configuration

You can add/remove input methods in the GUI tools. Set the first item to Keyboard layout (e.g. Keyboard - English) if you want to enable/disable other input methods quickly.

Change default UI

Fcitx support kimpanel protocol to provide better desktop integration.

  • Gnome-Shell: You can install kimpanel from extensions.gnome.org or gnome-shell-extension-kimpanel-gitAUR, which provides a similar user experience as ibus-gjs.
  • KDE: kimtoy could use skin from Sogou and fcitx.

Extend pinyin dictionary

Pinyin dictionary is located at ~/.config/fcitx/pinyin. File pybase.mb is for single characters and file pyphrase.mb defines pinyin phrases. To extend them, put your file into /usr/share/fcitx/pinyin and restart fcitx.


You can download skins and extract them to one of the following directories, you can create the directory if it doesn't exist:

/usr/share/fcitx/skin   #Global settings
~/.config/fcitx/skin    #User settings

Cloud Pinyin configuration

After installing the fcitx-cloudpinyin input method, restart fcitx. If you could not find it in configuration GUI, enable advanced settings. The cloud query result will be added to current input method dictionary automatically.

If your network prevents you from accessing Google, change Cloud Pinyin source to Baidu.

The query result from cloud will list as secondary candidate by default and it is configurable. If the result already exists, only one item is shown.

Note: Set query result as first candidate is not recommend because the dictionary order will be changed if query returns an empty result

Tips and tricks

Clipboard Access

You can use fcitx to input text in you clipboard (as well as a short clipboard history and primary selection). The default trigger key is Ctrl-;. You can change the trigger key as well as other options in the Clipboard addon configure page.

Note: This is NOT a clipboard manager, it doesn't hold the selection or change its content as what a clipboard manager is supposed to do. It can only be used to input from the clipboard.
Warning: Some clients do not support multi-line input, so you may see the multi-line clipboard content pasted as a single line using fcitx-clipboard. This is either a bug or feature of the program being used and it is not something fcitx is able to help with.


Disable or change Extra key for trigger input method [sic]

This setting is under the Global Config tab and defaults to SHIFT Both, meaning that pressing either shift key will immediately change input methods. Although it should only apply when a shift key is pressed individually, it tends to randomly interrupt typing capital letters, selecting text with the keyboard, etc. while using standard keyboard input.

In addition, this setting may revert to default without warning at any time. To ensure fcitx's config cannot be modified, you must make fcitx's config file immutable: # chattr +i ~/.config/fcitx/config.

Diagnose the problem

If you have problems using fcitx, eg. Ctrl+Space fail to work in all applications, then the first thing you should try is to diagnose using fcitx-diagnose. The output of fcitx-diagnose should contain the clue to most common problems. Providing the output of it will also help when you consult other people(eg. in IRC or forums).


If your LC_CTYPE is English, you may not be able to use input method in emacs due to an old emacs bug. You can set your LC_CTYPE to something else such as zh_CN.UTF-8 before emacs starts to get rid of this problem.

Note that the corresponding locale should be generated on your your system.

The default fontset will use `-*-*-*-r-normal--14-*-*-*-*-*-*-*' as basefont (in src/xfns.c), if you do not have one matched (like terminus or 75dpi things, you can look the output of `xlsfonts'), XIM can not be activated.

Emacs Daemon

If you are using emacs daemon/client mode, LC_CTYPE should be set when starting the daemon. For example, by running emacs daemon with LC_CTYPE=zh_CN.UTF-8 emacs --daemon.

If starting emacs daemon from systemd, set Environment="LC_CTYPE=zh_CN.UTF-8" "XMODIFIERS=@im=fcitx" in the unit file.

(XMODIFIERS may need to be set explicitly here as systemd doesn't load .xprofile. Check the initial-environment variable in emacs to verify both variables are set correctly.)

Firefox popup menu not work

For Firefox above version 13, the popup menu may fail to work due to xim, make sure that fcitx-gtk3 along with a latest version fcitx are installed.

Ctrl+Space fail to work in GTK programs

This problem sometimes happens especially when the locale is set as English. Please make sure your GTK_IM_MODULE is set correctly.

See also FAQ

If you have set the *_IM_MODULE environment variables to fcitx but cannot activate fcitx, please check if you have installed the corresponding input method modules.

Some programs can only use xim, if you are using these programs, please make sure your XMODIFIERS is set properly and be aware of the problems you may have. These programs include all programs that are not using GTK or Qt (e.g. programs that use tk, motif, or xlib directly), emacs, opera, openoffice, libreoffice, skype.

If you cannot enable fcitx in gnome-terminal under Gnome and the above way doesn't work, try:

$ gsettings set org.gnome.settings-daemon.plugins.xsettings overrides "{'Gtk/IMModule':<'fcitx'>}"

Buildin Chinese Pinyin Default NOT ACTIVE

If your locale is en_US.UTF-8, fcitx did NOT enable the buildin Chinese Pinyin input method by default. There is only fcitx-keyboard-us input method enabled. You can get a notice by fcitx-diagnose command like this:

   ## Input Methods:
       1.  Found 1 enabled input methods:
       2.  Default input methods:
           **You only have one input method enabled, please add a keyboard input method as the first one and your main input method as the second one.**

Then you should add Pinyin or Shuangpin input method to actived input methods by the GUI configure tool.

fcitx and KDE

For some reasons, KDE doesn't handle keyboard layouts properly. For example, if you switch from US (English) to LT (Lithuanian), all numbers on the keyboard should produce Lithuanian letters, but they still produce numbers as the output. This can be fixed by these steps:

  1. Turn off fcitx if it is running in the background.
  2. Disable stuff related to KDE:
    1. At System settings > Input devices > Layouts (tab) make sure that Configure layouts is unchecked.
    2. At System settings > Input devices > Advanced (tab) make sure that Configure keyboard options is unchecked.
  3. Start fcitx to start it. You can close the terminal - fcitx will still be running in the background.
  4. Set up your needed layouts (right click on the system tray icon, then Configure).
  5. Right click on the system tray icon, then Exit

At this point you should have working layouts, native KDE layouts switch icon should appear and you can switch them by mouse scroll or click on it.

Input method switched to English unintentionally

For instance, in XMind, when the user presses Enter to create a node, input method is always switched to English, and has to be switched back to Chinese manually.

To fix this issue, open the fcitx GUI configuration tool (provided by fcitx-configtool), switch to tab Global Config, in dropdown menu Share State Among Window, select PerProgram or All.

xmodmap settings being overwritten

fcitx controls keyboard layout, so your xmodmap settings will be overwritten. Since 4.2.7, Fcitx will try to load ~/.Xmodmap if it exists.

For more details on how you can save your xmodmap changes see FAQ

See also