Unikey is the best Vietnamese input software by now developed by Pham Kim Long. It's the most popular Vietnamese input method and it's a free software. You can download install file or runnable file (in a zip file, which contains an .exe file and a .dll file).

There are two method of inputting Vietnamese: TELEX (use alphabet keys only) and VNI (use numeric keys for Vietnamese tones as well as Vietnamese special characters).

When you are using Unikey, you can click on its icon on taskbar to change between Vietnamese mode (V) and English mode (E) or you can use shortcut key "ctrl + left shift" (You can change this shortcut to "alt + z" if you want).

Note: A Vietnamese keyboard may be added automatically to your computer.

You can add Vietnamese keyboard in Windows to type Vietnamese but it's inconvenient because you will have to use numeric keys to type Vietnamese tones and special characters.

Vietnamese Keyboard Layout:

Vietnamese tones:

Vietnamese special characters:

You can add Vietnamese keyboard to type with TELEX method.

You can choose Vietnamese Inputting Method when starting Unikey:

Example:

Example:

Be careful if you set a password or type a password when Vietnamese mode of Unikey is ON. You may get a wrong password or just simply cannot log in.