UniKey is the most popular Vietnamese keyboard for Windows. The core UniKey Vietnamese Input Method is also the engine for many Vietnamese keyboards in Linux, macOS and iOS. UniKey is free of charge. Source code for the UniKey Vietnamese Input Method is distributed under the GNU General Public License. Please note: unikey.org is the only official website of UniKey. The author is not responsible for any other websites providing UniKey software. June 8, 2025: Released Unikey 4.6 RC2 ARM64 , natively built and optimized for Windows running on Snapdragon processors. Released Unikey 4.6 RC2 ARM64 , natively built and optimized for Windows running on Snapdragon processors. September 29, 2023: Released UniKey 4.6 RC2 . This version added Simple Telex to the list of built-in input methods. Released UniKey 4.6 RC2 . This version added Simple Telex to the list of built-in input methods. September 15, 2023: Released UniKey 4.6 RC1 , with an important feature - Per App On/Off Mode . Released UniKey 4.6 RC1 , with an important feature - Per App On/Off Mode . August 24, 2023: Released UniKey 4.5 RC1 , with lots of bug fixes and improved handling of macro file. Released UniKey 4.5 RC1 , with lots of bug fixes and improved handling of macro file. July 2, 2018: Released UniKey 4.3 RC3 with bug fixes for Excel and browsers (Chrome, Edge, Firefox, Internet Explorer). Released UniKey 4.3 RC3 with bug fixes for Excel and browsers (Chrome, Edge, Firefox, Internet Explorer).

June 23, 2018: Released UniKey 4.3 RC1 From version 4.3, all UniKey releases will be digitally signed. See UniKey’s signature . Released UniKey 4.3 RC1 From version 4.3, all UniKey releases will be digitally signed. See UniKey’s signature . UniKey supports: Many Vietnamese character sets/encodings: Unicode, TCVN3 (ABC), VIQR. VNI, VPS, VISCII, BK HCM1, BK HCM2, etc. Unicode UTF-8, Unicode NCR Decimal/Hexadecimal for Web editors. Unicode, TCVN3 (ABC), VIQR. VNI, VPS, VISCII, BK HCM1, BK HCM2, etc. Unicode UTF-8, Unicode NCR Decimal/Hexadecimal for Web editors. All 3 popular input methods: TELEX, VNI and VIQR. All Win32 platforms: Windows 11, 10, 8, 7, Vista, 2000, XP, 9x/ME. UniKey is very small, does not need any additional library. No installation is required.