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Downloading ICU


Official Releases

If you want to use ICU (as opposed to developing it), it is recommended that you download an official packaged version of the ICU source code. These versions are tested more thoroughly than day-to-day development builds of the system, and they are packaged in zip and tar files for convenient download. Here are several recent releases of ICU that are available:

Release ICU4C ICU4J Major Changes
ICU 49     Note: We are changing the ICU release version numbering, combining the first two fields into one. The next release after ICU 4.8 will be ICU 49 then ICU 50 etc.
ICU 4.8 4.8.1.1 4.8.1.1 CLDR 2.0, MessageFormat rewrite, collation script reordering
ICU 4.6 4.6.1 4.6.1.1 CLDR 1.9, Unicode 6.0, UTS #46 support, collation enhancements, alternate number symbols
ICU 4.4 4.4.2 4.4.2.2 CLDR 1.8, Unicode 5.2, compact resource bundle, Java 5 syntax
ICU 4.2 4.2.1 4.2.1.1 CLDR 1.7 update, Number system
ICU 4.0 4.0.1 4.0.1.1 CLDR 1.6 update, Unicode 5.1 update, ICU4J charset
ICU 3.8 3.8.1 3.8.1 CLDR 1.5 update, additional calendars, improved time zone support, improved charset conversion performance.
ICU 3.6 3.6 3.6.1 Unicode 5.0 update, UCA 5.0 update, CLDR 1.4 update, ICU4C charset detection, improved ICU4C break iterator
ICU 3.4 3.4.1 3.4.5 Unicode 4.1 update, CLDR 1.3 update, ICU4J charset detection, ICU4C high performance text access
ICU 3.2 3.2.1 3.2 CLDR 1.2 integration.
       
Prior
Releases:
(mirror) 
 These are the previous releases of ICU.
Due to the age of these older releases, it is recommended that you use a newer version of ICU for current development.

For more details on building ICU once you've checked out the code, please see the readme.html in ICU.

Latest Development Milestone


The latest development milestone is ICU 49M2 (2011-12-14). The development milestone release is intended for those who want to get an early look at next ICU major release features. It is not recommended for production use.

Other Downloads

The following are some ICU tools that are available in addition to ICU.

Tool Description
ICU4J Time Zone Update Utility This tool provides a simple way to update installed copies of ICU4J with the latest time zone data. Updates are required when the rules for transitioning between standard time and daylight (summer) time change in any part of the world.
RB Manager This resource bundle manager allows you to edit your program resource bundles more easily through a user-friendly interface. It also allows importing and exporting of resources to multiple formats.
XLIFF2ICUConverter This tool allows you to convert XLIFF files to ICU ResourceBundle format.
 ICU4JNI  ICU4JNI provides Java Native Interface bindings to ICU4C collation and conversion routines.

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