LZ-based compression algorithm for Java
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Latest commit 51e8fdd Nov 3, 2017


lzstring4j - LZString for Java

lzstring4j is an easy to use implementation of JavaScript LZString Library for Java.

This idea is inspired by lz-string-java.


  • Based on JavaScript LZString Library (version 1.3.3)
  • UTF-16 compression
  • Base64 compression
  • Interoperable with the JavaScript Library through the UTF-16 compression methods (Java Server -> JS on Web or Node.js server -> Java Client/Android) thanks to this post.

How to use

Using lzstring4j is quite simple. But lets see:

Checkout and compile the project:

git clone https://github.com/diogoduailibe/lzstring4j.git
cd lzstring4j
ant jar
mv jar/lzstring4j.jar /path/to/your/libs/project

If you're using ant, change your build.xml to include lzstring4j.jar. If you're eclipse, add the jar to your project buildpath.

Afterwards, you'll be able to use this library:

Normal Compression and Decompression:

	    // Normal Compression and Decompression
		String test = "Lets see how much we can compress this string!";

		String output = LZString.compress(test);

		System.out.println("Compressed: " + output);

		String decompressed = LZString.decompress(output);
		System.out.println("Decompressed: " + decompressed);

UTF-16 Compression and Decompression:

		//UTF-16 Compression and Decompression 
		String testUTF16 = "Lets see how much we can compress this string!";

		String outputUTF16 = LZString.compressToUTF16(testUTF16);

		System.out.println("Compressed: " + outputUTF16);

		String decompressedUTF16 = LZString.decompressFromUTF16(outputUTF16);
		System.out.println("Decompressed: " + decompressedUTF16);


git clone https://github.com/diogoduailibe/lzstring4j.git


to build a jar-file:

ant jar
ls jar/lzstring4j.jar

You'll find the lzstring4j-jar in jar/lzstring4j.jar


Please report any bugs feature requests to the Github issue tracker


This Library was designed with portability in mind.

  • Android is fully supported.
  • JRE is fully supported.


  • Improve code to execute more efficiently
  • Update to version 1.4.4
  • More tests...

CONTRIBUTORS (Thanks to all, by the way!)

License - the boring stuff...

See LICENSE file.