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Lossless compression
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===General purpose=== * [[Asymmetric numeral systems|ANS]] – Entropy encoding, used by [[LZFSE]] and [[Zstandard]] * [[Arithmetic coding]] – Entropy encoding * [[Burrows–Wheeler transform]] reversible transform for making textual data more compressible, used by [[bzip2]] * [[Huffman coding]] – Entropy encoding, pairs well with other algorithms * [[LZ77 and LZ78|Lempel-Ziv compression]] (LZ77 and LZ78) – Dictionary-based algorithm that forms the basis for many other algorithms ** [[Deflate]] – Combines LZ77 compression with Huffman coding, used by [[ZIP (file format)|ZIP]], [[gzip]], and [[Portable Network Graphics|PNG]] images ** [[Lempel–Ziv–Markov chain algorithm]] (LZMA) – Very high compression ratio, used by [[7zip]] and [[XZ Utils|xz]] ** [[Lempel–Ziv–Storer–Szymanski]] (LZSS) – Used by [[WinRAR]] in tandem with Huffman coding ** [[Lempel–Ziv–Welch]] (LZW) – Used by [[GIF]] images and Unix's <code>[[compress]]</code> utility * [[Prediction by partial matching]] (PPM) – Optimized for compressing [[plain text]] * [[Run-length encoding]] (RLE) – Simple scheme that provides good compression of data containing many runs of the same value
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