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gzip – single-file/stream lossless data compression utility

gzip provides the standard GNU file compression utilities, which are also the default compression tools for Debian.

pixz is a parallel, indexed xz compressor. pixz produces a collection of smaller blocks which makes random access to the original data possible.

lzop is a file compressor which is very similar to gzip. lzop uses the LZO data compression library for compression services.

pigz is a fully functional replacement for gzip that uses multiple processors and multiple cores to the hilt when compressing data.

Brotli is a generic-purpose lossless compression algorithm that compresses data.

Zstandard is a fast compression algorithm, providing high compression ratios.

LZ4 is lossless compression algorithm, providing compression speed > 500 MB/s per core (>0.15 Bytes/cycle).

jpegoptim is a utility to optimize jpeg files. Both lossless and lossy optimization are available from this free and open source tool.

Pngcrush is a free and open source optimizer for PNG (Portable Network Graphics) files. It is a command-line tool.

Zopfli Compression Algorithm is a compression library programmed in C to perform very good, but slow, deflate or zlib compression.