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2. Smallpdf.com - Wikipedia

   en.wikipedia.org/wiki/Smallpdf.com

   Smallpdf is a Swiss online web-based PDF software, founded in 2013. [2] It offers free version with limited features to compress, convert and edit PDF documents. [ 3 ] And its paid version offers advanced features like OCR, compress, and more [ 4 ] .

3. bzip2 - Wikipedia

   en.wikipedia.org/wiki/Bzip2

   bzip2 is a free and open-source file compression program that uses the Burrows–Wheeler algorithm.It only compresses single files and is not a file archiver.It relies on separate external utilities such as tar for tasks such as handling multiple files, and other tools for encryption, and archive splitting.

4. LHA (file format) - Wikipedia

   en.wikipedia.org/wiki/LHA_(file_format)

   These compression methods are created by PMarc, a CP/M archiver created by Miyo. The archive usually has a .PMA extension. pc1 PopCom compressed executable archive. Details unknown. pm0 No compression method is applied to the source data. pm1 8 KB sliding window, static huffman. Seldom generated, decompressor is reverse-engineered. [6] pm2

5. Data compression ratio - Wikipedia

   en.wikipedia.org/wiki/Data_compression_ratio

   Thus, a representation that compresses the storage size of a file from 10 MB to 2 MB yields a space saving of 1 - 2/10 = 0.8, often notated as a percentage, 80%. For signals of indefinite size, such as streaming audio and video, the compression ratio is defined in terms of uncompressed and compressed data rates instead of data sizes:

6. List of archive formats - Wikipedia

   en.wikipedia.org/wiki/List_of_archive_formats

   An open source, patent- and royalty-free compression format. The compression algorithm is a Burrows–Wheeler transform followed by a move-to-front transform and finally Huffman coding. .F, .?XF [e] Freeze/melt [3] QNX4, Unix-like and DOS: Old compressor for QNX4 OS. The compression algorithm is a modified LZSS, with an adaptive Huffman coding ...

7. Lempel–Ziv–Oberhumer - Wikipedia

   en.wikipedia.org/wiki/Lempel–Ziv–Oberhumer

   Allows the user to adjust the balance between compression ratio and compression speed, without affecting the speed of decompression; LZO supports overlapping compression and in-place decompression. As a block compression algorithm, it compresses and decompresses blocks of data. Block size must be the same for compression and decompression.