| Name | Author | Version | Competition categories | Description |
| agiannis_image | Konstantinos Agiannis | Test 2, rapid | Color Transform + Predictor + Bit Shuffling + FSE | |
| agiannis_text | Konstantinos Agiannis | Test 1, rapid | Block Sorting + RLE + FPC | |
| archbox | Andrei | 1.0 | Test 1, rapid
Test 2, rapid Test 3, rapid |
|
| babylz | Sergey Melnikov | Test 4, rapid | Simple fast LZ-type compression with my improvement | |
| BCM | Ilya Muravyov | 2.00 alpha 3 | Test 1, balanced
Test 2, balanced Test 3, balanced |
BWT with Context Mixing |
| BMF | Dmitry Shkarin | 2.01 | Test 2, balanced
Test 2, hcr |
Standard image compression scheme, prediction + error context modeling |
| BWIC | Ziya Arnavut | Test 1, hcr
Test 2, hcr Test 3, hcr |
BWIC utilizes BWT, Inversion Coder, RLE0 and a Arithmetic Coder | |
| DURILCA | Dmitry Shkarin | 0.5 | Test 1, hcr | PPMonstr + preprocessing |
| DURILCA’base | Dmitry Shkarin | 0.5 | Test 3, hcr | PPMonstr + preprocessing |
| DURILCA’light | Dmitry Shkarin | 0.5 | Test 1, balanced | PPMd + preprocessing |
| EMMA | Marcio Pais | Test 2, hcr | ||
| guess | Sergei Soldatov | Test 2, rapid | ||
| HALIC-Balanced | Hakan Abbas | 0.4 | Test 2, balanced | Only one “Adaptive Estimator” and “Rice Encoder” |
| HALIC-Rapid | Hakan Abbas | 1.0b | Test 2, rapid | Only one “Adaptive Estimator” and “Rice Encoder” |
| hlx | Andreas Debski | Test 2, rapid | ||
| hrcm | Konstantin Zaborskikh | Test 4, hcr | Context mixing algorithms | |
| k5 | Frederic Langlet | 0.3 | Test 1, rapid
Test 1, balanced Test 1, hcr Test 2, rapid Test 2, balanced Test 3, rapid Test 3, balanced Test 3, hcr Test 4, rapid Test 4, balanced Test 4, hcr |
|
| KATY | Marcio Pais | Test 3, balanced | ||
| KharBlock | David Kharabadze | Test 4, rapid | Dynamic Huffman coding | |
| Kvick | Andreas Debski | Test 2, rapid | Linear prediction based on a block-wise LSM(OLS)-optimized prediction model + ANS coding | |
| lac | Qian Yijia | Test 1, balanced | ||
| LEA | Marcio Pais | Test 2, balanced | ||
| LILY | Marcio Pais | Test 3, hcr | ||
| LUA | Marcio Pais | Test 1, hcr | ||
| LUNA | Marcio Pais | Test 4, balanced | ||
| LZNV | Sebastian.LUPANE | 2.9207 | Test 1, rapid
Test 1, balanced Test 2, rapid Test 2, balanced Test 3, rapid Test 3, balanced |
LZFG + Advanced Static Huffman Coding |
| LZPM | Ilya Muravyov | 0.18 | Test 1, hcr
Test 2, balanced Test 3, hcr |
LZ77 with Arithmetic (Range) encoding and Optimal Parsing |
| lzuf2 | Gerald R. Tamayo | Test 1, balanced
Test 2, balanced Test 3, balanced |
||
| MCM | Mathieu Chartier | 0.85 | Test 1, balanced
Test 1, hcr Test 3, balanced Test 3, hcr |
LZP and CM + Dict/X86 filter + Alphabet reorder with different CM models for text vs binary data |
| Nakamichi ‘Dragoneye’ | Georgi Marinov a.k.a. Sanmayce | 2020-jul-20 | Test 1, hcr | LZSS with 1TB sliding window, greedy parsing, no entropy coding. |
| NINO | Marcio Pais | Test 4, hcr | ||
| Orz | Zhang Li | 1.6.2 | Test 1, balanced | |
| pgcm | Peter Thamm | 4 | Test 1, balanced
Test 3, balanced Test 4, balanced |
WRT + CM
filter + CM dictionary coder, CM |
| pglz | Peter Thamm | 3 | Test 1, rapid
Test 2, rapid Test 3, rapid Test 4, rapid |
WRT + entropy coding
linear transform + entropy coding filter + LZ pglz/zstd hybrid with data detection and preprocessing |
| PPMd | Dmitry Shkarin | mod. var. J, oct 16 2020 | Test 1, balanced
Test 3, balanced Test 4, balanced |
PPM with Information Inheritance |
| PPMonstr | Dmitry Shkarin | mod. var. J, oct 16 2020 | Test 1, hcr
Test 3, hcr Test 4, hcr |
Complicated version of PPMd, PPMd + SSE/TSE |
| sgcm | Peter Thamm | 2 | Test 1, hcr
Test 3, hcr Test 4, hcr |
WRT + CM
filter + CM dictionary coder, CM |
| SIMD_ZPAQ | Jiabing Fu | Test 3, hcr | ||
| tarcm | Konstantin Zaborskikh | Test 3, hcr | Context mixing+Deduplication+Delta Coding | |
| TBCM | Uwe Baier | Test 1, balanced
Test 2, balanced Test 3, hcr |
BWT Compression with Tunneling | |
| ULZ | Ilya Muravyov | Test 4, rapid | LZSS with Golomb Codes |
Reference compressors
| Name | Version | Competition categories |
| Zstd | 1.4.5 | Test 1, rapid
Test 1, balanced Test 1, hcr Test 3, rapid Test 3, balanced Test 4, rapid Test 4, balanced Test 4, hcr |
| brotli | 1.0.0 | Test 1, rapid
Test 3, rapid |
| zlib | 1.2.11 | Test 4, rapid
Test 4, balanced Test 4, hcr |
| GLZA | 0.11.3 | Test 1, hcr |
| gzip_libdeflate | 1.6 | Test 1, rapid
Test 2, rapid Test 3, rapid |
| nanozip | 0.09 | Test 1, rapid
Test 2, hcr Test 3, rapid |
| MCM | 0.84 | Test 1, balanced
Test 1, hcr |
| PPMd | var. J, may 10 2006 | Test 1, balanced
Test 3, balanced |
| Bzip2 | 1.0.8, 13-jul-2019 | Test 1, balanced
Test 3, balanced |
| PPMonstr | var. J, feb 16 2006 | Test 1, hcr
Test 3, hcr |
| drt | lpaq9m | Feb. 20, 2009 | Test 1, hcr |
| ZPAQ | 7.15, aug 17 2016 | Test 1, hcr
Test 3, hcr Test 4, balanced Test 4, hcr |
| QLIC2 | ver. 2 | Test 2, rapid |
| IZ | 0.1 | Test 2, rapid |
| zcm | 0.93 | Test 2, balanced
Test 2, hcr |
| JPEG-LS | 1 | Test 2, balanced |
| JPEG XL | 0.1.0 | Test 2, balanced
Test 2, hcr |
| PIK | May 29, 2019 | Test 2, balanced |
| lz4 | 1.9.3 | Test 4, rapid |