7-zip Compression Comparison

I wanted to test different Compression Methods using the OpenSource program called 7-Zip

Movie in OGM format - File Size - 182,226,467 - compression was performed in ULTRA mode

• 7z_LZMA - 179,221,782 - 98.3511% the original
• 7z_PPMd - 178,680,904 - 98.0543% the original
• 7z_BZip2 - 179,222,400 - 98.3515% the original
• BZip2_BZip2 - 179,222,242 - 98.3514% the original
• GZip_Deflate - 179,391,261 - 98.4441% the original
• Tar_Store - 182,228,480 - 100.0011% the original
• Zip_Deflate - 179,391,371 - 98.4442% the original
• Zip_Deflate64 - 179,339,319 - 98.4156% the original
• Zip_BZip2 - 179,222,402 - 98.3515% the original

Document in PDF format - File Size - 10,255,019 - compression was performed in ULTRA mode

• 7z_LZMA - 10,190,616 - 99.3720% the original
• 7z_PPMd - 9,946,240 - 96.9890% the original
• 7z_BZip2 - 10,123,363 - 98.7162% the original
• BZip2_BZip2 - 10,123,253 - 98.7151% the original
• GZip_Deflate - 10,200,015 - 99.4636% the original
• Tar_Store - 10,256,896 - 100.0183% the original
• Zip_Deflate - 10,200,101 - 99.4645% the original
• Zip_Deflate64 - 10,199,035 - 99.4541% the original
• Zip_BZip2 - 10,123,365 - 98.7162% the original

Music in MP3 format - File Size - 3,300,238 - compression was performed in ULTRA mode

• 7z_LZMA - 3,230,749 - 97.8944% the original
• 7z_PPMd - 3,220,591 - 97.5866% the original
• 7z_BZip2 - 3,220,601 - 97.5869% the original
• BZip2_BZip2 - 3,220,491 - 97.5836% the original
• GZip_Deflate - 3,235,428 - 98.0362% the original
• Tar_Store - 3,301,888 - 100.0500% the original
• Zip_Deflate - 3,235,514 - 98.0388% the original
• Zip_Deflate64 - 3,232,528 - 97.9483% the original
• Zip_BZip2 - 3,220,603 - 97.5870% the original

Document in Microsoft Word format - File Size - 1,077,248 - compression was performed in ULTRA mode

• 7z_LZMA - 19,466 - 1.8070% the original
• 7z_PPMd - 30,865 - 2.8652% the original
• 7z_BZip2 - 38,600 - 3.5832% the original
• BZip2_BZip2 - 38,492 - 3.5732% the original
• GZip_Deflate - 45,134 - 4.1898% the original
• Tar_Store - 1,078,784 - 100.1426% the original
• Zip_Deflate - 45,220 - 4.1977% the original
• Zip_Deflate64 - 41,042 - 3.8099% the original
• Zip_BZip2 - 38,604 - 3.5836% the original

Spreadsheet in Microsoft Excel format - File Size - 2,339,840 - compression was performed in ULTRA mode

• 7z_LZMA - 451,161 - 19.2817% the original
• 7z_PPMd - 550,670 - 23.5345% the original
• 7z_BZip2 - 525,419 - 22.4553% the original
• BZip2_BZip2 - 525,282 - 22.4495% the original
• GZip_Deflate - 702,938 - 30.0421% the original
• Tar_Store - 2,341,376 - 100.0656% the original
• Zip_Deflate - 703,038 - 30.0464% the original
• Zip_Deflate64 - 680,687 - 29.0912% the original
• Zip_BZip2 - 525,422 - 22.4555% the original

Basically dont use the Tar format at all.
7z_LZMA looked to have the best average compression method it seems.

 

Exactly...but I wanted to include it for completeness