The archivers with the highest compression ratio would be KGB (which has been used to compress a 430 MB MS Office ISO image to fit on a floppy disk) and Uharc (a high compression multimedia archiver), but they're not necessarily the fastest. The compression will be lossless.
If you want to reduce the size via the bitrate (and thus the quality), I recommend this program:
MP3 Quality Modifier makes it really easy to change the bitrate of your MP3 music collection so that the filesize can be dramatically reduced. With this advantage it's possible to put more music on your MP3-player or just to save some disk space.
Even advanced tasks are possible: Downsampling, changing the used channels and so on. With the included presets it's simpler than ever before to manage all those settings.
Best of all is that - unlike other software - the ID3 tags (title, album pictures, etc.) will be completely retained without any effort!
Main features:
* Change MP3 quality with just a few clicks.
* Really easy and intuitive interface.
* Retain all ID3 tags with ease.
* Advanced options: detailed bitrate settings, sample frequency, etc.
* Quality comparison: compare created files with original ones.
* Multilingual: English, French, German, Italian, Portuguese, Spanish.
* Portable: extremely small, just one executable, no installation.
* Free of charge!
![Screenshot](../../I/static/images/4a7e6bd3d9c86ce804c41ac51e9664acb7cab41d613ee304a11941887da05dda.jpg)
All programs are freeware and portable.
And if you want to learn more about audio ripping and MP3, here's a very comprehensive tutorial:
Radified Guide to Ripping CD audio & MP3 Encoding
3I don't believe it is possible to compress 430M to <1.40M. Source? – Aaron Miller – 2013-06-10T20:02:34.697
2@AaronMiller Answered in 2009, user no longer exists... even links are broken now. Don't think he/she'll answer the source – woliveirajr – 2013-06-10T20:14:28.370
1@woliveirajr A fair point which I hadn't noticed. Thanks! – Aaron Miller – 2013-06-10T20:22:22.503
1
@AaronMiller I do know that it used the PAQ6 algorithm which is considered one of the very best to get the maximum compression ratio. The drawback is to get those ratios it can take GB of ram and potentially days to compress. A variant of PAQ consitantly wins the Calgary Challange with the current best compressing 3,141,622 of various types of files to 580,170 bytes of data (both payload and the program to decompress it). But that is still only a ratio of 18%, not the 0.2% the OP is claiming.
– Scott Chamberlain – 2014-03-16T15:07:40.683