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Hello there everybody.

My question should be rather simple for "insiders" (or I hope so at least), so here is the matter: as far as I know and understand, 7zip is currently the best lossless compression software for everyday purposes as it -generally speaking- grants the best possible compression ratio nowadays... or is it?

Ok now, assuming my premise is correct, my most specific question is this: does 7-zip always grants the best lossless compressing ratio or in specific circumstances (i.e. compressing images rather than office documents, etc.) there are "better aimed solutions"?

To be more precise, I'm interested in compressing what I have to send by email the more often, that is:

  • PDF documents
  • images (90% of which JPEGs)
  • although rarely, binaries (executables, etc.)

Do you know any software that grants better compression ratio than 7-zip for those specific cases?

I'd greatly appreciate advices based upon statistical or technical information (i.e. compression ratio comparison, etc.). Thank you in advance.

P.S. I know that JPG is already a compressed format so it is difficult to get it to shrink more and, moreover, often PDF documents are indeed JPEGs... Clearly, I'm not so wishful of having to use many software if it is not worth the effort and, in that case, I'll go on using only 7-zip for everything.

  • well you are asking for a tool with better compression ration than 7zip isn't it? – Aditya ultra Jul 9 '15 at 7:59
  • In my experience, 7-zip has been better than other compression software. It also gives you a choice between different compression algorithms, so you can test different ones for different data types. If your data is too large for emails, consider either splitting the archive (7-zip supports that as well), or using an SFTP service (like Bitvise or TeamViewer) to transfer your files – Tymric Jul 9 '15 at 17:51
  • 7zip isn't the best compressor, but it is the best balance compressor. Is time a corcern for you? Do you want another program that saves spaces, but takes an hour(depending on size of input) or more to do its job? – cybernard Jul 17 '15 at 4:53
  • @cybernard : yeah, of curse time do matter... but... what d'ya have in store? ;-) If the final result really make a BIG difference on compressed size then maybe I could decide to wait for it... otherwise, as I said, if it's not worth the effort I'll stay with 7-zip. – danicotra Jul 17 '15 at 19:22
  • FreeArc and PeaZip. WinRAR is also good. Note: For user sanity most compression programs are only set to level 2-4. If you adjust the settings to 9 (usually the MAX), you will achieve better compression. There is another program, I forgot the name, but after 16 hours it still had 1-2 days left on a 40gb hard drive image. I was forced to abort. – cybernard Jul 18 '15 at 0:58

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