Thread: Add ZIP and RAR formats to book
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Old 08-08-2018, 11:56 PM   #4
DNSB
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Quote:
Originally Posted by BetterRed View Post
@mysernameisalrea - because an ePub is already compressed (zipped) - except for the mimetype file - compressing an ePub won't buy you much disk space.

BR
The last time I tested compressing 14 epubs I was sending back to the author after doing some cleanup and proofreading, the total savings on 14 separate compressed files was ~13KB. If I compressed all 14 files into a single archive, I got the following results using 7Zip:
Code:
Zip (Ultra, deflate64) 10,219,633 bytes
7z (Ultra, lzma2)       9,848,355 bytes
Zip (store only)       10,251,096 bytes
If I didn't use 7Zip's maximum compression settings, the savings were even less. A couple of cases such as zip format, normal compression, LZMA actually used more space than the store only option.
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