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Old 12-15-2015, 09:54 PM   #14
eschwartz
Ex-Helpdesk Junkie
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Location: The Beaten Path, USA, Roundworld, This Side of Infinity
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RAR/7Z is irrelevant, since they compress with an incompatible compression algorithm.

zip compressors need to be played with until they put the mimetype first, in addition to not doing something stupid and compressing it (which should actually lead to it becoming larger).

...

Didn't I mention advzip? It can recompress zipfiles with the zopfli algorithm, and it is confirmed to be safe to use on existing valid EPUBs.

Last edited by eschwartz; 12-15-2015 at 09:58 PM.
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