Quote:
Originally Posted by user_none
TXTZ is just a ZIP archive with TXT, images and a metadata OPF file in it.
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If I can go slightly off topic - what readers/programs use this format? I saw it appear in the list, and I assume the Calibre reader reads it, but where did it come from? I also was going by some quick Googling that indicated it was just a compressed txt file.
If it's also got a copy of the image and opf file, I wonder how much saving of space he'll get? That was the OP's purpose, but since Calibre already has the image in the library as cover.jpg, would converting a txt to txtz create a second stored copy of the image in the txtz file that duplicated the cover.jpg image already stored?
The jpg format is already compressed, so it won't get smaller inside the zip. It just strikes me as a lot of work to save a few pennies worth of storage capacity.
Edit: I realized I could answer the latter question myself. Yes, it duplicates/adds the cover/opf, but I still got about 50% file size reduction as compared to the uncompressed txt format. For my entire library, with many pdfs and epubs, it wouldn't reduce the size by much. For a txt only library, it might be worth it if your reader read that format.