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Old 06-01-2010, 04:28 PM   #1
Anarel
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[Old Thread] What's an OPF file?

When I convert some of my books, or just edit the metadata of them, in the folder I get an OPF file, along with the cover image. What is the opf file for? I've been deleting them...
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Old 06-01-2010, 05:46 PM   #2
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Its the metadata for that book. I believe it's created so if you want to import those epubs into a different program, you can do so with all your nice metadata intact.

You can disable this behaviour if you want. Under Prefererences-->Add/Save-->(TAB)Saving Books. There is a checkbox for "Save Metadata in OPF file".


EDIT: At least for epubs, I believe the metadata is also stored within the actual epub, so FOR EPUBS this OPF file might be redundant. But not all ebook formats support saving extensive metadata inline (think TXT, RTF, HTML, etc). I could be wrong about this though, so someone else pipe in.

Last edited by Stinger; 06-01-2010 at 05:48 PM.
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Old 06-01-2010, 06:02 PM   #3
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Quote:
Originally Posted by Stinger View Post
Its the metadata for that book. I believe it's created so if you want to import those epubs into a different program, you can do so with all your nice metadata intact.
It's also used when adding the book to Calibre. If that file exists when you try to import into Calibre, it will override any other metadata in the file or in the filename. If you want to give a book to a friend who's also using Calibre, give them the opf file too.

Quote:
At least for epubs, I believe the metadata is also stored within the actual epub
Yes, it's in the content.opf file inside the EPUB.
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Old 06-01-2010, 08:17 PM   #4
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.opf is open packaging format. It is a cross platform specification to try and maintain some consistency between different publishers etc. I think
http://www.idpf.org/2007/opf/OPF_2.0_final_spec.html
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Old 11-21-2011, 04:23 AM   #5
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I always wondered what it was, thanks for the info.
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Old 11-21-2011, 09:32 AM   #6
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Calibre stores an opf file with every book in its library, changing it every time the metadata for the book is changed. The files are used by the restore database function to recreate calibre's database (metadata.db) in the case that the db has become corrupted.

You cannot turn off this behavior. You can, of course, delete the files, but by doing so you are potentially shooting yourself in the foot by depriving yourself of a way to recover your library if something goes wrong with the db.
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Old 08-14-2012, 08:23 AM   #7
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I know it's an old thread.

Thanks for the question and the answers - it also helped with with another question.
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