OPF File Type

- The quick facts

What are OPF files and how to open them

Are you having problems opening an OPF file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is an OPF file?

OPF files have multiple uses, and EPUB Package Document Metadata is one of them.

EPUB Package Document Metadata

We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

How to open OPF files

Important: Different programs may use files with the OPF file extension for different purposes, so unless you are sure which format your OPF file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested 10 different OPF openers which you will find listed below.

Last updated: June 29, 2022

All known file formats using extension .OPF

While EPUB Package Document Metadata is a popular type of OPF-file, we know of 5 different uses of the .OPF extension. Different software may use files with the same extension for different types of data.

Open Packaging Format E-book Data

OPF stands for Open Packaging Format. The Open Packaging Format is a standard that is a part of the EPUB eBook specification. The OPF files store information for an associated eBook, including the title of the eBook, the eBook language, creator, reading order, and book ID. The OPF file is included in the EPUB archive to specify the metadata of the associated eBook. The OPF files are saved in XML format.

While we have not verified the apps ourselves yet, our users have suggested 10 different OPF openers which you will find listed below.

More file formats using the OPF extension

Through our research of OPF files, we know that the following formats exist. However, we have not yet analyzed them in detail.

  • Obsidium Project File
  • OEB Package Format EBook
  • OmniPass Encrypted

Various apps that use files with this extension

These apps are known to open certain types of OPF files. Remember, different programs may use OPF files for different purposes, so you may need to try out a few of them to be able to open your specific file.

FlipViewerFlipViewerUser submitted
Mobipocket CreatorMobipocket CreatorUser submitted
E-book viewerE-book viewerUser submitted
KEPServerExKEPServerExUser submitted
FlipAlbum ProFlipAlbum ProUser submitted
Adobe PhotoshopAdobe PhotoshopUser submitted
FlipAlbumFlipAlbumUser submitted
CalibreCalibreUser submitted
Book Wizard ReaderBook Wizard ReaderUser submitted
SIMATIC NET SoftwareSIMATIC NET SoftwareUser submitted

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about OPF file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.