File Extension Database

Open OPF File

An OPF file, or Open Packaging Format file, is an XML file that provides information about an e-book's structure and metadata. As an essential component of an electronic book, the OPF file lists the title, creator, language, reading order, and describes the relationship between the content files and their metadata. In this article, we will discuss possible formats and ways to open and use files with OPF file extensions.

EPUB E-Books

One of the primary uses of OPF files is as a part of the EPUB e-book standard. EPUB stands for Electronic Publication and is a widely-used open e-book standard by International Digital Publishing Forum ( The OPF plays a key role in EPUB e-books by defining the structure and metadata that ensure proper display on different e-reading devices.

To open and use files with OPF file extensions in an EPUB context, you can utilize software like Calibre, Sigil or Adobe Digital Editions. These tools typically allow users to not only read e-books but also edit or convert them into other formats.

Creating EPUB E-Books

If you're an author or publisher and would like to create your e-book, OPF files are essential. They organize the content, images, and styles of your e-book. You can use various e-book creation tools, such as Calibre or XML Notepad, to manually edit or automatically generate an OPF file for your EPUB e-book.

Although creating an OPF file requires knowledge of the XML markup, using e-book editing software simplifies the process. The assistance of a good guide or tutorial on creating e-books can also help you understand and create OPF files more easily, like this one from IBM Developer Works.

OPF Files in Other Contexts

While the primary use of OPF files is in e-books, there are other contexts where they can be found. These situations are less-common, and it is essential to understand the file's purpose in your specific context before attempting to open or use the file. Some examples include FLIPORT e-books, systems like EnergyHub which use the OPF format for internal data handling, or other custom or industry-specific applications.

OPF File Important Information

In conclusion, OPF files provide crucial information for reading, editing, and managing e-books in the EPUB format. Knowing how to work with OPF files is essential for authors, publishers, and even readers looking to customize their e-book experience. As a widely-adopted open standard, there are many resources available for creating, editing, and converting OPF files and EPUB e-books. Keep in mind that, in certain cases, you may encounter OPF files in other contexts, so understanding their specific purpose in your situation is imperative for avoiding confusion and errors.

Typical OPF application file locations:

  • "C:\Program Files (x86)\\Mobipocket Creator\creator.exe" "%1"

Frequently used application names to open OPF files:


Frequently associated Windows objects:

  • opffile

How Can I Open OPF File on Windows

How Can I Open OPF File on Mac OS

How Can I Open OPF File on Android

If you downloaded a OPF file on Android device you can open it by following steps below:

How to Open OPF File on iPhone or iPad

To open OPF File on iOS device follow steps below:

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OPF file article translations

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