.OPF File Extension

There are 3 file types use the .OPF file extension:

  1. FlipAlbum File
  2. Open Packaging Format File
  3. FlipViewer FlipBook File

1. FlipAlbum File

FlipAlbum File
  • Developer E-Book Systems
  • Popularity
    3.8 (15 votes)
  • Category Misc Files
  • Format Binary

Digital photo album created by FlipAlbum, a program that organizes images into picture albums; stores the album structure, appearance settings, and references to image files; can be viewed with 3D page-flipping effects.

FlipAlbum photo albums are commonly used for sharing pictures with friends and family. Professional photographers also used them for arranging pictures for clients.

OPF files are saved in E-Book Systems' proprietary FlipAlbum XML format, and should not be confused with the Open Packaging Format (OPF) standard.

NOTE: FlipAlbum has been discontinued and is no longer available for download.

Software's name License Platforms
E-Book Systems FlipAlbum E-Book Systems FlipAlbum MacWindows

Updated: July 7, 2016

2. Open Packaging Format File

Open Packaging Format File
  • Developer IDPF
  • Popularity
    3.6 (9 votes)
  • Category eBook Files
  • Format XML

File formatted according to the Open Packaging Format (OPF) standard, which is part of the EPUB eBook specification; stores eBook information such as the title, language, book ID, creator, reading order, and display formatting; used as part of an .EPUB archive to specify eBook metadata.

OPF files are saved in an XML format. The Open Packaging Format standard also requires a second .NCX XML file that stores the table of contents for the EPUB eBook.

Software's name License Platforms
Adobe Digital Editions Adobe Digital Editions Freeware AndroidiOSMacWindows
Adobe InDesign Adobe InDesign Commercial MacWindows
Calibre Calibre Open Source LinuxMacWindows
Geometer Plus FBReader Geometer Plus FBReader Freeware AndroidiOSLinuxMacWindows
KDE Okular KDE Okular Open Source LinuxMacWindows

Updated: April 9, 2010

3. FlipViewer FlipBook File

FlipViewer FlipBook File
  • Developer E-Book Systems
  • Popularity
    3.4 (14 votes)
  • Category Data Files
  • Format XML

FlipBook, such as a digital magazine or other publication that can be read with FlipViewer; saved in the OEB Package Format (OPF) which is formatted in XML; includes metadata that describes the content and a list of pages, images, and text referenced by the publication.

Because OPF files are formatted in XML, they can be created and edited with a basic text editor.

Software's name License Platforms
E-Book Systems FlipViewer E-Book Systems FlipViewer Windows
E-Book Systems Mac FlipViewer E-Book Systems Mac FlipViewer Mac

Updated: September 11, 2018

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