Extract text from Amazon page number indexes (APNX)
To convert APNX Index files to another format, you need Amazon Kindle or other Data software.
To convert other file formats to the "E-Book Index File" file type, you need software like Amazon Kindle or a similar tool.
The .apnx file is an Amazon Page Number Index file. It is an auxiliary companion file used by Amazon Kindle devices and applications. Its primary use is to map arbitrary digital ebook locations to the exact page numbers found in the physical print edition of a book. This allows readers to reference real-world page numbers.
Typically, this file is managed automatically by Amazon Kindle software or ebook management tools like Calibre.
Users often encounter issues when they find an .apnx file on their device and mistake it for an actual ebook. The biggest limitation of this proprietary format is that it contains zero readable text. It only stores binary index data. Because it lacks content, standard online converters fail to process it, and users waste time trying to force it into reading software.
Because it is merely an index, converting an .apnx file to standard ebook formats like EPUB or PDF is impossible. If you need to view the mapping data, the best target formats are raw TXT or XML files, but this data is generally useless outside of the Kindle ecosystem.
This file format is difficult to open or convert because it is a closed, undocumented binary format designed exclusively for Amazon hardware. Often, only the original reading software can properly read the data in tandem with the primary ebook file. Just drag and drop your file to identify the format, view it, and convert it when possible. convert.guru can still identify the file format, inspect the file, and show text or internal content. If our analysis detects a supported underlying or embedded format, viewing or conversion may still be possible.
Convert.Guru analyzes your APNX file, detects the exact format, and lets you read the text inside.
Users also converted EA, AZW3, PHL, AZW, EPUB, MBP, PDF, SDR, PRNX, KFX and MOBI files.
If you want to convert APNX file to EPUB, PDF, MOBI, AZW, AZW3, KFX, PRC, LIT, OPF, CBZ, CBR or CB7, you can use Amazon Kindle or similar software from the "Page Number Mapping Index" category. In the File menu, look for Save As… or Export….
To convert FB2, MOBI, CBT, RTF, CB7, DOCX, DJVU, AZW, CBA, PDF, DOC or EPUB files to APNX, try Amazon Kindle or another comparable tool in the "Page Number Mapping Index" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our APNX converter.