Extract text from CAJ files
To convert your CAJ file to another format, you need CAJViewer or other E-Book software.
To convert other file formats to the "Digital Publication" file type, you need software like CAJViewer or a similar tool.
The .CAJ file extension represents the Chinese Academic Journal format, the standard proprietary container used by the China National Knowledge Infrastructure (CNKI). It is the dominant format for distributing millions of academic papers, dissertations, and conference proceedings from Chinese universities. While structurally similar to PDF, .CAJ files are encrypted and encoded specifically for the CNKI ecosystem.
The main drawback for users is proprietary lock-in. .CAJ files cannot be opened by standard PDF readers like Adobe Acrobat, web browsers, or mobile devices without specific third-party apps. Users must install CAJViewer, which often presents language barriers (Chinese-only interfaces) and limited functionality on non-Windows operating systems. Furthermore, text selection for copy-pasting into translation tools or citation managers is notoriously difficult due to DRM restrictions and custom character encodings.
To bypass these limitations, the best practice is converting .CAJ to PDF. This ensures universal compatibility for archiving, printing, and viewing on any device. For researchers needing to translate content or extract data, converting to DOCX (Word) or plain TXT is recommended, as it strips away the restrictive container, allowing optical character recognition (OCR) tools to process the text. Note: A very small percentage of .CAJ files may be sheet metal job files created by Lantek CAD/CAM software; these are vector-based and require conversion to DXF or DWG.
Convert.Guru analyzes your CAJ file, detects the exact format, and lets you read the text inside.
Users also converted PDF, CAG, NCM, OFD, EDDX, XAPK, MPKG, PDZ, CRDOWNLOAD, XMIND, EXE, RIS and XDF files.
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 CAJ converter.