Several developers have hosted open-source scripts on GitHub specifically for this purpose. These tools typically work by extracting the SQLite database within the .jwpub package and reformatting the HTML content into a standard EPUB structure.
: A widely-used, open standard for eBooks that can be read on many devices and platforms. jwpub to epub converter 2021
: As the JW Library app updated its encryption or database structure, many older converters from early 2021 became obsolete by the end of the year. Official Sources Several developers have hosted open-source scripts on GitHub
WT_202109.jwpub (1.2 MB encrypted) Process: Ran jwpub2epub on Windows 10, Python 3.9. Output: WT_202109.epub (3.8 MB uncompressed) Verification: Validated with EPUBCheck 4.2.4 → 3 warnings (missing fallback fonts). Device test: Successfully opened in Apple Books, Kindle for PC, and Calibre. Kindle for PC