K2pdfopt optimizes PDF/DJVU files for mobile e-readers (e.g. the Kindle) and smartphones. It works well on multi-column PDF/DJVU files and can re-flow text even on scanned PDF files. It can also be used as a general PDF copying/cropping/re-sizing/OCR-ing manipulation tool. It can generate native or bitmapped PDF output, with an optional OCR layer. There are downloads for MS Windows, Mac OSX, and Linux. The MS Windows version has an integrated GUI. K2pdfopt is open source.
MS-Windows GUI (can also be used in
Linux using Wine)
Home page: https://willus.com/k2pdfopt
Alternate site: https://willus.org/k2pdfopt
How to/Help: https://willus.com/archive/k2pdfopt/help
Alternative GUIs for k2pdfopt: https://willus.com/k2pdfopt/contrib
(Thank you to MR users
thomass and
wangminh12 for starting the original k2pdfopt threads which were merged into this one.)