Convert LRF to PDF for Free
LRF format is a format which can be recognized on Sony eReaders. LRF is a format that is not often used on eBook market. The most popular eReaders, such as iPad, NOOK, Kindle, etc., can not support LRF format. Compared with LRF, PDF is a more common format which can be read on almost all popular eReader devices.
The article here is about how to convert LRF to PDF free. Hope it can be helpful for you.
Recommendation: PDF Converter can help you convert PDF to Image, ePub, TXT, HTML, and so on.
Convert LRF to PDF with Calibre

If you own an ebook (electronic book) reader, or just feel like reading ebooks on your desktop or netbook, Calibre will help keep them organized. Calibre is a free and open source e-book library management application. It can convert from a huge number of formats to a huge number of formats. It can rescale all font sizes, ensuring the output e-book is readable no matter what font sizes the input document uses. It can automatically detect/create book structure, like chapters and Table of Contents. It can insert the book metadata into a "Book Jacket" at the start of the book.
Supported input formats: CBZ, CBR, CBC, CHM, EPUB, FB2, HTML, LIT, LRF, MOBI, ODT, PDF, PRC, PDB, PML, RB, RTF, TCR, TXT.
Supported output formats: ePUB, FB2, OEB, LIT, LRF, MOBI, PDB, PML, RB, PDF, TCR, TXT.
Requirements: Mac OS X, Windows 7, Windows Vista, Linux, Windows XP.
Pros: Convert, import and read your ebooks easily; Clear interface.
Cons: RSS support isn't brilliant.
Convert LRF to PDF with Hamster 
Hamster Free eBook Converter is a handy conversion tool with support for all popular ebook readers and more than 200 devices. For those of you who like reading on electronic devices – ebook readers, mobile phones, tablets and so on – converting ebooks from one format to another, depending on the device you’re going to use, can be a pain. Hamster Free eBook Converter makes the whole process a lot easier: just import the books, select the target device and format, and click the Convert button.
Supported input formats: TXT, EPUB, FB2, OEB, LIT, LRF, MOBI, HTMLZ, PDB, RB, PDF, TXTZ.
Supported output formats: TXT, ePUB, FB2, OEB, LIT, LRF, MOBI, HTMLZ, PDB, RB, PDF, TXTZ.
Requirements: Windows XP, Windows Vista, Windows 7.
Pros: Nicely designed interface. Support for drag and drop. Works with most popular ebook formats. Support for more than 200 devices.
Cons: Conversions are not always successful. No advanced configuration options.
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