I came up with a straightforward workflow to convert PDFs to Kindle format which also bypasses Amazon's service. Note: this works best for image based/ or text + image based pdfs or if you want to preserve PDF formats.
PDF to Kindle Workflow:
1) Use PDF2LRF to input a PDF and output to a .ZIP file filled with PNG files. (I have to use PDF2LRF in command line format to accomplish this).
Link: http://www.mobileread.com/forums/showthread.php?t=13135 (download the command line program). Use command:
" pdf2lrf -i INPUT_PDF_FILENAME.pdf -o OUTPUT_PDF_FILENAME.zip " (which generates a zip file of PNG images from PDF)
2) Then use the program that jbenny posted (PNG2PDF) to generate a PDF file in commandline from the Zip files.
LINK: http://www.mobileread.com/forums/showthread.php?t=13135&page=18 (scroll down and download the file PNG2PDF.zip) Type this command in command line prompt:
" png2pdf OUTPUT_PDF_FILENAME.zip "
This generates a file called: OUTPUT_PDF_FILENAME_png.PDF
3) Afterwards, run Mobipocket Creator to import PDF file and output to .PRC format which is readable on Kindle.
Download link: http://www.mobipocket.com/en/DownloadSoft/ProductDetailsCreator.asp.
Use option: Import PDF file: OUTPUT_PDF_FILENAME_png.PDF in Mobipocket Creator program (free), then after setting the Metadata, click Publish, to generate PRC file.
4) Move the generated .PRC file to your Kindle and enjoy it.
Note: you can fiddle with the PDF2LRF settings although the default settings worked pretty well.
Note: The advantage of this is I don't have to email the file to Amazon at all to get it converted and readable on kindle! (Since Gmail's 20 meg limit which I find quite limiting). And best of all the output is split nicely with high contrast, 2 pages/ landscape rotated which makes it as readable as on my Sony device compared to Amazon's default PDF conversion.
Summary: PDF -> PDF2LRF -> PNG2PDF -> MobiPocket Creator -> Kindle.
PDF2LRF download link is unavailable at present, but the best eBook converter and manager, Calibre, can help you. Calibre is a freeware which can convert e-books from format to format. It supports following input formats: CBZ, CBR, CBC, CHM, EPUB, FB2, HTML, LIT, LRF, MOBI, ODT, PDF, PRC, PDB, PML, RB, RTF, SNB, TCR, TXT. The output formats: EPUB, FB2, OEB, LIT, LRF, MOBI, PDB, PML, RB, PDF, SNB, TCR, TXT.
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