cpdf -decompress in.pdf -o out.pdf
cpdf -compress in.pdf -o out.pdf
cpdf -squeeze in.pdf [-squeeze-log-to <filename>] [-squeeze-no-recompress] [-squeeze-no-pagedata] -o out.pdf
Cpdf provides facilities for decompressing and compressing PDF streams, and for losslessly reprocessing the whole file to ‘squeeze’ it. For lossy recompression of images within a PDF, see Chapter 13.
To decompress the streams in a PDF file, for instance to manually inspect the PDF, use:
cpdf -decompress in.pdf -o out.pdf
If Cpdf finds a compression type it can’t cope with, the stream is left compressed. When using -decompress, object streams are not compressed. It may be easier for manual inspection to also remove object streams, by adding the -no-preserve-objstm option to the command.
To compress the streams in a PDF file, use:
cpdf -compress in.pdf -o out.pdf
Cpdf compresses any streams which have no compression using the FlateDecode method, with the exception of Metadata streams, which are left uncompressed.
To squeeze a PDF file, reducing its size by an average of about twenty percent (though sometimes not at all), use:
cpdf -squeeze in.pdf -o out.pdf
Adding -squeeze to the command line when using another operation will squeeze the file or files upon output.
The -squeeze operation writes some information about the squeezing process to standard output. The squeezing process involves several processes which losslessly attempt to reduce the file size. It is slow, so should not be used without thought.
$ ./cpdf -squeeze in.pdf -o out.pdf Initial file size is 238169 bytes Beginning squeeze: 123847 objects Squeezing... Down to 114860 objects Squeezing... Down to 114842 objects Squeezing page data Recompressing document Final file size is 187200 bytes, 78.60% of original.
The -squeeze-log-to <filename> option writes the log to the given file instead of to standard output. Log content is appended to the end of the log file, preserving existing contents.
The option -squeeze-no-pagedata avoids the reprocessing of page data, which avoids problems in case of malformed files, and makes the process much faster at the cost of a little less compression. The option -squeeze-no-recompress is deprecated as of version 2.6 and has no effect.