Not only are you able to combine PDF files, but you're also able to combine Word, Excel, PowerPoint, and Publisher files just to name a few. To compile more than one document into a single PDF file, use the Create PDF From Multiple Files function available in Adobe Acrobat 9 Pro. This article is based on legacy software. (Archives) Adobe Acrobat 9 Pro: Creating a PDF: Multiple Sources

(Archives) Adobe Acrobat 9 Pro: Creating a PDF: Multiple Sources.

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This still has the problem that it doesn't always catch changes in generated font names. with GNU diff 2.7: diff -brief -I xap: -I xapMM: -I /CreationDate -I /BaseFont -I /ID -binary -text anti-aliasing differences) then use tiffinfo to count the total number of pixels and you can then generate a percentage difference value.īy the way for anyone doing simple PDF comparison where the structure hasn't changed it is possible to use command line diff and ignore certain patterns, e.g. If you are happy to have a small amount of content change (e.g. Use tiffcmp -l and count the number of lines of output to find any differences. To compare the generated TIFF files I found GNU tiffcmp (for windows part of GnuWin32 tiff) and tiffinfo did a good job. To generate images from PDF you can use Adobe PDF Library or the solution suggested at Best way to convert pdf files to tiff files. I think your best approach would be to convert the PDF to images at a decent resolution and than do an image compare. $ composite front01.png back01.png result01.png # do this for all pairs of images $ convert -density 150x150 -transparent white +antialias 2.pdf front%02d.png

Here's how our script invokes the utilities (note that ImageMagick uses GhostScript behind the scenes to do the PDF->PNG conversion): $ convert -density 150x150 -fill red -opaque black +antialias 1.pdf back%02d.png I've been looking for a tool which would do the same on PDF/PostScript level.

only works well for black-and-white text and diagrams.great for finding small differences in layout.any PNG-capable image viewer for reviewing the result.inotify for synchronizing parallel processes.ImageMagick for coloring, transparency and overlay.GhostScript for PDF-to-bitmap conversion.runs conversion/coloring and overlaying in parallel on multiple cores.overlays each page from PDF 2 on top of the corresponding page from PDF 1.

changes white to transparent on pages of PDF 2.

converts all pages on two PDFs to bitmaps.

Compare two pdf files acrobat 9