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Does anyone have any recommendation or procedures for repairing a corrupt PDF? When I open the file I get "There was an error opening this document. the file is damaged and cannot be repaired." There seems to be a myriad of tools out there but none that I could describe as reputable. Are there any opensource linux based solutions for this possibly?

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Opensource PDF tools tend to be pretty crappy, I'm afraid. What are you using? –  Satanicpuppy May 3 '11 at 14:38
Also see: superuser.com/questions/166999/… –  slhck May 3 '11 at 14:39
didnt like the look of any of the tools as they looked like the myriad of "Registry Cleaners" out there that are useless. Have been trying Adobe Pro and have just started looking if Ghostscript or PDFForge have any repair switches. –  Tim Alexander May 3 '11 at 14:48
Ghostscript is okay, but it's certainly not better than Acrobat. It's completely bare bones. –  Satanicpuppy May 3 '11 at 18:41
@Satanicpuppy I disagree :: I use ghostscript to rebuild damaged or low-quality pdfs quite often and it performs very well. –  Eddie B Feb 5 '13 at 20:16

3 Answers 3

up vote 40 down vote accepted

Ghostscript will repair your corrupted PDF automatically... if it can open it in the first place (that is, if it is not damaged beyond repair). But afterwards you'll still need to double-check the result...

On Linux, try this command:

 gs \
  -o repaired.pdf \
  -sDEVICE=pdfwrite \
  -dPDFSETTINGS=/prepress \

On Windows, try this one:

 gswin32c.exe ^
  -o repaired.pdf ^
  -sDEVICE=pdfwrite ^
  -dPDFSETTINGS=/prepress ^
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Ghostscript does a fantastic job of rendering pdfs ... I regularly use gs to rebuild pdfs to improve font quality. –  Eddie B Feb 5 '13 at 20:14

I had a corrupted PDF file, print.pdf , that Ghostscript couldn't open, but the usual graphical Linux PDF viewers (Okular, Evince) opened fine. (In my case, the file had garbage at the start instead of a PDF header, when opened in a hex editor.)

These PDF viewers use Poppler as a back-end PDF renderer. So you can repair the PDF using Poppler's command-line tools. In Ubuntu these are in the poppler-utils package. I used:

pdftocairo -pdf print.pdf print_repaired.pdf

which generated a PDF file with correct headers, which tools like Ghostscript now accepted.

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+1 this read my Quartz generated PDF without complaints, and immediately started generating output. Ghostscript, Adobe Acrobat Pro and others insisted on rebuilding my 120GB pdf first. –  Orwellophile Dec 14 '13 at 14:17
This didn't work for at least one weird PDF I came across, but it seems like a good start. –  Bepetersn Nov 11 '14 at 20:00
Works perfectly on a PDF on which Ghostscript wanted to remove some arbitrary elements on pages. –  Andrea Lazzarotto Nov 22 '14 at 16:14

I had a corrupted pdf file, because the php file used to download it echoed some errors (in HTML) and NUL characters at the end.

The solution was to open the pdf with Notepad++ and remove all text after the line

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had same, Adobe Reader didn't open but native Mac, Chrome and Firefox PDF plugin displayed PDF file fine. Reason was also extra "NUL" at last line added during the upload. –  Tilo Apr 8 '14 at 19:23

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