How to repair PDF's corrupted XREF table and stream lengths

Want to know how to repair PDF corrupted XREF table and stream lengths with command line? Then, please do not hesitate to

VeryPDF PDF Toolbox Command Line, which is a great PDF processing tool in Windows system, is able to merge, split, encrypt, fill PDF form, edit PDF description information, and optimize PDF. This command line application has many flexible options to implement various functions. To know more, just visit homepage of VeryPDF PDF Toolbox Command Line.

About XREF table and stream length

XREF tables are part of the original PDF file specification and one of the features which gives the PDF file format its flexibility. If you open a PDF file in a text editor and search for the word ‘xref’ you will get XREF table. A PDF consists of lots of COS objects and this tells you where they are located in the file. This is actually very useful. A PDF Reader just has to read these values and then it loads the objects only when they are needed. It does not need to parse or load the whole file. If the PDF file has been edited and objects changed, the changed version is often tagged onto the PDF with an updated xref table showing the new location. So it is possible for a PDF file to contain several XREF tables and the later values are used.

Stream length takes an input stream and returns the number of elements in the stream; it does not evaluate its elements. Stream-length may only be used on finite streams; it enters an infinite loop with infinite streams.

After brief introduction about XREF table and stream length, for details about repairing XREF table and stream lengths, please read the following paragraphs.

Step1. Download

Firstly, please download package of VeryPDF PDF Toolbox Command Line, and then, extract its content to your computer, and then, executive file “pdftoolbox.exe”, along with other files in one folder, could be located in your computer.

Step2. Run command prompt window

After extraction, please run cmd.exe to open command prompt window, which is operating environment of commands in Windows systems.

Step3. Start to repair PDF corrupted XREF table and stream lengths

Example:

..\bin\pdftoolbox.exe broken.pdf -outfile fixed.pdf

Explanations:

  • ..\bin\pdftoolbox.exe is to call executive file “pdftoolbox.exe”
  • sample_in1.pdf is to add corrupted PDF file “sample_in1.pdf” for process
  • -outfile _repair_out.pdf is to use parameter “-outfile” to specify output PDF file “_repair_out.pdf”

If you need to remove XFA tag from PDF file, please refer to the following example:

..\bin\pdftoolbox.exe "sample_fillform.pdf" -outfile "_removexfa_out.pdf" –removexfa

  • -removexfa: remove /XFA tag from PDF file

This is the end of how to repair PDF corrupted XREF table and stream lengths automatically with command line. If you encounter any questions, please do not hesitate to drop comments here. Then, for obtaining this tool eternally to produce no-watermark PDF, please buy VeryPDF PDF Toolbox Command Line.

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