Automatic optimization of PDFs

PDF files processed by pdfToolbox are automatically optimized when changes have been applied (e.g. via a Fixup or an Action) and file is saved. These optimizations are only applied when the PDF is saved - so this is not the case when an analysis-only processing is performed.
Even a normal re-save of a PDF will trigger the optimization.

All variants (Standalone, Server/CLI and SDK) of pdfToolbox 12 are doing the following optimizations by default:

  • Remove unreferenced objects
  • Optimize content stream (generating substreams that can be shared)
  • Merge identical forms and images (determined by an MD5 hash of their contents)

It is also possible to:

  • Also merge identical font descriptors and encodings
  • Disable the optimization completely

Adjust optimization in pdfToolbox Desktop

The way a PDF is going to be optimized in Standalone can be adjusted in the preferences:

Adjust optimization in pdfToolbox Server/CLI

  • The additional merge of identical font descriptors and encodings can be requested by the additional option --optimizepdf within a CLI command (as long as this command creates an output PDF).
  • Disable the optimization completely can be requested by the additional option --nooptimization within a CLI command (as long as this command creates an output PDF).

When using the hotfolder processing in Server, these options have to be set a an additional CLI parameters within each job.

For obvious reasons, the 2 options can not be combined.

The previously available action --optimizepdf has been deprecated, but can easily be substituted by:
--topdf --optimizepdf
as --optimizepdf has become a general file processing option on CLI.

Optimization in pdfToolbox 11 and older versions

In pdfToolbox 11 and previous versions, the automatic optimization also optimized the font structure by default.

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