Error: This document (xxx.pdf) probably uses a compression technique which is not supported by the free parser shipped with FPDI.

FAQ

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Can I edit or modify a PDF document with FPDI?

If I import a whole document it's bookmark outline is gone, why?

After importing a page all annotations are gone, why?

After importing a page all form fields are gone, why?

After importing a page hidden content becomes visible?

After importing a page all comments are gone, why?

Can FPDI import encrypted/protected PDF documents?

Error: "This PDF document probably uses a compression technique which is not supported by the free parser shipped with FPDI."

By default FPDI can "only" handle PDF documents with a normal cross-reference which was the default way to store object offsets in a PDF document up to PDF version 1.4. Beginning with PDF version 1.5 there were new compression features introduced which involve internal structure changes how a PDF document can be created.

We offer a commercial addon which enables FPDI to handle documents that uses these compression features.

Alternatively the document you're trying to import has to be resaved without the use of compressed cross-reference streams and objects by an external programm (e.g. by lowering the PDF version to 1.4).