Qpdf

QPDF is a command-line program that does structural, content-preserving transformations on PDF files
Homepage:	http://qpdf.sourceforge.net/
License:	Artistic License 2.0
Platforms:	Windows, Linux
Function:	Metadata Extraction,Decryption
Content type:	Document
Appears in COW:	Validation Error Analysis and Treatment for PDF-hul 122 Invalid destination - Destination NULL, Validation Error Analysis and Treatment for PDF-hul 133 Invalid date

Description

Description from the project website:

QPDF is a command-line program that does structural, content-preserving transformations on PDF files. (...) It also provides many useful capabilities to developers of PDF-producing software or for people who just want to look at the innards of a PDF file to learn more about how they work.

User Experiences

• Caron, Bertrand. ‘“Validation OK” They Said: Fixing the Rendering of a So-Called Valid PDF’. Open Preservation Foundation (blog), 21 May 2025. https://openpreservation.org/blogs/validation-ok-they-said-fixing-the-rendering-of-a-so-called-valid-pdf/.
• Knijff, Johan van der. ‘Why PDF/A Validation Matters, Even If You Don’t Have PDF/A’. Open Preservation Foundation, 7 July 2015. https://openpreservation.org/blogs/why-pdfa-validation-matters-even-if-you-dont-have-pdfa/.
• Lindlar, Micky. ‘Trouble-Shooting PDF Validation Errors - a Case of PDF-HUL-38’. Open Preservation Foundation, 27 November 2022. https://openpreservation.org/blogs/trouble-shooting-pdf-validation-errors-a-case-of-pdf-hul-38/.
• Lindlar, Micky. ‘Destination Null: One of the Many Causes of PDF-Hul 122’. Open Preservation Foundation, 21 January 2024. https://openpreservation.org/blogs/destination-null-one-of-the-many-cases-of-pdf-hul-122/.