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I want to convert PDFs to PDF/A under either Windows or Linux.

If Windows I want a managed .NET library (with a DLL, not installation).

If Linux then the validation file must be readable for code.

Both converter and validator must be royalty-free.

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This question has been asked several times on Stack Overflow:

The answers link to several open-source libraries that do what you want, with some caveats:

  • Converting between complex specs is difficult, and tools generally have bugs. It may not be possible to convert losslessly.
  • Conversion may require information you don't have available, like XMP metadata and the fonts on the originating computer.
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