When converting very large documents, you may experience a problem with running out of memory.
This is generally a memory limitation imposed by the Operating System since memory allocation fails at about 1 gigabyte.

In order to ensure our software can remain compatible with older systems, PDF2XL is a 32-bit program, though it will run on a 64-bit system.
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To successfully convert the document, it will be necessary to convert it in sections by using page ranges and converting to the existing sheet.