Hello,For the same docx file, the generated pdf file md5sum is inconsistent

Aspose.Total Product Family
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1

Dear

There is a new problem, please help to check, checked the document for a long time but did not find a solution:

The following code is called twice for the same docx file

file_path = "test.docx"
doc = awords.Document(file_path)
save_path = os.path.join(os.path.basename(file_path).split("." )[0] + ".pdf")
doc.save(save_path, awords.SaveFormat.PDF)

The generated pdf file md5sum is inconsistent, which has nothing to do with the specific file

Requirement: What should I do to ensure that the pdf md5sum value is consistent each time I produce it? Is there any way

thank you

2

@Maggieee

To ensure that the MD5 checksum of the generated PDF file remains consistent each time you convert the same DOCX file, you can follow these guidelines:

  1. Use Consistent Save Options: When saving the document to PDF, utilize the PdfSaveOptions class to specify options that can affect the output. This includes settings for compliance with PDF standards, image compression, and other rendering options. By ensuring that these options are the same for each conversion, you can help maintain consistency.

  2. Control Document Properties: Some document properties, such as timestamps or metadata, can change with each save operation. To avoid this, you can set the document’s properties to fixed values before saving. For example, you can clear or standardize the document’s metadata.

  3. Environment Consistency: Ensure that the environment in which the conversion is performed is consistent. This includes using the same version of the Aspose.Words library, the same operating system, and the same hardware configuration.

  4. Avoid Random Elements: If your document contains any elements that may change (like watermarks, dynamic fields, or content that is generated randomly), ensure that these are either removed or standardized before saving.

Here is an example of how you might implement the PdfSaveOptions:

import os
import aspose.words as awords

file_path = "test.docx"
doc = awords.Document(file_path)

# Set PDF save options
pdf_options = awords.saving.PdfSaveOptions()
pdf_options.compliance = awords.saving.PdfCompliance.PDF_A_1_B  # Example compliance setting

save_path = os.path.join(os.path.basename(file_path).split(".")[0] + ".pdf")
doc.save(save_path, pdf_options)

By following these steps, you should be able to achieve consistent MD5 checksums for the generated PDF files from the same DOCX document. If you continue to experience inconsistencies, consider checking for any additional factors that may be influencing the output.

4

@Maggieee It is expected that PDF documents generated from the same MS Word document are binary different. There are several places in the code that generates PDF document where different object identifiers are used. For example, PDF specification says that it is highly recommended that File Identifier should be unique. So Aspose.Words generates an unique PdfFileId for each document.
I am afraid there is no way to generate binary identical PDF document. I suppose you would like to compare the generated PDFs to make sure they are the same and nothin was changed, for example after updating Aspose.Words version. We use a similar approach for our internal tests. but in most cases we compare the documents visually, i.e. render PDF documents to images and then compare an etalon images with images of PDF document pages.