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GroupDocs.Comparison for Python via .NET compares PDF documents and identifies changes in text, formatting, annotations, and structure. Typical use cases include contract review, legal-document comparison, and any workflow where precise difference detection is critical.

The API:

• Compares two or more PDF files.
• Highlights insertions, deletions, and formatting changes.
• Saves the comparison result to a new PDF or any other supported format.

1. Create a Comparer instance and load the source PDF file.
2. Add one or more target PDF files via add().
3. Call compare() with the result file path.

from groupdocs.comparison import Comparer

def compare_pdf_documents():
    with Comparer("./source.pdf") as comparer:
        comparer.add("./target.pdf")
        comparer.compare("./result.pdf")

if __name__ == "__main__":
    compare_pdf_documents()

Binary file (PDF, 279 KB)

• Text vs. images. By default, PDF comparison detects both text and embedded image changes. For text-only review, disable image comparison — see Disable image comparison in PDF documents. Text-only mode is faster and produces less visual noise when the PDFs differ only in scanned figures or watermarks.
• Annotations and form fields. GroupDocs.Comparison detects changes in PDF annotation text and form-field values alongside body text.
• Page-level coordinates. Set calculate_coordinates = True on CompareOptions to receive pixel-accurate change locations on each page — useful for overlay UIs. See Get changes coordinates.
• Password-protected PDFs. Pass a LoadOptions with password set — see Load password-protected documents.

• Disable image comparison in PDF documents — skip image comparison for faster PDF diffs.
• Get changes coordinates — pixel coordinates for each detected change.
• Customize changes styles — change highlight colours.
• Save comparison result in a different format — export a PDF diff to DOCX or HTML for review tools that don’t render PDF inline.