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fluidum/pdf_watermark_removal.txt

Last active October 7, 2022 15:48
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pdf_watermark_removal.txt
# Set a PDF password as variable because it might contain special symbols and it will break shell if not quoted
PDF_PASSWORD='<space_holder>'
# qpdf utility will help removing encryption. https://qpdf.readthedocs.io/
qpdf --decrypt --password="$PDF_PASSWORD" encrypted.pdf unencrypted.pdf
# Watermark can be removed PDF is not encrypted.
# One type of watermarks in PDF-s are detected by lines that contain string BaseEncoding and what we will remove below.
sed -i '/BaseEncoding/d' unencrypted.pdf
# Validate your new outcome if its watermark free or not. If not then keep researching your solution.
# Note: I noticed some cache issue when I had opened watermarked PDF previously in Windows 10 machine (new file was on another path). sha256sum was equal in Linux and Windows. In my case I uploaded file to sharepoint and watermark was successfully removed.
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