Update watermarks Leave feedback
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You can search a document for existing watermarks and modify them in place — for example, replace the text of a text watermark or swap the image of an image watermark.
Search for a watermark by its text content, then assign a new value to each match. The example below opens a document that already contains a “CONFIDENTIAL” watermark and replaces it with “APPROVED”.
from groupdocs.watermark import Watermarker
from groupdocs.watermark.search.search_criteria import TextSearchCriteria
def update_watermark():
with Watermarker("./watermarked-document.pdf") as watermarker:
# Find the watermarks whose text matches the criteria
possible = watermarker.search(TextSearchCriteria("CONFIDENTIAL"))
print("Found", len(possible), "possible watermark(s).")
for watermark in possible:
try:
watermark.text = "APPROVED"
except Exception:
# Some found entities do not support text editing — skip them
pass
watermarker.save("./output.pdf")
if __name__ == "__main__":
update_watermark()
watermarked-document.pdf is the sample file used in this example. Click here to download it.
Binary file (PDF, 479 KB)
Image watermarks can be found with perceptual hashing (ImageDctHashSearchCriteria) and updated by assigning new bytes to image_data. The example below finds the logo watermark and replaces it with an “APPROVED” stamp:
from groupdocs.watermark import Watermarker
from groupdocs.watermark.search.search_criteria import ImageDctHashSearchCriteria
def update_image_watermark():
with Watermarker("./watermarked-document.docx") as watermarker:
criteria = ImageDctHashSearchCriteria("./logo.png")
criteria.max_difference = 0.9
possible = watermarker.search(criteria)
with open("./stamp.png", "rb") as f:
image_data = f.read()
for watermark in possible:
try:
watermark.image_data = image_data
except Exception:
# Some found entities do not support image editing — skip them
pass
watermarker.save("./output.docx")
if __name__ == "__main__":
update_image_watermark()
watermarked-document.docx, logo.png, and stamp.png are the sample files used in this example. Download watermarked-document.docx, logo.png, and stamp.png.
Binary file (DOCX, 18 KB)
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