Verify Text Signatures in Document Leave feedback
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GroupDocs.Signature for Python via .NET provides functionality to verify text signatures in documents. This guide demonstrates how to verify text signatures using Python.
Here’s a simple example showing how to verify text signatures in a document. The is_valid property of the returned VerificationResult is True when the document contains text signatures that match the TextVerifyOptions:
from groupdocs.signature import Signature
from groupdocs.signature.domain import TextMatchType
from groupdocs.signature.options import TextVerifyOptions
def verify_text_signatures():
with Signature("signed.pdf") as signature:
options = TextVerifyOptions()
options.all_pages = True # this value is set by default
options.text = "John Smith"
options.match_type = TextMatchType.CONTAINS
result = signature.verify(options)
if result.is_valid:
print(f"Document was verified successfully: {len(result.succeeded)} matching text signature(s).")
else:
print("Document failed verification process.")
if __name__ == "__main__":
verify_text_signatures()
signed.pdf is the sample file used in this example. Click here to download it.
Document was verified successfully: 1 matching text signature(s).
Here’s an example showing more advanced verification options: an exact text match, the TextSignatureImplementation to check (NATIVE, IMAGE, ANNOTATION, STICKER, FORM_FIELD or WATERMARK; NATIVE is the default) and the page to verify. The succeeded property of the result lists the text signatures that passed verification:
from groupdocs.signature import Signature
from groupdocs.signature.domain import TextMatchType, TextSignatureImplementation
from groupdocs.signature.options import TextVerifyOptions
def verify_text_signature_exact_match():
with Signature("signed.pdf") as signature:
options = TextVerifyOptions()
options.text = "John Smith"
options.match_type = TextMatchType.EXACT # require exact match
# Check text signatures that are part of the page content
options.signature_implementation = TextSignatureImplementation.NATIVE
# Verify the first page only (page numbers start at 1)
options.all_pages = False
options.page_number = 1
result = signature.verify(options)
print(f"Document is valid: {result.is_valid}")
for text_signature in result.succeeded:
print(f"Verified {text_signature.signature_implementation.name} text signature '{text_signature.text}'")
if __name__ == "__main__":
verify_text_signature_exact_match()
signed.pdf is the sample file used in this example. Click here to download it.
Document is valid: True
Verified NATIVE text signature 'John Smith'
You may easily run the code above and see the feature in action in our GitHub examples:
Along with the full-featured Python library, we provide simple but powerful free online apps.
To verify PDF, Word, Excel, PowerPoint, and other documents you can use the online apps from the GroupDocs.Signature App Product Family.
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