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A stamp signature is a special type of electronic signature that has the visual appearance of a round seal and its visual parameters can be set programmatically. Every stamp signature can have multiple “stamp lines” with custom text and different line thicknesses, colors, font weights and sizes. Here is an example of how a stamp signature created with GroupDocs.Signature for Python via .NET may look like:
GroupDocs.Signature provides the StampSignOptions class to specify different options for Stamp signature:
- Stamp type - Round or Square;
- Height and width in pixels;
- Alignment and position within the document page;
- and many more.
Each Stamp option contains inner and outer lines. Inner lines represent horizontal lines of text inside the stamp, while outer lines represent circles (or rectangles based on stamp type) around the stamp with their own text, border settings, background etc.
Here are the steps to add a Stamp signature to a document with GroupDocs.Signature:
- Create a new instance of the Signature class and pass the source document path as a constructor parameter.
- Instantiate the StampSignOptions object according to your requirements and specify appropriate options.
- Call the Sign method of the Signature class instance and pass the StampSignOptions to it.
This example shows how to add a Stamp signature to a document using Python:
from groupdocs.signature import Signature
from groupdocs.signature.options import StampSignOptions
from groupdocs.signature.domain import StampLine
from groupdocs.pydrawing import Color
def sign_with_stamp_signature():
with Signature("sample.docx") as signature:
# Create stamp signature options
options = StampSignOptions()
# Set stamp position and size
options.left = 380
options.top = 520
options.width = 160
options.height = 160
# Outer line: a ring of text around the stamp
outer_line = StampLine()
outer_line.text = " * European Union * European Union * European Union *"
outer_line.font.size = 12
outer_line.height = 22
outer_line.text_bottom_intent = 6
outer_line.text_color = Color.white_smoke
outer_line.background_color = Color.dark_slate_blue
options.outer_lines.append(outer_line)
# Inner line: a horizontal line of text inside the ring
inner_line = StampLine()
inner_line.text = "John"
inner_line.text_color = Color.medium_violet_red
inner_line.font.size = 20
inner_line.font.bold = True
inner_line.height = 40
options.inner_lines.append(inner_line)
# Sign the document and save the result
result = signature.sign("signed_stamp.docx", options)
print(f"Signed with {len(result.succeeded)} stamp signature(s)")
if __name__ == "__main__":
sign_with_stamp_signature()
sample.docx is the sample file used in this example. Click here to download it.
Binary file (DOCX, 55 KB)
Here’s an example showing how to create a more complex stamp signature with multiple lines and custom styling. It draws a square stamp instead of the default round one, and repeats the text of each outer line to fill the whole frame:
from groupdocs.signature import Signature
from groupdocs.signature.options import StampSignOptions
from groupdocs.signature.domain import StampLine, StampTextRepeatType, StampTypes
from groupdocs.pydrawing import Color
def create_stamp_line(text, font_size, height, text_color):
line = StampLine()
line.text = text
line.font.size = font_size
line.font.bold = True
line.height = height
line.text_color = text_color
return line
def sign_with_stamp_signature_advanced():
with Signature("sample.docx") as signature:
options = StampSignOptions()
# Set stamp position, size and type
options.left = 340
options.top = 480
options.width = 220
options.height = 160
options.stamp_type = StampTypes.SQUARE
# Two outer lines: frames of repeated text around the stamp
for text, font_size, height in ((" APPROVED *", 11, 22), (" 2026 *", 9, 18)):
line = create_stamp_line(text, font_size, height, Color.white)
line.background_color = Color.dark_blue
line.text_bottom_intent = 4
line.text_repeat_type = StampTextRepeatType.FULL_TEXT_REPEAT
options.outer_lines.append(line)
# Two inner lines of text in the middle of the stamp
options.inner_lines.append(create_stamp_line("John Smith", 16, 32, Color.dark_blue))
options.inner_lines.append(create_stamp_line("CEO", 12, 24, Color.dark_blue))
result = signature.sign("signed_stamp_advanced.docx", options)
print(f"Signed with {len(result.succeeded)} stamp signature(s)")
if __name__ == "__main__":
sign_with_stamp_signature_advanced()
sample.docx is the sample file used in this example. Click here to download it.
Binary file (DOCX, 62 KB)
This guide explains how to apply stamp-based signatures to documents using GroupDocs.Signature for Python via .NET. It covers the process of creating a stamp signature, customizing its appearance, and positioning it on the document. The signed document can then be saved with the stamp signature applied.
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 sign PDF, Word, Excel, PowerPoint, and other documents you can use the online apps from the GroupDocs.Signature App Product Family.
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