Stamp Class

Aspose.PDF for Python via .NET provides the Stamp class for placing reusable visual content on PDF pages. A stamp can be based on text, an image, or even a page from another PDF, and it can be positioned, rotated, styled, and limited to specific pages.

This article demonstrates several common stamp workflows:

  1. Create reusable text resources for text-based stamps.
  2. Add image and PDF-page stamps.
  3. Add styled text stamps.
  4. Limit a stamp to selected pages.
  5. Configure a background image stamp.

The example uses two helper functions: one creates formatted text for text-based stamps, and the other creates a TextState object used to style text stamps.

import sys
from os import path

import aspose.pdf as ap
import aspose.pdf.facades as pdf_facades
import aspose.pydrawing as drawing

from config import initialize_data_dir, set_license


def _create_text_logo(text: str) -> pdf_facades.FormattedText:
    """Create formatted text for text stamp examples."""
    return pdf_facades.FormattedText(
        text,
        drawing.Color.blue,
        drawing.Color.light_gray,
        pdf_facades.FontStyle.HELVETICA_BOLD,
        pdf_facades.EncodingType.WINANSI,
        True,
        14,
    )


def _create_text_state() -> ap.text.TextState:
    """Create a text state used to style text stamps."""
    text_state = ap.text.TextState()
    text_state.foreground_color = ap.Color.dark_blue
    text_state.font_size = 16
    text_state.font_style = ap.text.FontStyles.BOLD
    return text_state

Add an image stamp

Use bind_image() when the stamp should display an image such as a logo, badge, or icon. After binding the image, you can set the stamp ID and origin before adding it to the document.

import sys
from os import path

import aspose.pdf as ap
import aspose.pdf.facades as pdf_facades
import aspose.pydrawing as drawing

from config import initialize_data_dir, set_license


def add_image_stamp(infile: str, image_file: str, outfile: str) -> None:
    """Add an image stamp to the PDF."""
    pdf_stamper = pdf_facades.PdfFileStamp()
    try:
        pdf_stamper.bind_pdf(infile)

        stamp = pdf_facades.Stamp()
        stamp.bind_image(image_file)
        stamp.stamp_id = 1
        stamp.set_origin(36, 520)

        pdf_stamper.add_stamp(stamp)
        pdf_stamper.save(outfile)
    finally:
        pdf_stamper.close()

Add a PDF page as a stamp

Use bind_pdf() when you want to use a page from another PDF file as the stamp content. This is useful for overlays such as approvals, templates, or prebuilt visual elements stored in a separate document.

import sys
from os import path

import aspose.pdf as ap
import aspose.pdf.facades as pdf_facades
import aspose.pydrawing as drawing

from config import initialize_data_dir, set_license


def add_pdf_page_as_stamp(infile: str, stamp_pdf: str, outfile: str) -> None:
    """Add the first page of another PDF as a stamp."""
    pdf_stamper = pdf_facades.PdfFileStamp()
    try:
        pdf_stamper.bind_pdf(infile)

        stamp = pdf_facades.Stamp()
        stamp.bind_pdf(stamp_pdf, 1)
        stamp.page_number = 1
        stamp.set_origin(36, 250)

        pdf_stamper.add_stamp(stamp)
        pdf_stamper.save(outfile)
    finally:
        pdf_stamper.close()

Add a text stamp with text state

Use bind_logo() together with bind_text_state() when you want to create a text-based stamp with custom font styling. This approach is useful for approval marks, labels, and workflow-specific annotations.

import sys
from os import path

import aspose.pdf as ap
import aspose.pdf.facades as pdf_facades
import aspose.pydrawing as drawing

from config import initialize_data_dir, set_license


def add_text_stamp_with_text_state(infile: str, outfile: str) -> None:
    """Add a text stamp and style it with a TextState object."""
    pdf_stamper = pdf_facades.PdfFileStamp()
    try:
        pdf_stamper.bind_pdf(infile)

        stamp = pdf_facades.Stamp()
        stamp.bind_logo(_create_text_logo("Approved by signing workflow"))
        stamp.bind_text_state(_create_text_state())
        stamp.set_origin(36, 700)
        stamp.rotation = 15.0

        pdf_stamper.add_stamp(stamp)
        pdf_stamper.save(outfile)
    finally:
        pdf_stamper.close()

Add a stamp to specific pages

If the stamp should not appear on every page, assign the target page numbers to the pages property. This example adds an image stamp only to the first page.

import sys
from os import path

import aspose.pdf as ap
import aspose.pdf.facades as pdf_facades
import aspose.pydrawing as drawing

from config import initialize_data_dir, set_license


def add_stamp_to_specific_pages(infile: str, image_file: str, outfile: str) -> None:
    """Add an image stamp only to the selected pages."""
    pdf_stamper = pdf_facades.PdfFileStamp()
    try:
        pdf_stamper.bind_pdf(infile)

        stamp = pdf_facades.Stamp()
        stamp.bind_image(image_file)
        stamp.pages = [1]
        stamp.set_origin(400, 40)
        stamp.set_image_size(120, 60)

        pdf_stamper.add_stamp(stamp)
        pdf_stamper.save(outfile)
    finally:
        pdf_stamper.close()

Add a background image stamp

Use a background stamp when the image should appear behind the page content. You can also control the stamp opacity, rotation, quality, size, and position to create watermark-style effects.

import sys
from os import path

import aspose.pdf as ap
import aspose.pdf.facades as pdf_facades
import aspose.pydrawing as drawing

from config import initialize_data_dir, set_license


def add_background_image_stamp(infile: str, image_file: str, outfile: str) -> None:
    """Add a rotated background image stamp with opacity and quality settings."""
    pdf_stamper = pdf_facades.PdfFileStamp()
    try:
        pdf_stamper.bind_pdf(infile)

        stamp = pdf_facades.Stamp()
        stamp.bind_image(image_file)
        stamp.is_background = True
        stamp.opacity = 0.35
        stamp.quality = 90
        stamp.rotation = 45.0
        stamp.set_image_size(160, 80)
        stamp.set_origin(200, 300)

        pdf_stamper.add_stamp(stamp)
        pdf_stamper.save(outfile)
    finally:
        pdf_stamper.close()
Form Class PdfFileStamp Class