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Aspose.PDF for Python

Add Underline annotations to PDF documents via Python SDK

API for adding PDF document underline annotations using Aspose.PDF Cloud Python SDK.

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Aspose.PDF Cloud SDK for Python Aspose.PDF Cloud SDK for Python

Overview

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How to insert Underline annotations to PDF documents via Aspose.PDF Cloud Python SDK

To add underline annotations into PDF, we’ll use Aspose.PDF Cloud Python SDK. This Cloud SDK assists Python programmers in developing cloud-based PDF creator, annotator, editor, and converter apps using Python programming language via Aspose.PDF REST API. Simply create an account at Aspose for Cloud and get your application information. Once you have the App SID & key, you are ready to give the Aspose.PDF Cloud Python SDK. If the python package is hosted on Github, you can install directly from Github:

Installation from Github


     
    pip install git+https://github.com/aspose-pdf-cloud/aspose-pdf-cloud-python.git

Package Manager Console Command

     
    pip install asposepdfcloud

Steps to add annotations to PDF via Python

Aspose.PDF Cloud developers can easily load & add underline annotations to PDF in just a few lines of code.

  1. Install Python SDK.
  2. Creates underline annotation with metadata (visual styling, text metadata, layout, extra attributes).
  3. Submit Annotation to PDF.
  4. Handles the server response.
  5. Downloads the updated file.
 

Add Underline Annotations to PDF using Python


    from asposepdfcloud import PdfApi, ApiClient, UnderlineAnnotation, Rectangle, Color, AnnotationFlags, HorizontalAlignment, Point, VerticalAlignment
    import shutil
    import os
    import json
    from pathlib import Path
    import logging

    # Configure logging
    logging.basicConfig(level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s")

    class PdfAddUnderlineAnnotations:
        """Class for managing PDF annotations using Aspose PDF Cloud API."""
        def append_underline_annotation(self):
            """Append a new underline text annotation to the PDF document."""
            localFolder = "C:\Samples"
            storageDocumentName = "sample.pdf"
            storageTempFolder = "TempPdfCloud"
            outputFileName = "output_add_highlight_annotation.pdf"

            # Get your AppSid and AppSecret from https://dashboard.aspose.cloud (free registration required). 
            self.pdf_api = PdfApi(ApiClient(AppSecret, AppSid))

            if self.pdf_api:
                file_path = localFolder + "/" + storageDocumentName
                self.pdf_api.upload_file(os.path.join(storageTempFolder, storageDocumentName), file_path)
                    
                args = {
                    "folder": storageTempFolder
                }
                new_annotation = UnderlineAnnotation(
                    rect = Rectangle(llx=100, lly=350, urx=450, ury=400),
                    name = 'Underline Text Annotation',
                    flags = [AnnotationFlags.DEFAULT],
                    horizontal_alignment = HorizontalAlignment.CENTER,
                    vertical_alignment = VerticalAlignment.TOP,
                    rich_text = "Your annotation text here",
                    subject = "Your annotation subject here",
                    contents = "Your annotation contents here",
                    title = "Your annotation title here",
                    z_index = 1,
                    color=Color(a=0xFF, r=0, g=0xFF, b=0),
                    quad_points = [
                        Point(10, 10),
                        Point(20, 10),
                        Point(10, 20),
                        Point(10, 10)
                    ],
                    modified = '02/02/2026 00:00:00.000 AM',
                )
                
                try:
                    response = self.pdf_api.post_page_underline_annotations(storageDocumentName, page_number=1, annotations=[new_annotation], **args)
                    if response.code == 200:
                        temp_file = self.pdf_api.download_file(storageTempFolder + '/' + storageDocumentName)
                        local_path = localFolder + '/' + outputFileName
                        shutil.move(temp_file, local_path)
                        logging.info(f"append_underline_annotation(): annotation added to the document '{outputFileName}'.")
                    else:
                        logging.error(f"append_underline_annotation(): Failed to add annotation to the document. Response code: {response.code}")
                except Exception as e:
                    logging.error(f"append_underline_annotation(): Error while adding annotation: {e}")