Find and Remove Watermarks from Documents in C#

Today, we will have a look at how to find and remove watermarks from documents in C#. There can be text and image-based watermarks in a document. We can easily search and programmatically remove such watermarks from many PDF, Word, Excel, PowerPoint, and Visio supported documents.

Following topics will be covered in this article:

  • .NET API for removing watermarks
  • Find watermarks in documents using C#
  • Remove watermarks from documents in C#
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eSign Documents and Images with QR Code using C#

In this article, we will see how to programmatically add QR codes to electronically sign documents and images using C#. GroupDocs.Signature for .NET is the API to add QR codes in PDF files, word processing documents, spreadsheets, presentations, and images.

It supports various electronic signatures for a large list of supported file formats. Among the QR codes, it supports Aztec Code, DataMatrix Code, GS1 DataMatrix, GS1 QR, QR types. The API allows us to add QR codes to JPG/JPEG, PNG, WebP, BMP, GIF, SVG, CMX, and TIFF images and some more image file formats as well.

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eSign Documents and Images with QR Code in Java

QR code (Quick Response code) is the type of 2D Barcodes or matrix barcode. It is the machine-readable label that contains information about the attached item. This article will guide you about programmatically adding QR codes to electronically sign your documents and images using Java.

I will be using GroupDocs.Signature for Java API to add QR codes in PDF files, word documents, spreadsheets, presentations, and images like JPG/JPEG, PNG, WebP, BMP, GIF, SVG, CMX, and TIFF.

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Convert CAD Drawings to PDF in C#

Today, we will learn how to programmatically convert the CAD drawings to PDF format in C#. Previously, in an earlier post, we did the same but in Java. We looked to convert the DWG, DGN, and DWF files into PDF document with the code example. Let's do it in C# using the document conversion API for .NET.

Following topics will be covered in this article:

  • C# API to Convert CAD Drawings
  • Converting CAD Drawings (DWG, DWF, DGN) to PDF in C#
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Convert CAD Drawings to PDF in Java

CAD stands for Computer-Aided Design. It is used to create 2D and 3D architectural designs, computer animations, special effects in movies, technical drawings, and much more. PDF is one of the most well-known file formats that is famous due to its portability. Here comes the need to convert CAD files to PDF format when such technical drawings are to be transferred to a normal user who is not equipped with the technical software that supports CAD drawings. This article will help programmers to add the feature to convert different CAD formats like DWG, DGN, or DWF into PDF in Java applications.

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Extract Images from Documents using C#

In this article, we will be learning to programmatically extract images from PDF, Excel, PowerPoint, and Word documents in a C# application using document parsing .NET API.

GroupDocs.Parser for .NET is document parsing and data extraction .NET API. It supports document parsing and extraction of images, text, and metadata from word-processing documents, spreadsheets, presentations, archives, and email documents.

Extracted images can be saved in BMP, GIF, JPEG, PNG, and WebP formats.

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Extract Images from Documents using Java

Today, we will learn to programmatically extract images from PDF, Excel, PowerPoint, and Word documents using Java. For the extraction of images, we will use GroupDocs.Parser for Java. This Java API supports the parsing of documents and extraction of images, text, and metadata from word-processing documents, spreadsheets, presentations, archives, and email documents. Extracted images can be saved in BMP, GIF, JPEG, PNG, and WebP formats.

Following topics will be covered in this article:
  • Image Extraction Java API
  • Image Extraction from PDF documents in Java
  • Extract Images from Word, Excel, PowerPoint documents in Java
  • Extract Image from Specific Page in Java
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Insert OLE Objects in Word, Excel, PowerPoint using Java

Today, we will be learning to embed PDF and other different documents as OLE objects in Word, Excel, PowerPoint files using Java. For embedding the documents via Object Linking and Embedding, we will be using the GroupDocs.Merger for Java API that also allows us to efficiently combine/merge and split multiple documents with minimum lines of Java code.

Steps shown here will guide you to:
  • Insert PDF as OLE object into MS Word document.
  • Embed Word document as OLE object into Excel spreadsheet.
  • Insert Excel sheets as OLE object into presentations.
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Verify Digital Signature in Documents using Java

In this article, we will be learning to programmatically verify the digitally signed documents using Java. The example uses PDF document for the verification, however, you may also perform verification of digitally signed word processing documents like MS Word DOC/DOCX, Excel spreadsheets XLS/XLSX, and presentations PPT/PPTX.

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Add Watermark to Images in Java

In this article, we will learn to add text and image watermarks to images using Java. There can be two ways to add watermark to images. Either you want to add the watermark with the personalized text or add an image watermark over the source image. We will see both scenarios. Currently, in addition to the JPG and PNG, this Java API supports BMP, GIF, JP2, TIFF & WebP image formats for adding watermarks on it. We can also change the style, orientation, and appearance of the watermark text.

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