Add Watermark to Documents while Conversion in C# or Java

Document conversion is one of the most frequent processes that endures across a lot of industries. Sometimes, it is the business need to put a watermark on the resultant document after conversion. For example, you want to convert a Word document to PDF or PowerPoint PPT/PPTX to PDF with a watermark (text or image) in all the PDF pages.

GroupDocs.Conversion for .NET and Java gives you such an option. It possesses a class WatermarkOptions with rich properties such as:

  • Text/Font
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Introducing Z-Order for Text Signatures in GroupDocs.Signature for .NET 19.9

We are back with another monthly release of our eSign API – GroupDocs.Signature for .NET. This release includes three new features, three improvements, and a bug fix. So in this article, I’ll give you a walk-through of the latest release.

Support of Z-Order for Text Signatures

Z-order determines the order for the overlapping, two-dimensional objects in an x-y plane. Put it simply, if X-axis represents the width and Y-axis represents the height then Z-order will represent the depth of … Continue Reading

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Adjust Contrast when Converting a Document to Image

Up till now, there was a simple document to image conversion process. With the GroupDocs.Conversion for Java release version 19.10, we’ve added a number of interesting features for image conversion.

  • Set color mode when converting to JPEG
  • Option to set compression mode
  • Adjust image brightness and contrast
  • Set gamma
  • Option to flip image

Have a look at its implementation of the above features in Java

Conversion from CDR

CDR is a vector graphics file. API now allows you to … Continue Reading

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Extract Images from PDF Documents using C#

Portable Document Format (PDF) is a popular and widely used document format developed by Adobe. The PDF documents can contain a variety of content including formatted text, images, annotations, form fields, etc. Parsing PDF document programmatically is a popular use case and there are multiple ways of extracting the text. However, extracting images from a PDF document is a complex task. This article demonstrates how easily you can extract images from the PDF documents programmatically in C# using GroupDocs.Parser for … Continue Reading

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Introducing more simplified and improved GroupDocs.Merger for .NET

GroupDocs.Merger for .NET allows you to merge or manipulate document structure across a wide range of file formats. Those who are new to this API, you can join several documents into one, split single document to multiple documents, reorder or replace document pages, change page orientation and manage document password.

Version 19.9 is a major release. We totally restructured the API and below are the reasons to migrate:

  • Merger class introduced as a single entry point to manage the
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Introducing API v2 of GroupDocs.Parser for .NET

The all-new API v2 of GroupDocs.Parser for .NET has been released! It would be a piece of breaking news for those who are already using our document parsing API as well as who are looking for an easy to use solution for extracting text, images, and metadata from PDF, word processing documents, spreadsheets, presentations, emails, EPUB & ZIP file formats.

What’s new in the API v2?

We have done some major updates at … Continue Reading

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Process the Microsoft Outlook Email Attachments in a .NET Viewer Application


An ‘attachment’ is a file such as a document or a photo that is attached to an email. It’s easy to attach pictures, files, contacts, emails and many other items to your Outlook messages. If you selected a file on your local computer or group document library for the attachment purpose, a copy of the file is attached to the email.

The case: A software developer is making a document viewing application. Although, his application is capable to render the MS … Continue Reading

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Redact Classified Content from Documents using All-New GroupDocs.Redaction for .NET

We are continuing the journey of revamping our products to bring a more simplified and easy to use interfaces for you. We have done it for many of our document manipulation APIs and recently, we have released all-new GroupDocs.Redaction for .NET API for you as v19.9. With this release, we have made it even easier for you to programmatically remove or mask classified information from text, metadata, and the annotations in MS Word, Excel, PowerPoint… Continue Reading

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Verify Digital Signature in Documents using C#

Digital Signatures in documents look similar to the paper-based signatures, however, being certificate-based electronic signatures they contain the identity of the signer in encrypted form. The certificates are issued by trusted and authorized Certificate Authorities. These authorities identify the person the certificates are issued to. This is why the digitally signed documents can be verified at any time. In this article, I’ll show you how to programmatically verify the digital signature in PDF, Word, and Excel, documents … Continue Reading

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Introducing Simple and Easy to Use .NET Document Conversion API

We are introducing a new public API that is designed to be implemented easily. Those who are using previous version of the API (below 19.9), you don’t have to worry. The legacy API has been moved into legacy namespace. If you want to upgrade to v19.9, it is required to make project-wide replacement of namespace usages from GroupDocs.Conversion to GroupDocs.Conversion.Legacy in order to avoid any build issues.

Why to use new version?

  • Converter class introduced as a single entry
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