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Strikethrough annotations in a PDF viewer let users mark text for deletion while keeping the original content visible, helping teams review proposed edits in context. This supports clear collaboration without altering the source file and creates an audit trail for legal or editorial review. It enables fully digital, searchable workflows ideal for updating technical documents, refining contracts, or revising marketing content with accuracy and transparency.
Several .NET Winforms components offer strikethrough annotations including:
For an in-depth analysis of features and price, visit our comparison of .NET Winforms PDF Viewer components.

Merging PDFs involves combining two or more separate PDF files into a single cohesive document, preserving the original formatting and quality of each page. This process improves file management by reducing clutter and making it easier to locate and share information, while also minimizing storage overhead. Benefits include consistent headers and footers across pages and simplified collaboration through a single master file for review and annotation. Common use cases include uniting research articles for academic literature reviews, and creating unified project portfolios or client presentations.
Several .NET WPF components offer PDF merging including:
For an in-depth analysis of features and price, visit our comparison of .NET WPF PDF components.

PDF annotation capabilities in PDF components provide powerful tools for users to interact with and enhance digital documents. These features are essential across industries where document review, feedback, and collaboration are critical, such as legal, education, engineering, and publishing. By integrating annotation support, developers enable users to mark up content visually, add commentary, and highlight important information, all without altering the underlying document content. Annotations are typically stored separately from the base file data, ensuring document integrity while allowing flexible interaction.
Common features include:
For an in-depth analysis of features and price, visit our .NET PDF components comparison.

The PDF Xpansion SDK from Soft Xpansion is a powerful development toolkit for integrating advanced PDF and electronic document processing into desktop, server, and mobile applications. It supports creating, editing, converting, displaying, and printing PDF files, along with handling related formats like XPS and OpenXPS. The SDK complies with ISO PDF standards and offers robust features for digital signatures, form processing, text extraction, and document security. It also includes specialized capabilities for e-invoicing, supporting formats such as ZUGFeRD and Factur-X, and provides PDF viewer functionality for seamless document display. This makes it an ideal solution for automating document workflows and ensuring regulatory compliance in enterprise environments.
The PDF Xpansion SDK 17.1.3 update introduces official support for both .NET 8 and the latest .NET 9, enabling developers to integrate advanced PDF functionality into modern applications while taking full advantage of the newest runtime optimizations and language enhancements. This ensures higher performance, improved scalability, and stronger security for document processing solutions. With support for .NET 9, development teams can leverage cutting-edge features such as improved Just-In-Time (JIT) and native Ahead-Of-Time (AOT) compilation, resulting in faster application startup times and reduced memory consumption. This update helps future-proof projects and supports the latest trends in application development.
PDF Xpansion SDK products are licensed per company location where developers use the SDKs. Optional Add-Ons are available which require ownership of SDK site licenses. Maintenance Subscription is available providing product updates (error corrections) and support services. See the product license pages for full details:
Learn more about PDF Xpansion SDK on our product pages:

Adding a page to a PDF file is a key feature in modern PDF viewer components, enabling users to dynamically insert new content into existing documents. This capability is particularly useful in web applications that require real-time document editing or automated PDF generation, such as form processing, report building, or multi-user collaboration platforms.
Several ASP.NET Core PDF viewer controls offer the ability to add pages to a PDF file including:
For an in-depth analysis of features and price, visit our ASP.NET Core PDF viewer controls comparison.