Key Differentiators

eSignature workflows with C# PDF .NET SDK

Bulk Digital Signature Workflows

Built to handle high volumes of PDFs. With native multithreaded technology and a variety of other enhancements, you can rapidly generate, edit and delete PDF documents with customizable digital signatures at scale.

Online PDF eSign C# PDF .NET SDK

Server-side and Online PDF Digital Signatures

Quickly implement online and offline digital signature workflows for a premier document signature experience.

C# PDF SDK support

Premier Support

ActivePDF’s C# PDF SDK is fully supported by our in-house team to help you build, customize, and deploy faster.

Highlight Features

Trusted Time-stamping

eSignature timestamp with C# .NET SDK

Capture PDF digital signature metadata with trusted timestamp validation. Date and time of the digital signature are digitally recorded by a trusted server or time-stamping authority (TSA), protecting the signee from any form of dispute or manipulation from an outside source.

Safe and Secure

Encrypt and password eSignature with C# .NET SDK

Encrypt and password protect sensitive digitally signed documents using RC4 40-bit and 148-bit and AES 128-bit and 256-bit encryption.

C# PDF Digital Signature Products

Toolkit Ultimate C# PDF SDK

Toolkit Ultimate

Award-winning PDF SDK library to create and convert PDF documents, with the extra functionality to merge, modify, extract, redact, rasterize, compress, digitally sign, form-fill, embed barcodes and more. Set stamps, bookmarks, page numbers and customized printing functions with full control over PDF output. Security functionalities include the ability to encrypt, decrypt and digitally sign.

Download & Documentation

WebGrabber HTML to PDF C# SDK


A .NET C# developer SDK tool used to convert HTML webpages to PDF. Consistent, reliable and accurate, WebGrabber generates high-quality, compact PDF files from HTML or URLs using familiar standards-based language and fully supports PDF signatures. This flexible SDK provides developers the ability to programmatically customize PDF output, which includes a user configuration manager that can be easily accessed remotely.

Download & Documentation