Best Free PDF SDK

Whether you have thousands of documents or millions, Pdftools has the products and services to help make processing a breeze. Designed for document-heavy industries, Pdftools’ suite of SDKs and APIs are here to make your document workflows easier, faster, and stress-free. Built on SDKs and APIs, the Pdftools products integrate seamlessly into your existing (or new) systems and applications. Process thousands of documents every minute. Our tools are precision-engineered to be efficient and run at blazing speeds. We’re engineers at heart, so we’re only satisfied with the most reliable, orderly, and usable, and well-documented platforms. Shrink file sizes down, but keep the quality and interactivity. Your documents will always be compliant for long-term archiving. We’ve obsessed over every detail in our products, and documented everything so it’s easy to get started.

ComPDF, powered by KDAN (TPEx: 7737), is built on the vision of “Leading the Intelligent PDF Era with Continuous Innovation”. ComPDF offers following products: - ComPDF SDK is highly compatible with web, server, desktop, and mobile platforms, seamlessly integrating with various development frameworks. It provides features lincluding generation, viewing, editing, conversion, signing, etc. - ComPDF Cloud delivers a secure, stable, and efficient service environment, simplifying enterprise document processing and business integration workflows. With the flexibility to use either Open API calls or private deployment, enterprises can generate, edit, convert, OCR recognize, and extract data. - ComPDF AI provides intelligent document processing capabilities, enabling automated data extraction, parsing, and knowledge management. Together, these components streamline workflows, improve operational efficiency, and accelerate enterprise digital transformation.

pdfToolbox offers powerful, dynamic, and easy-to-integrate PDF processing, from quick visual inspection and fixing to fully unattended processing of thousands of files. Using rock-solid Adobe technology pdfToolbox provides checking and fixing of even very complex problems, color management, impositioning, conversion to and from PDF, and more. pdfToolbox technology is used by small companies, large publishers, and print providers as well as OEMs that integrate the technology in their own solutions. pdfToolbox Desktop is a manual PDF preflight and correction application, available as a plug-in in Adobe Acrobat Pro or as a standalone application. pdfToolbox offers prepress operators an easy-to-use interface for all pre-press actions, which gets you to each action you might need in three simple steps. You can easily customize this further, so you have your favorite actions at your fingertips.

PDFlib GmbH is completely focused on PDF technology. Customers are using our products since 1997. In 2006 we were one of the founding members of the PDF Association (formerly PDF/A Competence Center). The company closely follows development and market trends such as ISO standards for PDF. PDFlib GmbH products are distributed all over the world with major markets in Europe, North America and Japan. PDFlib is a well-established developer component for generating and manipulating PDF documents. PDFlib’s main targets are dynamic PDF creation on a web server and PDF creation in any kind of server, desktop or mobile application. You can use PDFlib to dynamically create PDF documents from database contents, similar to dynamic Web pages. Since 1997 PDFlib has proven itself in a wide range of use cases and development environments. Application programmers use PDFlib to create PDF output with text, images, graphics and interactive elements.

Vanilla.PDF is a powerful, modern, and open-source PDF processing toolkit designed to provide maximum flexibility while remaining easy to use. Whether you are building a small script or an enterprise-level application, Vanilla.PDF offers all the tools you need to create, modify, sign, and analyze PDF files with precision and efficiency. Our framework supports the entire range of PDF standards, including PDF 2.0 and archival formats such as PDF/A, as well as advanced PAdES electronic signatures with full PKCS#11 hardware token and smart card integration. This ensures compliance with the highest industry and legal standards for document authenticity and integrity. Vanilla.PDF is built with developers in mind — it offers a clean, well-documented API, accompanied by fully-featured examples that showcase practical real-world usage. This means you can integrate it into your projects quickly and reliably, with confidence that the results will meet the market’s highest expectations.