List of the Top 10 Free PDF SDK in 2025

Pdftools offers robust solutions for handling vast numbers of documents, potentially reaching into the millions. Tailored for sectors that heavily rely on documentation, the Pdftools suite of SDKs aims to enhance the speed, simplicity, and overall ease of your document workflows, reducing stress along the way. Built on reliable SDKs and APIs, Pdftools products integrate effortlessly into your current systems and applications. With the capacity to process thousands of documents each minute, our tools prioritize speed and efficiency. As engineers committed to excellence, we ensure that only the most trustworthy, usable, and well-documented platforms are utilized. While file sizes can be minimized, we guarantee that quality and interactivity remain intact. Additionally, our solutions help ensure that your documents adhere to long-term archiving standards. Comprehensive documentation accompanies every aspect of our products, allowing for a seamless onboarding experience. With Pdftools, you can transform your document management approach and unlock new efficiencies.

The pdfRest API Toolkit was crafted by developers for developers, enabling swift integration of PDF workflows into business applications with ease and efficiency. This toolkit encompasses a comprehensive suite of PDF processing tools created by digital document specialists who possess decades of expertise to simplify your tasks: it offers conversions such as PDF to Word, PDF to Excel, and PDF to PowerPoint, along with functionalities like adding to PDFs, text extraction, querying PDFs, converting to various formats, and compressing PDFs. Additionally, it provides features for flattening forms, transparencies, annotations, and layers, as well as merging, splitting, encrypting, decrypting, and watermarking PDFs, along with form data management, OCR capabilities, and file uploads and zipping. Users will find extensive documentation featuring intuitive endpoints and parameters, along with sample code in .NET, JavaScript, Python, PHP, and cURL for every endpoint to facilitate smooth operation. Powered by the renowned Adobe® PDF Library™, it allows users to begin without any financial commitment and offers competitive pricing suitable for projects of any scale. The design of pdfRest emphasizes flexibility, allowing APIs to be accessed from any programming language capable of making API requests, making it a versatile choice for developers aiming to simplify their PDF workflow. Start your journey with your first API call today and experience the ease of PDF management firsthand.

KDAN PDF Reader serves as a comprehensive PDF management solution, allowing users to edit, sign, perform OCR scans, convert, annotate, and fill out forms within PDF documents seamlessly. By incorporating advanced AI capabilities, it enhances the efficiency of your document workflows! Tailored for Mac, iPhone, and iPad users, KDAN PDF Reader is a reliable choice for millions, thanks to its extensive features and user-friendly design. **Spring Sale: Work smarter with KDAN PDF Reader—get 40% OFF Document 365 AI+, our AI-powered, cross-platform subscription. Offer ends May 8. KEY FEATURES EDIT TEXT & PDF • Correct mistakes and typos directly in the PDF - replace, insert, or remove text in documents • Modify images by adding, editing, cropping, and adjusting them within PDFs • Include headers and footers for better organization • Utilize Bates numbering for effective referencing, tracking, and systematic arrangement • Apply stamps or dynamic stamps to convey status, offer feedback, and emphasize key information in the document CONVERT PDF • Offline file conversion - change files without needing an internet connection • Transform PDFs into Office file formats, images, or ePub • Supported formats include docx, xlsx, csv, pptx, rtf, txt, html, jpg, png, BMP, jpg200, pub, and MOBI SIGN & FORMS • Fill out and modify forms as needed • Design fillable forms complete with buttons, checkboxes, and list boxes • Create and apply signatures directly on PDFs • Generate signatures using a trackpad, keyboard, or images EDIT PAGE • Combine and separate PDFs effortlessly • Extract, rearrange, rotate, remove, and crop individual PDF pages • Modify the background color of PDFs for enhanced visibility • Add pages from other documents for comprehensive project management. This makes KDAN PDF Reader not just a tool, but a complete solution for all your PDF needs.

ComPDF is a brand under PDF Technologies (a KDAN company), offering a range of products including ComPDFKit (PDF SDK and Conversion SDK) and ComIDP (an Intelligent Document Processing solution). Developers and businesses can integrate ComPDF products via SDKs, APIs, or low-code platforms to enable powerful PDF functionalities such as rendering, editing, annotation, conversion, form filling, digital signing, document comparison, measurement, redaction, OCR, and data extraction. 1. Product Details of ComPDF: - ComPDFKit PDF SDK Our PDF SDK renders PDFs at the fastest speed and provides rich and reliable functionalities including viewing, markup, content & page editing, digital & electronic signing, form filling, OCR, comparing, measuring, etc., satisfying the needs of processing PDFs in different scenarios. - ComPDFKit Conversion SDK Support Convert PDF to or from Word, Excel, PPT, TXT, RTF, PNG, JPG, HTML, JSON, markdown, searchable PDF, etc. - ComIDP ComIDP is the intelligent document processing, allow companies to integrate for unstructured data extracting, knowledge base building, AI Q&A, image pre-processing, PDF parsing, PDF data extraction, PDF table extraction, etc. 2. Tailored Solutions for Unique Business Demands No matter in construction, education, or any other industry, our specialized solutions streamline your workflows. Whether integrating PDF features into apps or collaborating on PDF editing with teams, we have the ideal solutions tailored for you. - Low-code PDF solution on Make.com, zapier, etc. - Construction - Aviation - Manufacturing - Finance - Education - Printing - Healthcare - Government - Salesforce - Sharepoint - Onedrive - Teams ……

AmindPDF boasts a highly intuitive user interface that simplifies PDF management for users. It has the capability to identify and extract text from PDFs, allowing for direct editing of paragraphs or entire blocks of text in a seamless manner, akin to the experience in MS Word. For enhancing PDF security, users can easily apply passwords, define document permissions, insert signatures, and add watermarks. Additionally, the software supports batch processing, enabling users to execute multiple operations, including merging, splitting, compressing, numbering, and converting various PDF files simultaneously. AmindPDF is compatible with multiple platforms such as Windows, iOS, and Android, ensuring that users can access its features on both computers and mobile devices, thus facilitating PDF editing or processing at any time and place. Users can effortlessly modify PDF text by adjusting attributes like font, size, color, style, and alignment. They can also manage images within PDFs by selecting, replacing, rotating, cropping, or deleting them as needed. Furthermore, AmindPDF allows the merging of multiple PDF or image files into a single PDF, employing the filenames of the combined documents to create a structured outline within the final merged file, enhancing organization and accessibility. This versatility makes AmindPDF an invaluable tool for anyone needing comprehensive PDF solutions.

Anvil is a versatile workflow platform based on embedded logic that enables businesses to efficiently manage a large volume of PDFs, which require completion, generation, maintenance, and signing. This platform allows for a tailored approach to handle diverse PDF-related tasks seamlessly.

FPDF is a PHP tool designed for generating PDF files directly within PHP applications, serving as an alternative to the PDFlib library. The name FPDF reflects its free nature, allowing users to utilize and modify it without limitations to address diverse needs. This library operates without requiring extra PHP extensions, other than Zlib for compression and GD for GIF capabilities, and it is compatible with PHP versions starting from 5.1, extending through PHP7 and PHP8. There is an abundance of tutorials available, making it easy for users to learn how to use FPDF efficiently. Importantly, FPDF accommodates the creation of documents in various languages beyond Western European scripts, including Central, Cyrillic, Greek, and Baltic languages, provided that the necessary TrueType or Type1 fonts are installed. Furthermore, it supports UTF-8 encoding, enhancing its usability for a broader audience. Although the speed of generating documents may not rival that of PDFlib, it remains quite satisfactory for most applications unless highly specific document accuracy is essential. This adaptability and ease of use contribute to FPDF's popularity among developers seeking a reliable and uncomplicated PDF generation tool, ensuring that it remains a valuable asset in the PHP development toolkit.

pdfToolbox offers comprehensive and adaptable PDF processing solutions that can be easily integrated, enabling both rapid visual assessments and the complete automation of extensive file management. Utilizing robust Adobe technology, pdfToolbox proficiently tackles complex challenges, supports color management, facilitates imposition, and enables conversions to and from various PDF formats. This innovative tool is favored by a wide array of users, ranging from small enterprises to large publishing companies and print service providers, including OEMs that embed it into their product lines. The Desktop version acts as a manual tool for PDF preflight and correction, available either as a plug-in for Adobe Acrobat Pro or as an independent application. Tailored for prepress operators, pdfToolbox features a user-friendly interface for all prepress activities, allowing individuals to perform any required task in just three simple steps. Additionally, users can customize their interface to keep their most commonly utilized functions easily accessible, thereby increasing efficiency and optimizing workflows within the printing sector. This adaptability not only enhances productivity but also ensures that professionals can work with greater speed and accuracy, ultimately improving the quality of the final output.

PDFlib GmbH is wholly committed to the evolution of PDF technology, with its products being utilized by customers since 1997. The company played a pivotal role as a founding member of the PDF Association in 2006, which was previously known as the PDF/A Competence Center. This organization actively monitors industry changes and market trends, ensuring compliance with ISO standards for PDF. PDFlib GmbH's products are accessible globally, boasting a substantial presence in Europe, North America, and Japan. Recognized for its development components, PDFlib excels in the creation and manipulation of PDF documents. Its main goals include the dynamic production of PDFs on web servers and through various applications on servers, desktops, and mobile devices. By employing PDFlib, users can generate PDF documents dynamically from databases, similar to how dynamic web pages are created. Since its establishment in 1997, PDFlib has showcased its adaptability across a wide array of use cases and development environments. Application developers utilize PDFlib to create PDF outputs that encompass text, images, graphics, and interactive elements, solidifying its status as an indispensable tool in contemporary document generation. Furthermore, PDFlib's comprehensive features make it a preferred choice among developers in search of efficient PDF solutions, reinforcing its reputation in the industry.

Vanilla.PDF is a user-friendly toolkit designed for handling PDFs, offering exceptional capabilities. This framework accommodates all PDF standards, including PAdES electronic signatures and the PKCS#11 interface. With a comprehensive documentation and a variety of fully-functional examples, users can be confident that their results align with top market expectations. If you have any inquiries or require assistance, feel free to reach out to us without hesitation!