List of the Top 9 On-Prem PDF Converters 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.

Apryse, which was previously known as PDFTron, is transforming the document landscape. It enables precise viewing, annotating, editing, creating, and generating of PDFs across various platforms, including web, mobile, desktop, and server applications. The technology offered by Apryse is compatible with all leading platforms and supports a wide array of file formats, such as PDF, Microsoft Office, and CAD files. By implementing this solution on your own infrastructure, you can manage the entire document and data lifecycle without the need to rely on external server services. This independence allows organizations to enhance their workflows and maintain greater control over their document processes.

Nutrient offers a comprehensive suite of solutions tailored to meet all your PDF needs, providing tools that effortlessly handle PDF functionalities on any platform. 1. SDK: Integrate sophisticated PDF capabilities into iOS, Android, Windows, the web, or any cross-platform technology, offering features such as PDF viewing, annotation, collaboration, and much more. 2. Libraries: Use our robust .NET and Java libraries to empower your backend systems with capabilities for batch processing of redactions and PDF forms, OCR for scanned text, and editing of PDF documents, all directly from your application server. 3. Processor: Our nimble PDF microservice, Processor, facilitates the quick creation of PDFs from HTML, including HTML forms, alongside conversions from Office to PDF, OCR processing, redaction, and the combination and exporting of XFDF. 4. PDF API: Leverage our hosted PDF API to create, convert, and modify PDF documents within your workflows. We manage the development and server operations, allowing you to focus solely on growing your business. At Nutrient, we see ourselves not merely as a tool but as a dedicated partner in your journey to success. You can easily reach out to our engineers for specialized support, access thorough examples to aid in integration, and utilize our premium documentation to maximize your experience. Additionally, we are committed to continuous improvement and innovation, ensuring our solutions evolve with your needs.

Global OEMs, SaaS providers, and enterprise users utilize the Adobe PDF Library to streamline the processes of creating, editing, and managing PDF documents. As an authorized Adobe partner, our SDK is built using the same source code as Acrobat, ensuring top-notch stability, reliability, and quality. Supported programming languages include .NET, .NET Framework, Java, and C/C++, and it is compatible with platforms such as Windows, Linux, and MacOS, with package management facilitated through NuGet and Maven. The library boasts a wide range of capabilities, encompassing annotations, content creation and modification, color management, and various extraction options for text, images, and forms. It also offers features for compression, optimization, and conversion to formats like PDF/A, PDF/X, EPS, PostScript, XPS, and ZUGFeRD, along with robust display and printing options. Moreover, it allows for the import, export, and flattening of both static and dynamic XFA forms, along with AcroForms, and supports a variety of image operations including extraction, rendering, and thumbnail creation. The optimization functionality enhances file size and content, while OCR capabilities enable text addition to documents and images. Additionally, users can convert PDFs to Office formats such as Word, Excel, and PowerPoint, and implement security measures including viewer settings, redactions, password protection, encryption/decryption, and watermarking. Pricing structures are adaptable for OEMs, SaaS solutions, and end-users, based on their specific usage needs. Accelerate your development process and reach the market more swiftly with the Adobe PDF Library; take advantage of the free trial available for download today.

Enhance your application with PDF functionalities by utilizing just two API calls: Open, Edit, and View PDF. With a simple configuration file and these API calls, you can enable your app to swiftly import, view, modify, and open PDF documents within a single day. The SDK is designed to bridge format discrepancies, offering features such as cropping, color management, fills, and font adjustments. It facilitates the conversion of any PDF versions, including the ISO Standard PDF 2.0, allowing for versatility with any PDF file or print-ready document as an input. The conversion process is streamlined, ensuring a smooth experience without any intermediary steps or loss in quality, and it eliminates the need for a printer driver. Compatible with Windows, MacOS, and Linux, the PDF Conversion SDK also supports .NET and comes with sample code for your reference. Additionally, it effectively removes unnecessary data and compresses files, leading to enhanced performance during web and application browsing, making it an efficient choice for developers. By adopting this technology, you can significantly improve the user experience when handling PDF files.

The PDF Xpansion SDK 17 provides a comprehensive suite of features, methods, and capabilities that empower software developers to design applications and solutions that support PDF/A compliance. With an array of tools available for creating, editing, and printing PDF, PDF/A, and XPS documents, users can seamlessly display and print these documents while facilitating conversions and file format exchanges. Additionally, the SDK includes eInvoicing capabilities for ZUGFeRD Factur-X, XRechnung, and Factur-X formats, enabling developers to incorporate EU-compliant electronic billing functionalities that adhere to established standards. This robust framework supports integration into both Windows desktop applications and Windows Apps, offering developers the ability to selectively purchase only the functionalities they need, thus enhancing the SDK’s adaptability and efficiency. Ultimately, this flexibility allows for tailored solutions that meet specific project requirements.

Lua provides a free online tool that allows you to convert PDFs without any downloads required! This platform makes it easy to change PDF files into several formats, including Word DOC, Excel, JPG, PNG, PPT, and HTML, as well as enabling the creation of PDFs from different cloud-based sources. To merge or combine PDFs online, simply adhere to these steps: 1. Click on "Choose PDF Files" to select the PDF documents you wish to merge. 2. The PDF Combiner will immediately start working on merging your files. 3. Give the tool a moment to finish the task. 4. When the process is complete, your chosen PDF documents will be merged into a single unified file. 5. After that, you can download or share the combined document as per your requirements, making it a convenient solution for managing your PDF files.

Converting HTML files into PDFs involves various considerations to ensure top-notch print quality. Whether you are changing a webpage or applying Database Publishing techniques, there are effective ways to transform even complex HTML into PDF format. PDFreactor stands out as a powerful solution for HTML to PDF conversion, featuring a vast array of functionalities that exceed those of many other options, thereby enhancing your overall conversion experience. It allows for seamless conversion from HTML to PDF and provides excellent support for HTML5, CSS3, and JavaScript. This software comes equipped with APIs that are compatible with numerous programming languages, such as JavaScript, Java, PHP, .NET, Python, Ruby, Perl, Node.js, as well as both SOAP and REST protocols, plus an option for a Docker Image. Furthermore, it offers a complimentary personal license, making PDFreactor a superb choice for web applications like Database Publishing, Web-to-Print, PIM, DMS, MDM, DAM, WCMS, and VDP. Typically utilized for server-side HTML to PDF conversions, it can manage everything from documents driven by dynamic data—like reports, invoices, and forms—to producing sophisticated, high-quality PDFs for a variety of applications. By leveraging PDFreactor, users can effectively meet diverse printing requirements while upholding exceptional quality standards. This versatility makes it not only a practical tool but also a valuable asset for professionals looking to streamline their document creation processes.

Autobahn DX is an advanced OCR solution designed to transform searchable PDFs into other searchable PDFs. It accommodates various input formats such as TIFF files, PDF files, and Microsoft Office documents. Many organizations rely on Autobahn DX for extensive bulk processing tasks. Its hot folder functionality enables teams to maintain productivity while the software manages document processing in the background. Additionally, scheduling features ensure timely file pickup and processing, allowing users to focus on their primary responsibilities. The integrated OCR engine enhances document searchability by applying a concealed text layer. Furthermore, the Autobahn.Net API empowers users to develop tailored scripts for specific needs. With a single straightforward action, documents can easily be merged or divided as required. The standard OCR engine supports up to 23 languages, while the Extended engine expands this capability to over 120 languages, catering to a diverse global audience. This versatility makes Autobahn DX an essential tool for businesses aiming to streamline their document management processes.