Best On-Premises PDF APIs

Add a fully functional PDF editor to your ASP.NET website in minutes! Compatible with 99% of desktop & mobile browsers, from Internet Explorer 6 through the latest iOS Safari release, RAD PDF simply works. No plugins or other software needed. RAD PDF natively supports the most commonly used PDF features. Beyond a PDF reader, RAD PDF equips web applications with a browser-based PDF editor & PDF annotator. Features not even available in Adobe Acrobat Reader can be used to provide advanced PDF functionality. By enabling PDF form filling, PDF redaction, & PDF signing directly in the web browser, RAD PDF users can utilize PDF features without worrying about having the right platform or software installed! Allow your app to design new PDF forms, protect content, sign PDFs, & more using an intuitive graphical user interface (GUI). Client (JavaScript) and server APIs allow for endless possibilities .NET Core, Framework, & .NET 5+ supported Try editing any PDF with RAD PDF, FREE!

Nutrient DWS is a cloud platform of document APIs: Processor for headless document workflows (generation, conversion, OCR, redaction), Data Extraction for structured data from any document, AI Gateway for managed access to generative and decision models through flexible APIs, Viewer for embedding document viewing and review in your app, and Accessibility for PDF/UA tagging and validation — all without managing infrastructure.

MindCloud connects PDF and document-processing APIs with applications where documents and their data are created, stored, and used. Automate PDF generation, data extraction, file conversion, document transfers, and routing into CRM, ERP, accounting, storage, or operational systems. MindCloud orchestrates the workflow while the connected PDF service performs the document operation.

Through a collection of UI components and content manipulation APIs, PrizmDoc provides customizable document processing to help developers deliver in-browser document creation, editing, and collaboration functionality, to enhance their software applications. Our functionality integrates on the client and server side smoothly, creating a seamless experience for both you and your users. Render and display dozens of file types, from Adobe PDFs and Microsoft Office files to CAD and DICOM formats, in a browser without the need to download or open native applications. Designed for seamless integration with your application, our zero footprint HTML5 viewer is fully customizable, from quick integrations with minimal configuration to complete programmatic control using our extensive JavaScript API.

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.

pdfRest is a REST API for high-volume PDF processing, built on the Adobe PDF Library. Call it from any language to convert, generate, extract, secure, and prepare PDFs in production pipelines, chaining calls by passing a resource ID between steps. Convert Office, HTML, images, email, and Markdown to PDF, and PDF to Word, Excel, PowerPoint, images, Markdown, PDF/A, PDF/X, and PostScript. Generate PDFs from scratch with text, images, shapes, and attachments, with accessibility tagging. Extract via OCR, text/image extraction, form data, metadata, AI summarization, translation. Secure with signing, encryption, restrictions, watermarking, two-step redaction, and TDM Reserve to opt out of AI training. Handle prepress: color conversion, transparency flattening, page boxes, rasterization. Manage forms: import/export, flatten, XFA-to-AcroForm. Deploy on pdfRest Cloud (US or EU) or self-host via Docker, Kubernetes, or AWS Marketplace (BYOL) — same API, same code, just change the base URL.

Add PDF Features with 2 API Calls Open, Edit, and View PDF. All that's needed is two API calls and a configuration file. Within a day, you can add, open, import, edit and view PDF features in your app. When formats don't match one-to-one, the SDK neutralizes the differences. This includes adding cropping, fills, color management and fonts. The PDF Conversion SDK processes all PDF versions including ISO Standard PDF 2.0. Any PDF from file or print-ready memory is valid input. Conversions flow straight through without intermediate steps or compromised quality. No printer driver. The PDF Conversion SDK runs on Windows, MacOS and Linux. It supports .NET. Example code included. Removes redundant information & compresses data. This ensures great performance for fast web and application viewing. Search for objects and text strings. Convert PDF to your native file format. Change the contents of a PDF page. Extract images from PDF. Retrieve metadata from PDF (layers, geospecification, etc).

PDFGate is a document automation platform focused on electronic signatures, PDF generation, and document processing. Businesses can prepare and send documents for legally binding electronic signatures, assign recipients and fields, track signing progress, reuse templates, send automatic reminders, and maintain detailed audit records. Recipient email verification and consent records help support secure and traceable signing workflows. PDFGate also includes tools for automated PDF generation and processing. Businesses can generate PDFs from HTML, URLs, templates, and application data, and use features such as fillable PDF fields, form data extraction, flattening, watermarking, compression, encryption, and password protection. PDFGate can be used directly through its dashboard or integrated into existing systems using APIs and SDKs. This makes it suitable for both teams that want a straightforward signing workflow and companies that need to automate document creation, processing,

Aquaforest SDK is a powerful toolset for processing PDFs including PDF content extraction, searchable PDF creation, OCR with standard (Aquaforest) engine, OCR with extended (Canon IRIS) engine, and handwriting OCR options via Google and Microsoft APIs. Advanced PDF and barcode toolkit, high performance with support for up to 64 cores. The SDK is able to analyze PDF documents and automatically extract name/value pairs. The SDK has a wide variety of PDF manipulation capabilities including PDF merging, PDF attachment processing, PDF content extraction, XMP metadata processing, PDF/A validation, and more. The standard OCR engine supports 23 languages and is included in every edition of the SDK. This provides an interface to Google and Microsoft’s cloud OCR services which can be especially useful for special cases such as handwriting recognition. The SDK is able to read and recognize most standard barcode types.