List of the Top 16 Free PDF APIs 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.

Our web application and API facilitate the effortless creation of PDF documents, including invoices and letters. To get started, prepare your Word template by inserting tags at the locations where you wish to include dynamic content. You can then submit your data in either JSON format or an Excel file. The system will produce a document for every data entry, substituting the tags in the template with the corresponding real data. With robust customization options, businesses can easily generate PDF documents tailored to various needs. After uploading your template, the merge tags are automatically recognized based on its content. Our REST API is designed to help you craft personalized solutions for your organization. You can efficiently generate large volumes of PDF documents, such as contracts and letters, in a single go. Simply use the Generate Document API with your data, and a PDF will be created from the chosen template in a matter of seconds, streamlining your document generation process significantly. Whether you need one document or thousands, our system is equipped to handle your requirements swiftly and accurately.

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. 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.

ComPDFKit provides a high-quality PDF SDK, API, and Server tailored for businesses, organizations, startups, and developers alike. Its platform allows seamless integration of features such as document annotation, editing, conversion, form filling, and signing into various applications or products, which ultimately helps in reducing both time and costs. The software is versatile and works across multiple operating systems, including Windows, Web, Android, iOS, Mac, and Linux, as well as supporting cross-platform frameworks like React Native, Flutter, and Electron with minimal coding effort. Recent updates from ComPDFKit include the following enhancements: 1. ComPDFKit API Register now to receive 1000 free file processing each month, allowing for comprehensive editing and converting of PDF documents, as well as functionalities such as splitting, merging, inserting, rotating, deleting, and extracting PDF pages, alongside OCR processing. 2. Free Online Tools Utilize ComPDFKit's online tools to effortlessly convert PDF files to and from various formats, including docx, xlsx, pptx, png, jpg, html, txt, csv, and rtf. 3. Web Demo Explore the online demo to view, edit, annotate, compare, sign, encrypt, decrypt, watermark PDFs, and create or fill out PDF forms at no charge. 4. Community License Start-up companies and individual developers can benefit from competitive pricing options through ComPDFKit, helping you to develop customized applications while enjoying exclusive discounts and offers. Additionally, the user-friendly interface and comprehensive support further enhance the experience for developers looking to leverage PDF functionalities in their projects.

Transforming a webpage into a PDF is now simpler than ever with PageToPDF @ Aypeye. Our cloud-based PDF converter offers a quick and efficient way to generate high-quality PDF files from any website, all at no cost to users online. Moreover, PageToPDF features an API designed for bulk conversions, making it an excellent choice for users who need to convert several webpages simultaneously. Simply provide the URL of the page you wish to convert, and our cutting-edge software will create a polished PDF document in no time. This PDF generator caters not only to professionals aiming to archive key online content for future reference or to share with clients but also to students who require saving articles for their research or studies. One of the most appealing aspects of PageToPDF is its flexible pricing structure; there are no recurring fees or contracts involved. Instead, we operate on a Pay As You Go basis, allowing you to pay solely for the services you utilize, making it both convenient and economical. In today's fast-paced digital environment, having such a tool at your disposal is invaluable.

PDFMonkey offers a powerful solution for all your PDF generation needs. Utilizing modern web technologies alongside a user-friendly REST API, crafting beautiful documents is easier than ever before. Don’t waste precious time! Streamline your development process since there's no requirement to write lengthy code for generating PDFs, tackle complex setups, or wade through dependency challenges. We handle all the complexities for you, enabling you to concentrate on what really counts. Experience the simplicity of document creation with PDFMonkey now and transform the way you generate PDFs!

Explore an all-encompassing toolkit that is specifically crafted to guarantee the success of your projects: it boasts a variety of features such as image resizing and CDN services, as well as tools for PDF and screenshot generation, currency exchange, discount management, email validation, and QR code creation, to name just a few! Our cutting-edge color generator allows you to easily produce unique shades from textual input, effortlessly switch between HEX, RGB, and HSL color formats, and develop color palettes that are inspired by a chosen color or text prompt. Image manipulation is simplified with this API, enabling you to customize and deliver images seamlessly via a Content Delivery Network. You can also easily compute readability scores, approximate reading durations, and evaluate the sentiment of any text you provide. Create perfect QR codes in both image and vector formats that can be customized to meet your needs, making them ideal for advertising events, presenting discounts, or sharing links. Moreover, you can access detailed insights about a Spotify profile, which includes their name, follower statistics, popularity metrics, profile picture, monthly listeners, biography, social media links, top tracks, and the locations of their most loyal listeners, rendering this toolbox an essential asset for any endeavor. With functionalities tailored for both developers and marketers, this API equips you with all the necessary tools to enhance your projects and effectively connect with your audience in a meaningful way. By integrating these features, you’ll find your workflow transformed, making it easier than ever to achieve your goals.

WebPDF is a versatile online platform that simplifies the process of modifying PDF documents. Through its user-friendly web interface, users can perform various tasks, while a robust API is available for developers looking to integrate these functionalities directly into their applications. The operations you can execute include merging several PDFs, splitting documents, compressing files, extracting metadata, flattening forms, and retrieving images and text from PDFs. Additionally, users can lock or unlock documents, apply optical character recognition (OCR), adjust file sizes and versions, add watermarks, and optimize PDFs for web use. Numerous other tools are also offered, with even more features anticipated in future updates. Best of all, WebPDF allows you to explore these capabilities at no cost, making it accessible even without creating an account. This makes it an excellent choice for anyone needing flexible PDF solutions.

Our application programming interfaces (APIs) simplify the automation of document processing within your software solutions. Each API is capable of handling input documents, whether they are images or PDFs, and provides a well-organized response containing all necessary information. With instant processing, users benefit from an optimal experience. You can expect high-quality outputs regardless of the initial image clarity. This approach yields structured data without the need for any further processing. To assist developers in crafting powerful APIs that are user-ready, we leverage cutting-edge advancements in deep learning. Our innovative algorithms identify pertinent information in images prior to analysis, setting us apart from conventional optical character recognition (OCR) methods. This modern approach dismantles the traditional limitations of OCR in terms of speed, precision, and reliability. There's no need for training, templates, or lengthy setups. Developers can easily integrate our APIs through a plug-and-play system. Our platform is designed with an API-first mentality, catering specifically to developers. Additionally, a free plan is available for developers, requiring no credit card information. These APIs operate in a synchronous cloud environment, ensuring efficient and effective processing. Overall, our solutions aim to revolutionize how document processing is approached in software development.

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.

DynamicDocs API is a robust JSON-to-PDF solution built on LaTeX that enables the generation of bulk PDF documents while seamlessly incorporating elements such as tables, graphs, logic, and charts into the templates. This API empowers users to either design their own templates or leverage pre-existing JSON-to-PDF templates with no need for LaTeX expertise. Furthermore, DynamicDocs API ensures that the resulting PDFs are of exceptional quality, dynamic in nature, and optimized for web use, making it a versatile tool for document creation. Users can enjoy the flexibility of customizing their documents to fit specific needs without the complexity typically associated with PDF generation.

An efficient, reliable, and easy-to-use API designed for converting HTML into PDF format. PDFShift acts as a powerful resource for changing HTML and CSS files into top-notch PDF documents, allowing developers to effortlessly automate their document conversion tasks while minimizing ongoing maintenance costs. With this API, users are guaranteed access to the most current features and upgrades, which significantly boosts productivity in their workflows. Additionally, the straightforward integration process makes it an ideal choice for developers seeking to streamline their operations.

An open-source REST API enables users to generate, modify, and oversee PDF documents through programming techniques. This service offers various functionalities such as the ability to rotate and remove pages, apply password security, compress files, and execute tasks in the background. It stands out as an excellent resource for developers seeking to work with PDFs effortlessly. Access to this API is completely free, requiring only an API token for usage. Additionally, the flexibility it provides can significantly enhance productivity in managing PDF workflows.

PDFBolt is a robust API designed for converting HTML to PDF, making it an ideal solution for businesses and developers seeking to generate high-quality PDF documents effortlessly. This developer-centric API delivers pixel-perfect PDFs that comply with GDPR regulations in mere seconds. Key Features: - Instantaneous conversion of HTML and URLs to PDF format. - Flexible PDF layout customization, including options for headers, footers, margins, and overall page formatting. - Secure processing that adheres to GDPR standards. - Support for both synchronous and asynchronous API requests. - Integration capabilities with webhooks and direct uploads to S3. - A comprehensive dashboard for tracking usage, managing API keys, and reviewing detailed logs. - Extensive documentation alongside responsive customer support. - Free Forever Plan allowing up to 500 PDFs each month. PDFBolt: Streamline your PDF generation without any hassle or complex setup! Enjoy the simplicity of creating PDFs effortlessly!

An innovative API platform is specifically crafted for the intelligent extraction of data from PDF documents, enabling automated parsing of various files. This system allows users to develop reusable low-code templates for data extraction, accommodating multiple languages for OCR alongside tables and fields. It incorporates a built-in invoice parser and offers a range of functionalities such as splitting, merging, reordering, and removing pages from PDF files. Advanced splitting tools enable users to fill out PDF forms and seamlessly add text, images, and signatures to existing documents. Furthermore, it supports auto-filling for interactive fields and can generate PDFs from HTML templates, incorporating conditions, variables, and custom logic as needed. Users benefit from high-quality PDF output with comprehensive control over the production quality, ensuring both security and scalability in their operations. The PDF extraction engine efficiently converts documents into various formats, including raw JSON, CSV, XML, XLS, and XLSX, while retaining the original layout and effectively extracting tables. Additionally, the platform's OCR capabilities not only repair malformed text but also extract multiple types of barcodes, such as QR Codes, Code 128, Code 39, DataMatrix, and PDF417 from PDFs, scans, and images, all powered by an advanced barcode reading engine. With such a broad array of features, this platform is positioned as a comprehensive solution for addressing all PDF-related data extraction requirements, making it an invaluable tool for businesses and individuals alike.