Best Web-Based PDF APIs of 2025

Pdftools can help you process thousands of documents, or even millions. The suite of SDKs from Pdftools is designed for industries that are document-intensive. They will make your document workflows faster, easier, and less stressful. The Pdftools products are built on SDKs or APIs. They integrate seamlessly with your existing systems and applications. Process thousands of documents per minute. Our tools are designed to be fast and efficient. We are engineers at heart and only accept the most reliable, usable and well documented platforms. File sizes can be reduced, but quality and interactivity are not compromised. Your documents will be compliant with long-term archiving. We have documented every detail of our products so that you can easily get started.

Our API and web application allows you to easily generate PDF documents such as invoices, letters and other documents. Prepare your Word template by adding tags to the places where you would like dynamic text. Then, provide the data in JSON or an Excel file. The template will generate a document for each data item by replacing the tags in the template with the actual data. The advanced customization features can help your business create PDF documents for any application with minimal effort. The merge tags are detected automatically after uploading the template based on its content. Our REST API allows you to create personalized experiences for your company. Generate thousands of PDF documents in bulk, such as invoices, letters and contracts. Call the Generate Document API with your data, and within seconds a PDF document will be created from the specified template.

Install-free PDF editing, form filling, redaction, signing, viewing, and more on your website with RAD PDF! Packaged as an easy to use library / WebControl (compatible with .NET 3.5+, .NET Core, and .NET 5+), RAD PDF can be used with just about any flavor of ASP.NET including MVC, Razor, Blazor, WebForms, and more. RAD PDF is compatible with 99% of internet browsers, including those on Linux, Mac OS X, Microsoft Windows, and mobile. No plugins. No Adobe Reader. RAD PDF is more than a PDF to HTML converter. It natively supports all the most common PDF features including annotations, bookmarks, form fields, page labels, and more. With advanced PDF options, RAD PDF allows you to selectively enable and disable features not available with Adobe Acrobat Reader, like protecting a PDF from being downloaded while still viewable online. RAD PDF users can use PDF form fields directly from the web browser by enabling PDF form filling and PDF form saving without having to install any software. Integrating directly with ASP.NET, RAD PDF allows your web application to capture input data, build custom workflows, and provide an intuitive graphical user interface (GUI) for just about any online PDF interaction imaginable!

Nutrient provides an extensive solution for all your PDF requirements, delivering tools that seamlessly operate PDF features across any platform. 1. SDK: Incorporate advanced PDF functionality into iOS, Android, Windows, web, or any cross-platform technology, supplying abilities like PDF viewing, annotation, collaboration, and beyond. 2. Libraries: Employ our powerful .NET and Java libraries to enhance your backend applications with batch processing of redactions and PDF forms, OCR'd scanned text, and PDF document editing, all directly from your application server. 3. Processor: Our agile PDF microservice, Processor, enables rapid generation of PDFs from HTML, including HTML forms, as well as Office-to-PDF conversions, OCR, redaction, and XFDF combining and exporting. 4. PDF API: Take advantage of our hosted PDF API to generate, convert, and alter PDF documents in your workflows. We handle the development and server management, freeing you up to concentrate on your business. At Nutrient, we're not just a tool; we're a committed ally in your success. Gain direct contact with our engineers for expert guidance, utilize comprehensive examples to simplify integration, and make the most of our top-tier documentation.

MindCloud is not only a modern iPaaS but also provides a full service solution for small and medium sized businesses that doesn't require you assigning technical staff to the project. We have over 50 pre-built connectors and can add any new software platform that has an API or allows automated import/exports. We also support EDI and FTP integrations. Some of our features connectors are: Salesforce, Monday.com, Hubspot, QuickBooks Desktop, QuickBooks Online, Method:CRM, Zapier, Walmart, Amazon, Overstock, Ebay, Groupon, Mercado Libre, HSN, Airtable, Google Sheets and many, many others. Automate all of your business process with MindCloud. Eliminate double data entry. Integrate your business. Simplify your life.

PrizmDoc helps web developers embed secure secure and responsive HTML5 document viewing, document editing, and native spreadsheet viewing and editing within your own web application or system solution. Due to its extreme flexibility, PrizmDoc can be supported on virtually any platform, and in any programming language that supports REST API calls. Key features can be easily turned on or off depending on your application’s needs, along with user-based permissions to protect proprietary logic, and you can customize the UI layout or style. PrizmDoc can be self-hosted on your own infrastructure or accessed through a fully managed backend on Accusoft’s public or private cloud. And with best-in-class support, Accusoft’s Enablement Services to ensure a seamless PrizmDoc implementation.

pdfRest API Toolkit was made by developers, for developers. Rapidly integrate PDF workflows with your business applications, simply and seamlessly. pdfRest API Toolkit includes all the PDF processing tools you'll need, designed and developed by digital document experts with decades of experience to make your job easy: PDF to Word, PDF to Excel, PDF to PowerPoint, Add to PDF, Extract Text, Query PDF, Convert to PDF, PDF to Images, Convert to PDF/A, Convert to PDF/X, Compress PDF, Linearize PDF, Flatten Forms, Flatten Transparencies, Flatten Annotations, Flatten Layers, Merge PDFs, Split PDF, Encrypt PDF, Decrypt PDF, Restrict PDF, Watermark PDF, Import Form Data, Export Form Data, OCR PDF, Upload Files, Zip Files. Clear documentation with intuitive endpoints and parameters. Start with sample code in .NET, JavaScript, Python, PHP, and cURL for every endpoint. Gold-standard processing powered by Adobe® PDF Library™. Free to get started with no commitment. Affordable pricing for projects of all sizes. pdfRest was designed for developers, by developers to make working with PDFs as easy and intuitive as possible. Flexible APIs can be called from any language capable of making an API request. Send your first API call in

Add robust PDF features to your apps with the easy-to-integrate MuPDF SDK/ The small yet fast viewer supports a number of document formats including PDF, XPS, OpenXPS, CBZ, and ePUB. The renderer is designed for high-fidelity anti-aliased graphics and renders text with metrics and spacing accurate to within fractions of a pixel. The PDF library includes interactive features such as annotations, form filling, digital signatures, redactions, and search. The command-line tools provide users myriad customization options for rendering and converting documents, and manipulating PDF files. MuPDF supports document conversion to other formats including HTML, SVG, and CBZ. In addition to the C library, there's a Java library using JNI that works for both Oracle's Java and Android. In addition to the Java API, C++ and Python bindings have been developed. MuPDF supports most of the major coding environments and operating systems. It is highly flexible and optimized for each unique platform. MuPDF API has been used as the PDF engine in a variety of deployments ranging from Android and iOS mobile applications, SaaS and cloud solutions, document management programs, and embedded products, to name a few.

Watermark PDF, Add to PDF, Query PDF, Convert to PDF, PDF to Images, Convert PDF Colors, Convert to PDF/A, Convert to PDF/X, Compress PDF, Linearize PDF, Flatten Annotations, Flatten Layers, Flatten Transparencies, Merge PDFs, Split PDF, Encrypt PDF, Decrypt PDF, Restrict PDF, Extract Text, OCR PDF, Upload Files, Zip Files. Our RESTful API is ready for production, so you don't have to reinvent the wheel when creating your own products and solutions. You have full control over your backend infrastructure. Our private cloud service allows you to control the entire process, including the documents. pdfRest API Toolkit Self-Hosted can be set up in just a few clicks from the AWS Marketplace. You can self-host a production-ready server to integrate the API in your own service or to automate your internal document workflow. Pay-as-you go pricing. Many business applications require complete ownership of your backend with very little or no communication with outside servers. You can create an EC2 instance to host our API, which will give you complete ownership of all files on your server.

ComPDFKit PDF SDK is a product of ComPDF, offers a top-quality PDF SDK and PDF API for companies, organizations, small businesses, and developers. It enables you to integrate PDF document annotation, editor, conversion, form filling, and signing into your applications or products, saving you time and expenses. ComPDFKit is compatible with Windows, Web, Android, iOS, Mac, Linux, and other cross-platform frameworks such as React Native, Flutter, and Electron with just a few lines of code. 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.

Add PDF Features with 2 API calls Open, Edit, View PDF. Two API calls and a configuration file are all you need. In less than a day, your app can import, view, edit, and open PDF features. The SDK can be used to neutralize differences between formats. This includes cropping, fills, color management, and fonts. The PDF Conversion SDK can convert all PDF versions, including ISO Standard PDF 2.0. Any PDF file or print-ready memory can be used as input. Conversions are seamless without any intermediate steps or compromises in quality. No printer driver. The PDF Conversion SDK works on Windows, MacOS, and Linux. It supports.NET. Included is an example code. Removes redundant information & compresses data. This provides great performance for web and application browsing.

With PageToPDF @ Aypeye, converting a web page or website to PDF has become easier than ever before. Our SaaS cloud-hosted PDF converter is capable of quickly and easily converting any webpage into a high-quality PDF file, and it is completely free to use online. In addition, PageToPDF also provides an API for bulk PDF conversion, which is ideal for those who need to convert multiple webpages at once. All you have to do is enter the URL of the webpage you want to convert, and our advanced software will automatically generate a professional-looking PDF document for you. Our PDF generator is perfect for professionals who need to save important web content for reference or sharing with clients, as well as for students who need to save online articles for research or study purposes. The best part? There are no monthly fees or contracts. PageToPDF is a Pay As You Go model, which means you only pay for what you use.

A PDF library to create, edit, display, and print Acrobat PDF documents. The PDF API is small and fast. It is easy to integrate into your projects and is written entirely in Java. The API has been designed so you don't need to know the PDF specification in order to create PDFs. We hide as much of the gory details as possible but still give you almost complete control over the PDF itself. Where possible we re-use standard Java classes - for example the pages are stored in a java.util.List, which can be manipulated any way you like (so moving pages from one document to another is a breeze). This means an API which is smaller and easier to remember. The Viewer Extension allows PDFs to be parsed and converted to bitmaps for display, to be saved as a bitmap image (e.g TIFF) or for printing. Although Java 5 theoretically supports printing PDFs out of the box, results are often poor and support for features like annotations, encrypted documents etc. is incomplete. Our PDF library fills this gap, giving consistent results for all PDFs.

DocSpring simplifies the process for developers to create and complete PDFs effortlessly. By offering a user-friendly visual PDF template editor alongside a PDF filling API, it enables users to populate PDFs through a straightforward API request. Uploading a PDF template allows for automatic field importation if the document includes fillable forms, streamlining the setup process. With the intuitive drag-and-drop functionality in our visual template editor, programmers can easily arrange their fields and customize their types, conditions, and display settings. After configuring their templates, a simple POST request can be dispatched to generate a completed PDF with just a few lines of code. The system ensures that the data sent via API requests corresponds accurately to the fields in the PDF templates, minimizing the risk of accidental deletions or incorrect data submissions. Supporting an extensive variety of field types—including barcodes, QR codes, images, and signatures—DocSpring allows for comprehensive form completion and signing capabilities. Additionally, users can create web-based forms directly from the fields in their PDF templates, broadening the possibilities for digital interactions. This versatility makes DocSpring an invaluable tool for any developer aiming to enhance their PDF handling capabilities.

Anvil offers businesses that need to handle a large number of PDFs—whether for filling, generating, maintaining, or signing—a flexible and customizable workflow platform that is embedded and driven by logic. This solution allows organizations to efficiently manage their document processes while ensuring a streamlined user experience.

GdPicture.NET PDFSDK is an intuitive API that allows you to create fully-customizable apps for any software development. Your applications can now have a fully-featured and customizable viewer. This viewer is available for all platforms and displays complex files immediately with a clear rendering and full Unicode support. All versions of PDF and pdf/A as well as 100+ document, office and image formats. You can add thumbnails, annotations and signatures. Redaction, encryption, text search and more. GdPicture.NET PDFSDK allows you to create compliant, structured, and secure PDF files (all versions, including PDF 2.0). You can even create accessible PDFs using PDF/UA generation features. You can make your PDFs available for long-term archiving using PDF/A compliance, or you can generate PDF files for the Web using linearization. You can also add layers and transparency to other contents.

Utilize our HTML to PDF API to effortlessly generate PDFs from web pages or HTML content. Allow your users to convert web pages to PDFs with just one click! Transform entire websites into PDFs seamlessly! Join a multitude of satisfied customers who have been creating top-notch PDFs since 2008! You can swiftly convert any URL or raw HTML into an impressive PDF document. Our REST API is compatible with any programming language and is equipped with a variety of features, including customizable layouts, headers, footers, watermarks, encryption, and more. Simply integrate a "save as PDF" link or button on your web pages, enabling your visitors to download content as a PDF with ease. You have the flexibility to manage numerous layout options and personalize headers and footers. Capture your whole website as a PDF for copyright protection or other reasons. Just input the URL, and we will compile all the pages of the site into a single PDF file. While you enjoy a coffee break, we'll handle the rest and notify you via email when the process is complete, ensuring convenience all the way through!

Generate and manage PDF files with ease by utilizing features such as splitting, appending, stamping, encrypting, extracting, and filling. PDFKit.NET is a fully managed .NET class library designed for the creation and manipulation of PDF documents, packaged as a single assembly that allows for straightforward xcopy deployment. It operates independently with no additional requirements beyond the .NET framework itself. At the heart of PDFKit.NET lies a coherent and user-friendly object model comprising various classes like document, page collection, page, canvas, shape, bookmark, annotation, and field. The development team's primary goal is to simplify the integration of this class library into larger applications. With PDFKit.NET 5.0, users can fill in text fields, checkboxes, and radio buttons, while also having the option to save the forms in either an editable state or as a flattened PDF. Additionally, this version introduces the ability to handle dynamic XFA documents through the new XFA processor API, enhancing functionality. Furthermore, PDFKit 5.0 enables users to extract all graphics from a page, compiling them into a collection of various shapes, which can include text, images, and curves, providing versatile options for document manipulation. This makes PDFKit.NET an invaluable tool for developers looking to incorporate robust PDF handling capabilities into their applications.

PDFMonkey provides an effective way to meet your PDF generation requirements. With the use of web technologies and a straightforward REST API, creating stunning documents has never been simpler. Don't let valuable time slip away! Reduce development efforts as there’s no longer a need to write extensive code for PDF creation, deal with complicated configurations, or navigate through dependency issues. We take care of all the intricate details on your behalf, allowing you to focus on what truly matters. Embrace the ease of document generation with PDFMonkey today!

Setting up and managing a PDF backend can be a cumbersome and lengthy process. With Paperplane, you can quickly integrate PDF capabilities into your application, allowing you to focus on what truly counts. For those handling batch tasks, Paperplane enables the creation of as many as 20 PDFs simultaneously, giving you the freedom to enhance your workflow and produce more documents efficiently. Its asynchronous API allows you to initiate PDF jobs without needing to monitor long-running processes until completion. Additionally, webhooks will keep you informed about any issues that may arise during the PDF creation process. If you’re in search of a method to generate PDFs from your single-page application, rest assured that if your site functions in Chrome, it will also operate seamlessly with Paperplane. You can even opt to delay PDF generation until a specific element appears on the page, ensuring that all your content is fully loaded before the process begins. This flexibility enhances user experience and reliability, making Paperplane a valuable tool for developers.

The PDF Generator API makes it straightforward to create PDF documents using established templates alongside JSON data. It empowers your users to produce PDFs and oversee their document templates through an intuitive browser-based drag-and-drop PDF editor, which helps lower both development and support expenses. With our platform, you have the capability to establish distinct workspaces for individual users, enabling them to store and manage their templates effectively. Each time an API request is made with a new workspace identifier, a new workspace is generated automatically. Users can also write mathematical and logical expressions to adjust and personalize the values shown in the various components. The API supports a wide range of operators, including ternary, arithmetic, bitwise, and comparison operators, along with functions for summing, joining, and iterating through arrays. Various components such as Text, Table, and Barcode can be utilized, allowing for precise formatting of numerical and date values. Furthermore, it facilitates the grouping, filtering, and sorting of lists and tables without necessitating any alterations to the data set within the software application, enhancing overall efficiency and user experience. This feature-rich API ensures a seamless and dynamic document management process for all users involved.

Discover a comprehensive toolkit designed to help ensure the success of your projects: it offers features like image resizing and CDN services, PDF and screenshot generation, currency exchange options, discount management, email validation, and QR code creation, among others! With our innovative color generator, you can effortlessly create a distinctive shade from text, convert colors between HEX, RGB, and HSL formats, and generate color palettes inspired by an initial color or text input. Image manipulation becomes a breeze with this API, allowing for easy customization and delivery of images through a Content Delivery Network. Effortlessly calculate readability scores, estimate reading times, and assess sentiment for any given text. Generate flawless QR codes in both image and vector formats that are fully customizable and simple to create, perfect for promoting events, offering discounts, or sharing links. Additionally, you can retrieve detailed information about a Spotify profile, including their name, follower count, popularity, profile picture, monthly listeners, biography, links to social media, top songs, and the geographical locations of their most dedicated listeners, making this toolbox an invaluable resource for any project. Whether you're a developer or a marketer, this API provides everything you need to elevate your work and engage your audience effectively.

WebPDF is an online service that provides an easy an accessible way to alter PDF files. You can do any of the following operations using the web interface, but there's also a developer friendly API that you can integrate into your own application: Merge multiple PDFs Split PDF Compress PDF Extract PDF metadata Flatten PDF forms Extract images from PDF Extract text from PDF Lock & Unlock PDF OCR PDF Change PDF size Change PDF version Watermark PDF Optimize PDF for web Etc. There are many other tools not mentioned here and lots more to be released. You can try WebPDF for free, even without an account.

PDFGate is a robust and secure HTML to PDF conversion service designed for developers who need fast and reliable document generation. Using a Chrome-based rendering engine, it supports complex web content including HTML, CSS, JavaScript, and custom fonts, ensuring pixel-perfect PDF outputs. The service offers strong security measures such as 128-bit encryption and fine-grained permissions to protect sensitive documents. Its RESTful API enables easy integration into any platform or programming environment, allowing users to generate PDFs within minutes. PDFGate also provides customizable PDF features including paper size, headers, footers, and margins to tailor documents to specific needs. Teams can collaborate securely with role-based access control, and developers can test their implementations using a dedicated sandbox API. Pricing plans scale from personal use to enterprise needs, with predictable overage fees for extra conversions. The platform offers a 7-day free trial and does not store user data by default, ensuring privacy and control.

Gain comprehensive management of your documents through rapid, lightweight APIs tailored for enterprise applications. Effortlessly create, load, modify, save, and handle XLSX spreadsheets, PDFs, images, and DOCX files using programming languages like C# .NET, VB.NET, or Java. Experience seamless viewing, editing, printing, form-filling, and submission of documents with the JavaScript PDF Viewer and PDF Editor. These solutions are compatible with Windows, macOS, and Linux operating systems, eliminating any reliance on Excel, Word, or Acrobat. You can deploy these tools across various cloud services, including Azure and AWS, as well as AWS Lambda. The products are offered individually or as part of a comprehensive bundle. Specifically, the .NET 6 Document API is engineered to produce large, efficient documents quickly while maintaining a lightweight and adaptable structure, thus providing you with enhanced flexibility and creativity in application development. With a unified code base, you can develop for any .NET platform or major operating system, including .NET, C#, VB.NET .NET Framework, Mono, Xamarin.iOS, and Xamarin.Android, ensuring a versatile development experience. Moreover, the API's efficiency allows developers to optimize their workflows and achieve better performance in their applications.