Compare the Top Free PDF APIs as of June 2025

What are Free PDF APIs?

PDF APIs are software interfaces that enable developers to integrate PDF-related functionality into their applications or websites. These APIs allow for the creation, manipulation, conversion, and extraction of content from PDF files without requiring users to manually open or edit the files. Common features of PDF APIs include merging, splitting, editing text, adding annotations, and extracting text and images. They can also handle PDF conversions, such as converting PDFs to other formats like Word, Excel, or HTML, and vice versa. By using PDF APIs, businesses can automate document workflows, enhance document management systems, and integrate PDF capabilities into custom applications seamlessly. Compare and read user reviews of the best Free PDF APIs currently available using the table below. This list is updated regularly.

  • 1
    Pdftools

    Pdftools

    PDF Tools

    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.
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    Starting Price: $0/month/user
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  • 2
    DocuGenerate

    DocuGenerate

    DocuGenerate

    Easily generate PDF documents like invoices, letters, contracts, agreements, certificates and more with our API and web app. Prepare your Word template with tags where you want to have dynamic text. Then provide the data as JSON or in an Excel file. For each data item, a document will be generated from the template by replacing the tags with the actual data. The advanced customization options can help your business generate PDF documents for any use case with minimal effort. After uploading the template, the merge tags are automatically detected based on the template content. Create personalized experiences for your business using our REST API. Generate in bulk thousands of PDF documents like invoices, letters, contracts, agreements, certificates, and more. Simply call the generate document API endpoint with your data and in a few seconds a document will be generated from the specified template, ready for use in your own application or workflow.
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    Starting Price: $19 per month
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  • 3
    pdfRest

    pdfRest

    Datalogics Inc.

    pdfRest API Toolkit was made by developers, for developers. Rapidly integrate PDF workflows with any business application, simply and seamlessly. pdfRest API Toolkit includes all of the PDF processing tools you'll need, to make your job easy. PDF to Word, PDF to Excel, PDF to PowerPoint, Add to PDF, Query PDF, Extract Text, 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, Convert PDF Colors, OCR PDF, API Polling, Upload Files, Zip Files. Get up and running fast with the pdfRest Postman Collection or start from functional sample code in .NET, JavaScript, Python, PHP, and cURL from the pdfRest GitHub repository. Gold-standard processing powered by Adobe® PDF Library™ ensures the highest quality results. Free to get started with no commitment.
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    Starting Price: $0 per month
  • 4
    ComPDFKit PDF SDK

    ComPDFKit PDF SDK

    PDF Technologies, Inc.

    ComPDFKit PDF SDK offers a top-quality PDF SDK and PDF API for developers or companies. It allows them to integrate PDF editing, annotating, converting, form filling, digital signing, comparing, measuring, and redacting into any device. 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.
  • 5
    PageToPDF
    Converting a Web Page or Website to PDF for Free Online has never been easier than with PageToPDF @ Aypeye. Our SaaS cloud-hosted PDF converter can quickly and easily convert any webpage into a high-quality PDF file. PageToPDF also offers an Application Programming Interface (API) for bulk PDF conversion. Enter the URL of any webpage and our advanced software will automatically convert it into a professional-looking PDF document. Our PDF generator is perfect for professionals who need to save important web content for reference or sharing with clients. It's also ideal for students who need to save online articles for research or study purposes. There are no monthly fees or contracts. Page To PDF is priced as a Pay As You Go model meaning you only pay for what you use.
    Starting Price: $15 for 500 PDFs
  • 6
    Anvil

    Anvil

    Anvil

    Anvil provides companies who require a high volume of PDFs to be filled, generated, maintained, and/or signed a customizable, embedded, logic-based workflow platform.
    Starting Price: $0 per month
  • 7
    PDFMonkey

    PDFMonkey

    PDFMonkey

    PDFMonkey is the solution to handle your PDF generation needs. Web technologies, a simple REST API, it's never been so easy to make beautiful documents. Stop wasting time! Save development time, no more PDF building code to write, no more configuration, no dependency hell. We handle all the complexity for you.
    Starting Price: €15 per month
  • 8
    OneSimpleApi

    OneSimpleApi

    OneSimpleApi

    A toolbox with all the things you need to get your project to success: Image resize and CDN, PDF and Screenshots generation, Currency Exchange and Discounts, Email Validation, QR codes, and much more! Our color generator allows you to create a unique color based on a text, transform colors between HEX, RGB and HSL, and obtain Color palettes based on an initial color, or text! Image manipulation doesn't have to be hard. This API makes it super simple to adapt your images and then deliver them using a Content Delivery Network. Calculate readability scores, reading time estimates and sentiment scores with ease for all your texts. Generate perfect QR codes images or vectors. 100% customizable and effortless. Use it to promote an event, give a discount, or share a link. Obtain a Spotify Profile details, including their name, followers, popularity, picture, monthly listeners, biography, social media links, top songs, and top listeners locations.
    Starting Price: $19 per month
  • 9
    WebPDF

    WebPDF

    SC Dailydriven United SRL

    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 Rescale PDF There are many other tools not mentioned here and lots more to be released. You can try WebPDF for free, even without an account.
    Starting Price: $4/month
  • 10
    Mindee

    Mindee

    Mindee

    Mindee is the first fully horizontal and developer centric document understanding platform. We help developers and product teams worldwide build the most intuitive and efficient user experiences when it comes to document processing. You will be able to : - Build magical UX using our 1-second-response-time synchronous API - Differenciate your product leveraging the latest computer vision deep learning models - Scale everywhere. We are fully language agnostic and do not depend on templates - Save your users time and hassle by freeing them from manual data entry - Easily integrate in no time within your roadmap thanks to our client libraries in all main languages and our clean documentation -Sleep tight knowing everything happens on a scalable and secure infrastructure, fully GDPR compliant -Extend the fun leveraging everything from our open-source software toolbox -Trust the bill. No setup fee, no platform fee, no maintenance fee.
  • 11
    aPDF.io

    aPDF.io

    aPDF.io

    A 100% free REST API to create, edit, split, merge, search, and manage PDFs programmatically. Features include rotating and deleting pages, password protection, compressing files, and background async execution. With no fees and just an API token required, it’s the perfect tool for developers needing powerful, seamless PDF handling.
    Starting Price: 100% Free
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