PDF SDK Evaluation Guide: What You Need To Achieve the Best Results

The right PDF SDK is a lifesaver for software development teams. For applications that require document capabilities, such as viewing PDF and Office files, filling forms or supporting digital signatures, choosing a stable, reliable SDK to handle these requirements is like hiring another developer. It allows your team to focus on building what differentiates your product, instead of spending cycles reinventing the wheel.

In addition to custom development, another common approach is to use open-source document libraries. For example, a developer may use a free library like PDF.js to quickly stand up a minimum viable product with PDF viewing. As the product grows and features are added, additional libraries are added to support features like PDF generation, form filling, OCR, and annotations. Before long, developers are managing dependencies, building custom integrations and fixing bugs.

Apryse offers SDKs that support the end-to-end document lifecycle, helping developers quickly integrate stable, reliable functionality and move on to other challenges.

In this article, we’ll overview 7 things developers should consider when evaluating PDF SDK vendors, giving you a PDF SDK evaluation checklist to help find the solution that meets your needs.

For regulated industries like financial services, healthcare, and government, information security and compliance is a major factor in PDF SDK procurement evaluations. For document processing, data residency is a key part of this. Data leaving a secure environment to be processed on third-party services can be a problem, as can security vulnerabilities caused by poorly supported or out-of-date code.

While open-source libraries are usually very well maintained by the community, ongoing support into the future is not guaranteed. Many organizations using open-source code fork the code or dedicate engineering effort to patching security vulnerabilities in-house. With proprietary SDKs like Apryse, security patches are rolled out regularly and in response to specific vulnerabilities.

As a self-hosted solution, Apryse stores and processes documents within your environment with no external dependencies, simplifying regulatory compliance. To demonstrate our dedication to security and compliance, Apryse has achieved the following certifications and attestations:

While bringing document processing capabilities into your platform has numerous benefits for adoption, infosec and version control, users don’t always love learning a new workflow. For example, when DOCX editing capability is available in your platform, if it’s not intuitive for users brought up on Microsoft Word, they will find a way to download documents and do their editing in a way that works. The same goes for rendering large files, conversion, comments, and other familiar, expected features.

Apryse is designed to handle large files such as financial contracts and datasets in the browser, server-side, or hybrid, using features like streaming, memory-sensible techniques, structural parsing, and infrastructure tuning for optimal performance.

For Office editing, the Apryse DOCX Editor and Spreadsheet Editor gives users a familiar Word-like and Excel-like experience, handling DOCX and XLSX formats without conversion to PDF, including features like tracked changes, advanced formatting for DOCX such as headers and footers, tables, columns and styles, and formulas, charts and navigating multiple sheets in a workbook in Spreadsheet Editor.

Scalability means two things for developers: can the SDK scale to meet changing product requirements? And can the SDK scale to serve a higher user volume?

This first point brings us back to the challenges in the intro of this article: ballooning tech stacks and dependency hell caused by a patchwork integration of multiple libraries. Apryse scales on features because it’s built with the full document lifecycle in mind, from intake and extraction to secure archiving.

For financial services, this could mean starting with built-in PDF viewing for a self-service customer portal, then growing into form filling and digital signatures to support an application workflow, then extending into Smart Data Extraction to support advanced analytics on unstructured organization documents. Apryse grows with your requirements without introducing compatibility issues.

On the technical side, one of the main ways WebViewer handles scalability is by offering a fully client-side solution that runs on JavaScript in the browser. This reduces server load and latency for users, while providing a secure document experience.

Not all apps are built in vanilla JavaScript. Apryse supports not only Web apps, but also offers the Server SDK and Mobile SDK, with a range of frameworks and languages including .NET, Python, Node.js, and Java, plus popular frameworks like React, Vue, Angular and Flutter. Find the full lists for each SDK in our documentation.

In addition to information security, other compliance requirements include accessibility and privacy, as well as industry-specific regulatory compliance that requires archiving and logging. For example, AML in the financial industry requires customer identification, risk monitoring, and reporting requirements.

Apryse supports regulatory compliance, including privacy requirements like GDPR, accessibility standards such as the European Accessibility act and ADA with a WCAG 2.2 Level AA compliant UI, and tools to make accessible documents, such as PDF/UA conversion and auto-tagging.

For more details, check out the article Navigating Data Archiving Compliance in Finance: The Essential Role of PDF/A.

Ease of integration is a critical consideration, especially since a large part of the ROI of moving to a new PDF SDK is saving developer hours. As of June 2026, G2 ranks Apryse #1 as Best PDF SDK and Easiest to Use PDF SDK.

Not all SDK vendors are created equal. In addition to robust documentation, sample code, and API reference, Apryse offers live technical support to get you up and running faster.

Document processing requires more than PDF support. Quality PDF SDKs support all the file types you may encounter, such as images, Office documents, and even CAD drawings. Apryse supports 100+ file types and helps you convert between them, eliminating workflow disruptions.

As you proceed with your evaluation process, use these criteria to achieve the best results and ROI on your SDK migration. Apryse offers a free trial so that you can test functionality and features in your environment. You can also check out our showcase to demo features in your browser with no signup. If you have any questions, please contact sales.

Q: What is the best PDF SDK for enterprise applications?

A: The best enterprise PDF SDK combines reliable performance, strong security, broad document capabilities, and flexible deployment. Look for a solution that supports the full document lifecycle and scales as your application grows.

Q: What features should organizations look for in a PDF SDK?

A: Key features include PDF viewing, Office document support, annotations, form filling, digital signatures, OCR, document conversion, security features, cross-platform compatibility, and comprehensive developer documentation.

Q: How do PDF SDKs support compliance requirements?

A: Enterprise PDF SDKs support compliance through self-hosted deployment, encryption, digital signatures, accessibility features, PDF/A archiving, and tools that help meet standards such as GDPR, HIPAA, and WCAG.

Q: What is the difference between a PDF SDK and a PDF API?

A: A PDF SDK is integrated directly into your application and gives you full control over document processing. A PDF API performs document processing through a hosted service, making it easier to get started but with less control over deployment and data handling. PDF APIs also may lead to high usage bills as processing volume increases.

Q: What deployment options matter when choosing a PDF SDK?

A: Choose a PDF SDK that supports the environments your application needs today and in the future. Look for client-side, server-side, mobile, cloud, and self-hosted deployment options, along with support for your preferred programming languages and frameworks. Flexible deployment makes it easier to meet performance, security, and compliance requirements.