The Best PDF SDKs in 2026
We researched PDF SDKs from official websites, including pricing pages, plan tables and product documentation. Rankings reflect each product’s performance on the category’s core job, value for money and verified features, helping developers and buyers compare PDF SDKs.
Our top picks
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Top ranked
Foxit PDF SDK#1 of 319.3/10A broad commercial PDF SDK for teams building document-heavy applications across major platforms.
Pricing on request · 30-day trial
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Runner-up
Nutrient SDK#2 of 318.9/10A broad cross-platform PDF SDK with a useful free viewer tier and quote-based commercial licensing.
Free plan · 30-day trial
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Top-ranked free plan
Apache PDFBox#6 of 318.5/10A broad, free PDF toolkit for Java teams that need core document operations without paid plans.
Free plan
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
The full ranking 31 tools, best first
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Best forMature teams needing broad PDF capabilities
A broad commercial PDF SDK for teams building document-heavy applications across major platforms.
- Annotation tools
- Commercial license
Pricing on request · 30-day trial Our Foxit PDF SDK verdict → Visit FoxitFor vendors Sponsor this spot · #1 · $149/mo →9.3/10★★★★★Visit Foxit -
Best forTeams needing a complete cross-platform PDF SDK
A broad cross-platform PDF SDK with a useful free viewer tier and quote-based commercial licensing.
- Annotation tools
- Commercial license
Free plan · 30-day trial Our Nutrient SDK verdict → Visit NutrientFor vendors Sponsor this spot · #2 · $99/mo →8.9/10★★★★☆Visit Nutrient -
Best forEnterprise-grade native PDF processing
A native PDF SDK for enterprise applications that need broad document processing capabilities.
- Commercial license
8.8/10★★★★☆Visit Adobe -
Best forBroad enterprise PDF deployment coverage
A broad PDF SDK suite for enterprise teams building document features across many environments.
- Annotation tools
- Commercial license
8.7/10★★★★☆Visit Apryse -
Best forEnterprise apps needing specialized PDF controls
A broad PDF SDK for enterprise applications that need specialized document controls.
- Annotation tools
- Commercial license
Pricing on request · 60-day trial Our LEADTOOLS PDF SDK verdict → Visit LEADTOOLSFor vendors Sponsor this spot · #5 · $59/mo →8.6/10★★★★☆Visit LEADTOOLS -
Best forJava teams seeking a free general PDF SDK
A broad, free PDF toolkit for Java teams that need core document operations without paid plans.
- Annotation tools
- Commercial license
8.5/10★★★★☆Visit Apache PDFBox -
Best forSelf-hosted Java or .NET PDF generation
A capable self-hosted PDF library with flexible licensing and standards support.
8.4/10★★★★☆Visit iText Core -
Best forBudget-conscious .NET teams
A broad PDF toolkit for .NET teams, with a free eligibility-based license and paid automation features.
- Annotation tools
- Commercial license
8.3/10★★★★☆Visit Syncfusion -
Best forFeature-rich commercial PDF development
A feature-rich commercial PDF SDK with extensive document and standards support.
- Annotation tools
- Commercial license
8.2/10★★★★☆Visit Aspose.PDF -
Best forFree rendering and document-conversion pipelines
A mature choice for rendering, conversion, compression, and OCR pipelines.
- Commercial license
8.1/10★★★★☆Visit Ghostscript -
Best forFree native PDF rendering and parsing
A free foundation for native PDF rendering, parsing, extraction, annotations, and editing.
- Annotation tools
- Commercial license
8.0/10★★★★☆Visit PDFium -
Best forWindows users needing an affordable PDF editor
A feature-rich Windows PDF editor with perpetual licenses, but not a cross-platform SDK.
- Annotation tools
- Commercial license
7.9/10★★★★☆Visit PDF-XChange -
Best forFree Python HTML-to-PDF generation
A free Python-first HTML-to-PDF engine for developers building document workflows.
7.8/10★★★★☆Visit WeasyPrint -
Best forJavaScript PDF work in web and API apps
A focused open-source choice for PDF creation and page operations in JavaScript.
7.7/10★★★★☆Visit pdf-lib -
Best forTemplate-based PDF document generation
A focused API for conditional, data-driven PDF and DOCX generation.
7.6/10★★★★☆Visit Adobe -
Best forCross-platform PDF apps with many bindings
A broad commercial PDF toolkit for cross-platform apps, with quote-based pricing.
- Annotation tools
- Commercial license
7.5/10★★★★☆Visit ComPDFKit -
Best forDocument-processing teams needing OCR and scanning
A wide-ranging SDK for OCR, scanning, PDF workflows, and document extraction.
- Annotation tools
- Commercial license
7.4/10★★★★☆Visit GdPicture.NET -
Best forLow-cost cross-platform PDF development
A broad, low-cost PDF toolkit with a capable free edition and focused paid licensing.
- Annotation tools
- Commercial license
7.3/10★★★★☆Visit Spire.PDF -
Best forDevelopers wanting a low-cost .NET PDF SDK
A feature-rich .NET PDF SDK with a free mode and $890 one-time entry price.
- Annotation tools
- Commercial license
7.2/10★★★★☆Visit GemBox.Pdf -
Best forCommercial .NET PDF and HTML conversion
A broad commercial PDF toolkit for .NET teams that need conversion and document controls.
- Annotation tools
- Commercial license
7.1/10★★★★☆Visit IronPDF -
Best forEnterprise PDF workflows needing broad processing depth
A broad commercial PDF SDK for teams that need Adobe-based processing across major operating systems.
- Annotation tools
- Commercial license
7.0/10★★★★☆Visit Datalogics -
Best forC# developers building generated PDFs
A capable C# PDF SDK with broad document operations and a free eligible-use tier.
- Annotation tools
- Commercial license
6.9/10★★★☆☆Visit QuestPDF -
Best forFree Java HTML-to-PDF generation
A focused JVM library for HTML-based PDF generation, accessibility, and PDF/A output.
- Commercial license
6.8/10★★★☆☆Visit OpenHTMLtoPDF -
Best forHigh-quality HTML-to-PDF generation
A focused HTML-to-PDF formatter with strong layout, accessibility, and server options.
6.7/10★★★☆☆Visit Prince -
Best forFree .NET PDF creation and manipulation
A free .NET PDF library for creation, editing, forms, signatures, and core document operations.
- Annotation tools
- Commercial license
6.6/10★★★☆☆Visit PDFsharp -
Best forFree Java PDF creation and editing
A capable free Java PDF library for creation, editing, rendering, and extraction.
- Annotation tools
6.5/10★★★☆☆Visit OpenPDF -
Best forFree native PDF rendering and inspection
A strong free choice for native PDF rendering, inspection, annotations, and forms.
- Annotation tools
6.4/10★★★☆☆Visit Poppler -
Best forNative C++ PDF parsing and signing
A focused native C++ PDF library with broad document operations but no rendering.
- Annotation tools
- Commercial license
6.3/10★★★☆☆Visit PoDoFo -
Best forBasic free native PDF generation
A free native PDF generator for applications that do not need PDF editing or extraction.
- Annotation tools
- Commercial license
6.2/10★★★☆☆Visit libHaru -
Best forAutomated PDF preflight and production workflows
A specialized SDK for automating PDF preflight, correction, conversion, and print production.
- Commercial license
6.1/10★★★☆☆Visit site -
Best forFree cross-platform PDF rendering and manipulation
A broad, cross-platform PDF engine for developers who do not need OCR.
- Annotation tools
5.5/10★★★☆☆Visit MuPDF
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | PDF operations | Supported platforms | Language coverage | Deployment model | Score |
|---|---|---|---|---|---|---|---|---|
| 1 | Foxit PDF SDK | No | Rendering, creation, editing, annotation, forms, signatures, search, OCR, extraction, conversion, security, compression, and document comparison | Windows, macOS, Linux, Web, Android, and iOS | C, C++, C#, .NET, .NET Core, Java, JavaScript, Node.js, Python, Objective-C, and Go | Hybrid | 9.3 | |
| 2 | Nutrient SDK | Yes | Viewing, rendering, editing, annotation, forms, signing, generation, conversion, OCR, extraction, redaction, comparison, collaboration, and AI processing | Web, iOS, Android, Windows, macOS, Linux, Flutter, React Native, MAUI, .NET, Java, Python, Node.js, and self-hosted/server environments | JavaScript, .NET, Java, Python, Node.js, Dart/Flutter, React Native, and MAUI/.NET | Hybrid | 8.9 | |
| 3 | Adobe PDF Library SDK | No | Creation, editing, assembly, rendering, printing, font embedding, forms, layers, compression, optimization, content extraction, search, indexing, and PDF/A/PDF/X conversion. | Microsoft Windows 64-bit, macOS 64-bit, Linux 64-bit; desktop and server environments. | C and C++ APIs and samples. | Hybrid | 8.8 | |
| 4 | Apryse SDK | No | Viewing, rendering, creation, generation, editing, annotation, form handling, page manipulation, extraction, conversion, redaction, encryption, signing, and PDF/A validation. | Web, Windows, macOS, Linux, iOS, Android, server, desktop, and client-side environments. | C++, Node.js, Python, Go, Ruby, PHP, Java, Swift, .NET Core, JavaScript, TypeScript, C#, VB, Objective-C, and C interface bindings. | Hybrid | 8.7 | |
| 5 | LEADTOOLS PDF SDK | No | Viewing, rendering, reading, writing, generation, conversion, PDF/A conversion, linearization, compression, merging, splitting, page manipulation, extraction, forms, annotations, redaction, encryption, signatures, search, comparison, bookmarks, portfolios, attachments, and PDF JavaScript | Windows, Linux, macOS, Android, iOS, Web; .NET 6+, .NET Framework, .NET MAUI, Xamarin, UWP, WinForms, C++ Class Library, ASP.NET, Web Services, and Web API | C#, VB, XAML, C/C++, Java, Objective-C, Swift, HTML, and JavaScript | Hybrid | 8.6 | |
| 6 | Apache PDFBox | Yes | Free | Creation, manipulation, text extraction, image extraction, rendering, merging, splitting, form filling, PDF/A validation, printing, encryption, decryption, and digital signing. | Java runtime; PDFBox 3.0.x requires Java 8 or later. | Java | 8.5 | |
| 7 | iText Core | Yes | 8.4 | |||||
| 8 | Syncfusion PDF Library | Yes | $1,199/user/yr | Creation, reading, editing, rendering, forms, annotations, conversion, OCR, extraction, compression, merging, splitting, redaction, encryption, digital signatures, and PDF standards compliance | Windows Forms, WPF, ASP.NET Web Forms, ASP.NET MVC, ASP.NET Core, Blazor, UWP, WinUI, .NET MAUI, Flutter, Unity, Linux, macOS, Azure, AWS, and GCP | C# | Server-side | 8.3 |
| 9 | Aspose.PDF | No | $1,679 one-time | Creation, editing, rendering, conversion, compression, extraction, forms, annotations, pages, attachments, metadata, security, and digital signatures | Windows, macOS, Linux, Android, .NET, Java, C++, Python, JavaScript, Node.js, PHP, Go, Rust, SharePoint, Reporting Services, and JasperReports | .NET languages including C# and VB.NET; Java; C++; Python; JavaScript; Node.js; PHP; Go; Rust; plus interoperability options including ASP, Delphi, Perl, PowerBuilder, VBScript, and Visual Basic | Hybrid | 8.2 |
| 10 | Ghostscript | Yes | Free | Rendering, generation through conversion, compression, optimization, rasterization, vector output, OCR, PDF/A conversion, and extraction of searchable text | Windows, macOS, Linux and other Unix-like systems, VMS, embedded systems, host-based, SaaS, and cloud environments | C; Python, C#, and Java bindings for gsapi | Hybrid | 8.1 |
| 11 | PDFium | Yes | Free | Rendering, parsing, document loading, text extraction, annotation, editing, form support, and PDF object access | Windows, Linux, Mac, and Android builds | C-compatible public API and C++ source code | Client-side | 8.0 |
| 12 | PDF-XChange Editor | Yes | $62/user one-time | Viewing, rendering, creation, editing, annotation, conversion, OCR, redaction, digital signing, form creation and extraction/page manipulation | Windows 10 and later; Microsoft/Citrix Terminal Server compatibility documented for earlier versions | C#, C/C++, Delphi, Visual Basic and Visual Basic .NET for the documented SDK examples | Client-side | 7.9 |
| 13 | WeasyPrint | Yes | Free | 7.8 | ||||
| 14 | pdf-lib | Yes | Free | 7.7 | ||||
| 15 | Adobe Document Generation API | Yes | 7.6 | |||||
| 16 | ComPDFKit PDF SDK | No | Viewing, rendering, annotation, editing, forms, signatures, security, watermarking, conversion, generation, text/table/image extraction | Web, Windows, Mac, Android, iOS, Flutter, React Native, Java, .NET, Linux/self-hosted environments | JavaScript, Java, C++, C#, .NET, Python, PHP, Ruby, Go, Node.js, Kotlin, Swift | Hybrid | 7.5 | |
| 17 | GdPicture.NET | No | PDF creation, rendering, viewing, editing, merging, splitting, conversion, PDF/A conversion and validation, optimization, encryption, digital signatures, annotation, redaction, text extraction, image extraction, and form-field processing | Windows, Linux x86-64, Linux ARM-64, macOS Universal, .NET Framework, .NET Core, .NET 5+, ASP.NET, WinForms, WPF, COM/ActiveX, and web applications | C#, VB.NET, Visual Basic 6, Delphi, C++, Microsoft Access, Visual FoxPro, HTML, JavaScript, VBScript, ASP.NET, and PHP | Hybrid | 7.4 | |
| 18 | Spire.PDF | Yes | $999 one-time | Creation, reading, editing, rendering/conversion, merging, splitting, form processing, annotation, compression, security, digital signatures, printing, and content extraction. | .NET Framework, .NET Core, Microsoft Azure, Xamarin, Java SE, Jakarta EE, Windows, Linux, Unix, macOS, Android, desktop, server-side, and web applications. | C#, VB.NET, Java, Python, C++, and JavaScript; Android via Java. | Hybrid | 7.3 |
| 19 | GemBox.Pdf | Yes | $890/user one-time | Reading, writing, editing, updating, generation, HTML conversion, PDF-to-image/XPS conversion, rendering, printing, merging, splitting, forms, OCR extraction, redaction, encryption, and digital signatures. | .NET 6.0–.NET 10, .NET Standard 2.0+, .NET Framework 4.6.2+, Windows, Linux, macOS, Android, iOS, ASP.NET Core, Azure, Docker, WPF, MAUI, and Xamarin. | C# and VB.NET | Hybrid | 7.2 |
| 20 | IronPDF | No | $999 one-time | Creation, rendering, HTML and document conversion, editing, extraction, annotation, forms, organization, signing, security, and standards compliance | Windows, Linux, macOS, Docker, Azure, AWS, and remote container deployments | C#, F#, VB.NET, .NET, Java, Node.js, and Python | Hybrid | 7.1 |
| 21 | Datalogics Adobe PDF Library | No | $5,999/yr | Creation, editing, annotation, splitting, merging, flattening, rendering, conversion, OCR, text extraction, search, digital signatures, security, forms, image processing, optimization, compression, PDF/A and PDF/X validation | Windows, Linux, macOS; Adobe C/C++, Modern C++, .NET, .NET Framework, Java; NuGet, Maven, direct C++ download, and container deployment | Adobe C/C++, Modern C++, .NET, .NET Framework, Java | Hybrid | 7.0 |
| 22 | QuestPDF | Yes | $1,999 one-time | PDF generation, layout, rendering to PDF/SVG/images, merging, page selection, overlays, underlays, attachments, encryption, decryption, linearization, metadata, and accessibility tagging | Windows, macOS, Linux; deployable in server-side, cloud, SaaS, on-premises, and desktop applications | C# on .NET | Hybrid | 6.9 |
| 23 | OpenHTMLtoPDF | Yes | Free | HTML/XHTML rendering, PDF generation, image output, PDF/A generation, accessible PDF generation, form controls, file embedding, and Java2D rendering | JVM; tested with OpenJDK 8, 11 and 17; compatible with Google App Engine Java environments | Java and other JVM languages | Server-side | 6.8 |
| 24 | Prince | No | 6.7 | |||||
| 25 | PDFsharp | Yes | Free | Creation, processing, modification, merging, splitting, drawing, rendering, annotations, encryption, forms, and digital signatures | Windows, Linux, macOS, and other platforms supported by .NET; Windows-specific GDI and WPF builds | C# and other .NET languages | 6.6 | |
| 26 | OpenPDF | Yes | Free | PDF creation, editing, rendering, HTML-to-PDF generation, text extraction, encryption, and compression | Java/JVM, Android; Linux, macOS, and Windows native binaries are documented for Brotli support | Java and Kotlin | 6.5 | |
| 27 | Poppler | Free | Rendering, document loading, annotation and form handling, metadata and structure inspection, font and attachment inspection, PostScript output, and PDF modification through supported APIs. | Debian, Ubuntu, Fedora, Android; community CI also covers FreeBSD, macOS, and Windows. | C++; C through the GLib interface; Qt5 and Qt6 C++ interfaces. | Client-side | 6.4 | |
| 28 | PoDoFo | Yes | Free | Parsing, creation, writing, modification, annotation, form fields, signing, text drawing, extraction, and PDF/A/PDF/UA preservation; rendering is not supported. | Windows, macOS, Linux; Android and iOS cross-compilation is known to work but may not be supported. | C++17 | Client-side | 6.3 |
| 29 | libHaru | Yes | Free | Generation; drawing lines, text, and images; outlines; annotations; compression; image and font embedding; encryption | Windows, Linux, FreeBSD, NetBSD, Solaris, and other ANSI-C platforms | ANSI C; C++; Ruby, Delphi/Free Pascal, and C# bindings | Client-side | 6.2 |
| 30 | callas pdfToolbox SDK | No | Preflight, correction, analysis, manipulation, rendering, visualization, generation and decoration, conversion, reporting, color management, and imposition | Windows, macOS, Linux; native libraries and wrappers for application integration | C, C++, C#, .NET, Java | Server-side | 6.1 | |
| 31 | MuPDF | Yes | 5.5 |
Head-to-head All 28 comparisons →
- Foxit PDF SDK vs Nutrient SDK
- Foxit PDF SDK vs Adobe PDF Library SDK
- Foxit PDF SDK vs Apryse SDK
- Foxit PDF SDK vs LEADTOOLS PDF SDK
- Foxit PDF SDK vs Apache PDFBox
- Foxit PDF SDK vs iText Core
- Foxit PDF SDK vs Syncfusion PDF Library
- Nutrient SDK vs Adobe PDF Library SDK
- Nutrient SDK vs Apryse SDK
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How we rank PDF SDKs
Every tool on this page was researched by iTechGuides Editors from its official website — pricing pages, plan tables and product documentation. We rank on how well each one does this category's core job, what the free or entry plan includes, and where it falls short. Where we have enough verified facts, the score out of 10 is a rubric — job fit, value and how much we could verify — shown with its breakdown on every tool's page; a tool we have not verified enough to score yet shows its rank without a number. Scores are re-checked when a product changes its plans. Read the full editorial policy, or submit a tool we missed.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update