VB.NET PDF library for document processing

GdPicture’s VB.NET SDK empowers your applications with professional PDF editing, AI-driven OCR, intelligent data extraction, and seamless conversion of 100+ file formats. No external dependencies. Battle-tested since 2003.

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View, generate, and convert 100+ document formats

PDF viewer

Embed a powerful PDF viewer in your VB.NET applications with support for WinForms, WPF, and ASP.NET. Display complex documents with crystal clear rendering, enable interactive form filling, add annotations and digital signatures, and navigate multipage files with thumbnails. Supports all PDF versionsm including PDF/A and 100+ document, Office, and image formats.

PDF generation

Create ISO-compliant PDFs programmatically with the VB.NET PDF SDK. Generate structured, accessible PDFs with full PDF/UA tagging for screen readers, ensure long-term archiving with PDF/A-1 through PDF/A-4 support, and optimize for web delivery with linearization. Build PDFs from scratch, convert images to searchable documents, or fill templates with dynamic content.

PDF conversion

Convert 100+ file formats to PDF with enterprise-grade quality — no external dependencies required. Transform Office documents (Word, Excel, PowerPoint); CAD files (DXF); email formats (EML, MSG); 50+ image types, including RAW camera formats; and web content (HTML, MHTML) to PDF or PDF/A. Advanced compression with MRC technology reduces file sizes up to 90 percent while preserving quality.

Scan and print image, PDF, and Office documents

Scanning

Capture documents from TWAIN- and WIA-compatible scanners and digital cameras with enterprise-grade acquisition features. Build production-ready scanning applications with duplex scanning, automatic blank page detection, deskew correction, and noise removal filters. Process high-volume batches and save directly to multipage PDF, searchable PDF with OCR, PDF/A, or TIFF formats.

TWAIN SCANNING WIA SCANNING

Printing

Print any document to any Windows printer with complete programmatic control. Configure duplex mode, select paper trays, set print quality, control alignment, and manage multipage documents with page range selection. Print silently in the background or display printer dialog boxes. Supports 100+ file formats, including PDF, Office documents, images, and multipage TIFF files.

Compress and optimize PDFs

Hyper-compression

Reduce PDF file sizes by up to 90 percent without quality loss using advanced MRC (mixed raster content) image segmentation technology. The VB.NET SDK intelligently separates text, graphics, and images, compressing each layer with the optimal algorithm — JBIG2 for bitonal content, and JPEG2000 for color images. Perfect for scanned documents, image-heavy PDFs, and archival workflows. Includes automatic background downscaling and configurable quality-to-compression tradeoffs.

Optimization

Enterprise-grade PDF optimization engine with more than 10 years of continuous algorithm refinement. Automatically pack fonts, compress data streams, analyze and downscale images, remove duplicate objects, and strip unnecessary metadata. Smart color detection converts color scans to grayscale or bitonal when appropriate. Use multithreaded processing for high-volume workflows, and take advantage of comprehensive control over annotations, bookmarks, form fields, JavaScript, thumbnails, and embedded file removal.

Annotate and edit image, PDF, and Office documents

Annotation and collaboration

Add comprehensive annotation capabilities to your VB.NET applications with 12+ annotation types, including text markup (highlight, underline, strikethrough), sticky notes, rubber stamps, freehand drawings, shapes, and file attachments. Create custom annotations, assign PDF actions, and flatten annotations permanently. Import/export annotations in XFDF format for seamless data exchange. Supports PDF, Office documents, and image files with real-time viewer integration.

Form filling

Complete form lifecycle management with the VB.NET PDF SDK. Create fillable forms with text fields, checkboxes, radio buttons, dropdowns, and signature fields. Programmatically fill forms from databases or XFDF imports, extract form data to any output format, and flatten forms to prevent editing. Configure fonts (Standard, TrueType, OpenType), colors (RGB/CMYK), and field properties. All modifications display in the viewer in real time for instant collaborative form filling workflows.

Editing

Comprehensive PDF editing with complete page manipulation control. Merge 100+ file formats into single PDFs, split documents by page ranges or odd/even pages, rotate pages at any angle, and reorder page sequences. Clone, duplicate, append, and delete pages programmatically. Add text, images, and watermarks with precise positioning. Modify document metadata, page labels, and embedded content. Apply 50+ image filters, including blur, sharpen, color adjustment, and cropping.

VB.NET OCR and AI data extraction

OCR

Extract text from images and PDFs with AI-powered OCR supporting 130+ languages. Convert scanned documents to searchable PDFs with greater than 99 percent accuracy using 15+ years of ML refinements. Built-in preprocessing includes automatic deskew, noise removal, and character enhancement. Choose FavorAccuracy or FavorSpeed modes, process multipage TIFFs, and create PDF/A-4f archives with built-in multithreading for high-volume workflows.

OMR

Apply optical mark recognition (OMR) for automated form processing — scan multiple choice exams, questionnaires, and surveys. Detect filled bubbles, checkboxes, and oval marks with confidence scoring. Anchoring technology compensates for document translation and stretching. Returns binary results with configurable sensitivity. Ideal for exam grading, survey processing, and high-volume data capture.

Barcode reading and writing

Read and generate 50+ barcode types, including QR code, PDF417, Data Matrix, Aztec Code, and 2D+ 1D linear barcodes. Our AI-powered engine with fuzzy logic and error correction reads damaged barcodes from 90+ image formats and PDFs. Extract type, value, confidence score, rotation, and checksum. Generate barcodes to 100+ output formats as vector or raster images with multi-barcode detection.

MICR

Use magnetic ink character recognition (MICR) for automated bank check processing. Extract MICR codes from check bottom lines using E-13B and CMC-7 font recognition. Automatic detection without manual region specification — retrieve routing numbers, account numbers, and check numbers instantly. Integrates with the OCR engine for security validation. Essential for banking workflows and payment processing automation.

Automatic document recognition

Automatically classify and categorize documents using ML-based image template matching. Identify document types — invoices, checks, forms, receipts, and purchase orders — with confidence scoring. Create templates from samples, assign tags, and match new documents against your library. Extract structured data from recognized types. Ideal for mailroom automation, invoice processing, and intelligent document routing.

Tagged PDFs

Create accessible PDF/UA documents with logical structure for screen readers and assistive technologies. Add semantic tags (Sect, Figure, Span, Paragraph, Heading) to define document hierarchy. Specify alternative text for images, and set document language for correct pronunciation. Meet WCAG and Section 508 compliance requirements while ensuring proper content ordering and navigation.

Security and compliance

Encryption

Secure documents with 128-bit or 256-bit AES encryption using separate user and owner passwords. Configure granular permissions for printing, copying, modifications, annotations, form filling, and assembly. Remove password security when needed. ISO 32000-2 compliant encryption for safe digital signing workflows.

Digital signatures

Add digital signatures using PKCS#12 certificates to ensure document authenticity and integrity. Apply certified signatures, timestamps, and multiple signatures per document. Validate certificate validity and document modifications. Full PDF/A compliance for long-term validation with configurable hash algorithms.

Redaction

Permanently remove sensitive data with AI-powered smart redaction. Automatically detect credit cards, SSNs, IBANs, emails, phone numbers, addresses, and more. Search and redact using text or regex patterns, or define areas by coordinates. Build GDPR- and CCPA-compliant applications with irreversible removal in less than one second.

PDF/A support

Convert 100+ file formats to ISO-compliant PDF/A for long-term archiving with support for all versions (PDF/A-1 through PDF/A-4) and conformance levels. Validate with detailed reports — passes veraPDF and Adobe Preflight validators. Create searchable PDF/A with OCR, and combine with hyper-compression for optimized file sizes.

Trusted by 3,000+ customers and Fortune 500 companies

15Y+

More than 15 years of experience developing our SDK

10K+

Trusted by more than 10,000 developers

Frequently asked questions

What features does the GdPicture.NET PDF SDK offer for PDF creation and editing?

The SDK enables developers to create structured, secure, and compliant PDF files, supporting all versions up to PDF 2.0. It offers features such as adding layers, transparency, images, and other content. Additionally, it provides capabilities for splitting, merging, swapping, deleting, appending, cloning, duplicating, and rotating pages within PDF documents.

Can the GdPicture.NET PDF SDK handle PDF annotations and collaboration features?

Yes. The SDK includes robust annotation tools, enabling users to add, edit, and manage annotations such as highlights, sticky notes, freehand drawings, and more. These features facilitate collaboration and document review processes.

Does the SDK support PDF viewing and printing functionalities?

Absolutely. The GdPicture.NET PDF SDK provides a powerful PDF viewer engine with advanced features suitable for .NET, WPF, and web applications. It enables viewing, printing, and annotating PDF documents, as well as text searching, extraction, region highlighting, and navigation through PDF bookmarks.

What optimization capabilities does the GdPicture.NET PDF SDK offer?

The SDK includes a comprehensive PDF optimization engine designed to reduce file sizes through various techniques, such as removing unnecessary elements, recompressing images, and optimizing fonts. This results in faster-loading PDFs that maintain high quality.

Is the GdPicture.NET PDF SDK compatible with multithreaded applications and various development environments?

Yes. The SDK is designed to be thread-safe, enabling integration into multithreaded applications. It offers cross-platform support for Windows (32-bit, 64-bit, and AnyCPU), Linux x86-64, Linux ARM-64, and macOS Universal (Intel and M series CPU-based). It’s compatible with .NET Framework 4.5 and higher, .NET Core 3.1, and .NET 5.0 or higher, supporting development environments such as WinForms, WPF, ASP.NET, and COM/ActiveX.

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