Nutrient .NET SDK guides — Add advanced PDF features to your .NET applications
Welcome to the Nutrient .NET SDK (formerly GdPicture.NET) developer guides. These guides show you how to add document functionality to .NET applications.
If you’re brand new to Nutrient, have a look at our get started guides to add document processing capabilities — including PDF editing, form filling, redaction, conversion, OCR, and extraction — to your application.
Guides
Browse the guides below by category, or jump to the additional standalone .NET guides at the end.
Best practices for PDF processing in .NET
Load a file
Learn how to open and load PDFs, images, and other document types using the available reader classes.
PDF document guides
Image guides
Document converter guides
Annotation manager guides
Save a file
Conversion
OCR
Extract text from scanned documents and images using optical character recognition, including preprocessing steps and common usage patterns.
OCR workflows and document types
OCR preprocessing guides
OCR usage guides
AI Document Processing
Document recognition
Editor
Modify document content and structure, including page manipulation, image editing, and text changes.
Editor guides
Page and image manipulation guides
Redaction
Extraction
Pull structured data from documents, including text, metadata, key-value pairs, MRZ data, and optical mark recognition (OMR) results.
Extraction guides
Key-value pair guides
Metadata extraction guides
MRZ extraction guides
OMR extraction guides
Text extraction guides
Barcodes
Generate, read, and scan 1D and 2D barcodes in your documents and images.
Barcode guides
Barcode generation guides
Barcode reading and scanning guides
PDF generation
Optimization
TWAIN and WIA scanning
Compare files
Annotations
Add, manage, and customize annotations on PDF documents, from basic markup to advanced annotation types.
Annotation guides
Introduction to annotations
Forms
Create, edit, fill, and remove interactive form fields in PDF documents.
Form guides
Create, edit, and remove form field guides
Fill form field guides
Signatures
Apply digital signatures, manage signature fields, and validate signed documents.
Signature guides
Digital signature guides
Signature field guides
PDF/A
PDF layers (OCGs)
Deployment
Troubleshooting
Diagnose and resolve common issues, including licensing problems and runtime errors.
Troubleshooting guides
Licensing troubleshooting guides
Code samples
Changelog
Downloads
About
Learn about supported platforms, file types, frameworks, and languages, along with migration and compatibility details.