OfdSharp 

Core data models, XML serialization, and base primitives for OFD (GB/T 33190-2016).

Packaging and container access for OFD (ZIP container, virtual paths, resource extraction).

High-level OFD Reader API for loading documents, pages, layers, and resources.

Fluent OFD document and page content writer API for creating and modifying OFD documents.

Core rendering engine and canvas abstraction for OFD.

Digital signature and electronic seal verification and signing for OFD documents (GB/T 33190 Section 18 and GM/T SM2/SM3).

OfdSharp is a modern, high-performance .NET SDK for Open Fixed-layout Document (OFD, GB/T 33190), supporting document creation, parsing, rendering, text/image extraction, and conversion.

High-level document layout engine for OFD (Paragraphs, Tables, Auto-Paging, Headers, Footers).

High-performance bidirectional document format converters for OfdSharp, including PDF, SVG, Image (PNG/JPEG/WebP via SkiaSharp), and HTML conversion.