Document metadata

Setting metadata

doc.Metadata(new DocumentMetadata(
    Title: "Invoice INV-20260709-001",
    Author: "Northwind Studio Ltd",
    Subject: "Invoice for June 2026"));

All properties are optional; CreationDate and ModificationDate default to the render time when unset:

new DocumentMetadata(
    Title: "…",
    Author: "…",
    Subject: "…",
    CreationDate: DateTimeOffset.UtcNow,
    ModificationDate: DateTimeOffset.UtcNow);

Where it ends up

Format	Written as
PDF	XMP metadata packet and the classic Info dictionary (kept consistent - a PDF/A requirement)
DOCX	OOXML core document properties
XLSX	OOXML core document properties
HTML	Title becomes <title>; Author becomes <meta name="author">; Subject becomes <meta name="description">. CreationDate and ModificationDate are not written - HTML has no metadata slot for them.

Consistent XMP is part of what makes Papyra’s output pass veraPDF - see PDF/A output.