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Changes

Updated on Jun 16, 2026

The following sections summarize the new features introduced in the library. Each section includes links to the relevant documentation articles.

What Is New in 2024 Q4

Introduced timeout mechanism for import and export of documents. The new Import and Export methods for all format providers have a mandatory timeout parameter. For more information, see Formats and Conversion.

What Is New

Mail Merge support that you can use to generate documents from a template document (containing merge fields) and a data source. For more information, see Mail Merge.
Document Variables that let you define variables in the document and use document variable fields. For more information, see Document Variables.
Export of table styles to HTML.
Import/export HTML preserving white spaces through non-breaking spaces.
Import and export document theme to DOCX file format.
Introduced lists export/import to HTML.

What Is Fixed

Table border calculator does not work correctly for tables with empty rows.
Style element is not correctly imported when it is outside the head element.
Incorrect export of nested table elements.
Converted Border class to immutable type.
Importing empty string causes exception.
Class attribute is exported when ExportSettings.StylesExportMode is None.
NullReferenceException is thrown when FieldResult is empty string or null.
Properties of paragraphs without StyleId are not exported when StylesExportMode is Inline.
Importing HTML containing only an image causes exception.
Line breaks are not exported to HTML.
Underline is not exported to HTML.
HtmlFormatProvider crashes when html element is present in the body.
Support for negative indent.
Table column widths are not respected when importing from HTML and exporting to DOCX.
Importing from HTML imports table borders as inside borders.
StyleProperty.GetActualValue() throws exception when style is not added to a document.
RestartAfterLevel property in ListLevel class has inappropriate default value.
RestartAfterLevel does not work correctly when exported to RTF format.
Style applied to div is applied over paragraphs after the div.
Exporting to HTML document containing hyperlink with StylesExportMode Inline causes exception.
When importing from HTML, paragraph style is not respected.
Default font size is not exported correctly to RTF.