Using the "File" menu, then "Import" action, HelpNDoc can import various existing documentation formats, including:

  • Compiled CHM help files as well as source HHP projects (*.chm);
  • WinHelp HLP files (*.hlp);
  • ePub eBooks (*.epub);
  • HTML web pages (*.htm; *.html). This format can be split into multiple topics based on heading level or font size;
  • Markdown files (*.md). This format can be split into multiple topics based on heading level;
  • Text files (*.txt);
  • Word documents including DocX and RTF file formats (*.docx; *.rtf). These formats can be split into multiple topics based on heading level or font size;
  • HelpNDoc project files (*.hnd). This format lets you selectively bring in topics, library items, and keywords from existing projects. See: HelpNDoc project importer 
  • Folders that can contain one or multiple of the previously mentioned formats. Each file will be imported into its own topics. See: Import folders

Additionally, for some sources (such as HelpNDoc projects, the CHM help format or HHP projects), it is possible to only import the table of contents into a new project:

  1. Create a new project
  2. In the new project wizard dialog, click the "import from existing project" link to import the table of contents of the specified file.