You might be able to export InDesign INDD documents to HTML using the export or save as.. function in InDesign.
Convert Adobe InDesign document to HyperText Markup Language web page.
We found 4 software records in the database related to .indd to .html file format conversion.
Microsoft Windows software - convert indd to html on Windows
A design software used to create rich documents for web or print
Convert from indd file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned indd to html. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Professional desktop document publishing software from Adobe
Apple macOS / Mac OS X software - convert indd to html on OS X
Software fro document design and publishing
Mac version od Adobe's popular document designing and publishing software