Convert the editor's HTML to a Microsoft Word .docx file server-side and stream it back as a download. Built on MIT-licensed DocumentFormat.OpenXml — no external service, no cloud API, no DOCX SaaS subscription to wire up.

Server wiring

The endpoint is mapped automatically by MapRichTextBoxUploads().

using RichTextBox;

builder.Services.AddRichTextBox();

var app = builder.Build();
app.MapRichTextBoxUploads();   // also maps POST /richtextbox/export/docx

Client-side helper

editor.aiToolkit.exportDocx({
    // all fields optional
    url:      "/richtextbox/export/docx",
    fileName: "quarterly-update.docx",
    title:    "Quarterly update",
    onError:  function (err) { console.error(err); }
});

Or drive it yourself

The endpoint is a plain POST; feel free to call it from any stack (Blazor, JavaScript, even curl).

curl -X POST "https://your-site/richtextbox/export/docx" \
    -H "Content-Type: application/json" \
    -d '{ "html": "<p>Hello</p>", "title": "Memo" }' \
    -o memo.docx