Documentation

Opt-in

The feature is intentionally opt-in — even on supported browsers the toolbar button is hidden unless you enable the plugin. Microphone permission is sensitive; we don’t want a mic icon appearing by default.

var cfg = {
    dictationEnabled: true,
    dictationLang: "en-US",              // BCP-47
    dictationContinuous: true,
    dictationInterimResults: true,
    dictationAutoPunctuation: true
};
new RichTextEditor("#editor", cfg);

In the ASP.NET Core Tag Helper:

<richtextbox asp-for="Body" toolbar="default"
             enable-dictation="true"
             dictation-lang="en-US"
             dictation-continuous="true"
             dictation-auto-punctuation="true" />

JavaScript API

editor.dictation.start();
editor.dictation.stop();
editor.dictation.toggle();
editor.dictation.isListening();     // boolean
editor.dictation.isSupported();     // false on Firefox

Browser support

• Chrome, Edge, Opera — supported (uses Google’s cloud speech service)
• Safari 14.1+ (macOS), iOS 14.5+ — supported (on-device or cloud depending on OS)
• Firefox — no SpeechRecognition; plugin detects this and hides the button.

First click prompts for microphone permission. Users can revoke it any time via browser site settings. The onerror handler shows a user-friendly message on not-allowed.