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Audio Translator turns any audio playing in a Firefox tab into live subtitles, translated in real time. Watch a Spanish live stream, join a call with German colleagues, follow a French lecture or a Japanese vlog, and read along in English, or in any of 39 languages.

Everything runs on your computer. Speech recognition runs locally, and translation uses on-device translation models, the same kind Firefox uses for its own page translation. No account, no cloud, no audio uploads. Nothing travels to a server and back, so it works on live streams and calls while they happen.

<b>How it works</b>
1. Click the Audio Translator icon on the tab that plays the sound. The sidebar opens with the subtitles.
2. Pick the language you hear (or leave it on Auto) and the language you want to read.
3. Subtitles appear word by word, about a second after the words are spoken.

On the first start the extension downloads its speech recognition model (about 440 MB) once, and a small translation model for each language pair you use. After that it starts right away and works offline.

<b>Features</b>
• Real-time audio translation: speech is transcribed and translated while it plays, not after the video ends.
• Any audio in the tab: videos, live streams, video calls, podcasts, online courses and webinars on any website.
• Video calls in the browser: Google Meet, Zoom and Microsoft Teams in a Firefox tab.
• Sidebar or overlay: read the subtitles in the sidebar next to the page, or turn on the overlay to show them on top of the video, also in full screen. Drag it, resize it and pick the text size.
• Autosave to a file: every session can be written to a text file in your Downloads folder, a ready transcript of the call, lecture or video.
• 33 spoken languages, 39 subtitle languages, and any pair between them.
• Auto-detect: leave the audio language on Auto and the extension works out what is being spoken.
• Live transcription: choose the same language on both sides to get a real-time transcript instead of a translation.
• Private by design: audio never leaves your device. No sign-up, no API key, no subscription, no tracking.

<b>Languages</b>
Speech is recognized in 33 languages: English, Spanish, French, German, Italian, Portuguese, Dutch, Polish, Czech, Slovak, Slovenian, Croatian, Bulgarian, Romanian, Hungarian, Greek, Lithuanian, Swedish, Danish, Finnish, Norwegian (Bokmål and Nynorsk), Russian, Ukrainian, Turkish, Arabic, Hebrew, Hindi, Chinese, Japanese, Korean, Thai and Vietnamese.

Subtitles can be shown in all of them, and also in Bengali, Indonesian, Kannada, Marathi, Tamil, Telugu and Traditional Chinese.

<b>Where it works</b>
• YouTube and other video sites, including videos without captions
• Movies and series in the browser
• Live streams and live events
• Video calls and meetings in the browser
• Podcasts, interviews and radio
• Online courses, lectures and webinars

<b>FAQ</b>
<i>Is my audio sent anywhere?</i>
No. Audio is processed on your computer and never leaves it. The extension has no servers of its own, no analytics and no ads.

<i>Why does it ask for access to websites?</i>
To hear the audio of the tab you click the icon on, and to show the overlay on top of the page. Page content is not collected or sent anywhere.

<i>What do I need?</i>
Firefox 142 or newer on desktop. No graphics card is needed.

<i>Can it translate the whole system audio or several tabs at once?</i>
It listens to one tab at a time. Click the icon on another tab to switch.

<b>Other versions</b>
• Chrome and other Chromium browsers, on the Chrome Web Store: https://chromewebstore.google.com/detail/audio-translator/phnegjcmilllfibjapkpolnfiifcjhcb
• Android phones, on Google Play: https://play.google.com/store/apps/details?id=app.audiotranslator

Website: https://audio-translator.mbplanes.com/