NoaLingua for Chrome
Add to Chrome — Free Add to Chrome

Answer

NoaLingua translates without sending your subtitles anywhere

On-device by default; the cloud is a checkbox you tick yourself

Yes. Subtitle text is translated on your device by default, using Chrome’s on-device model. Sentence text only leaves your machine if you switch translation to Cloud yourself, and a single word only leaves it if you keep the grammar lookup option on.

Short answer Nothing leaves by default. Everything that can leave is behind a setting you control, and the list is published.

The complete list of what can leave, and its condition

Sentence text goes to MyMemory only when you have selected Cloud translation. A single word — never the sentence — goes to Wiktionary, Wikidata or Tatoeba when the grammar lookup option is on. N-grams go to the Wiktionary API only for a language whose pack is not downloaded. A sentence opens in Google Translate only when you click that button. The sound of your voice goes to Chrome’s speech service only with online recognition enabled.

Never sent, under any setting: subtitle text without your explicit checkbox, your watch history, your cards, or your progress.

Why you can check this yourself

Open the network tab while you use it. The claims on the privacy page are written to survive exactly that, which is the only reason they are worth making.

The one exception is stated rather than hidden: a licence check contacts one endpoint once a day per device, storing a key, a status and a plan name — nothing that identifies a person.

More questions people ask NoaLingua

What is the default — on-device or cloud?

On-device. Cloud is opt-in and it is the only setting that sends sentence text off your machine.

Why does the grammar lookup send anything at all?

Because no offline pack covers every word. When it is on, a single word — never the sentence — can go to Wiktionary, Wikidata or Tatoeba. The three sit behind one setting you can turn off.

Is my watch history sent anywhere?

Never, under any setting. Nor are your cards or your progress.

Where this is documented on NoaLingua

The whole picture What is stored, what leaves the device and under which setting. The one server, and what it holds A key, a status and a plan name. No email, no name, no customer id. How the extension is built Permissions, the update path and what is deliberately not requested.

Try it on the next thing you were going to watch anyway.

Free, with every feature. No account, nothing to cancel, and your deck stays on your machine.

Add to Chrome — Free Add to Chrome Opens the Chrome Web Store listing NoaLingua — beyond dual subs: video, web, PDF — free, no account, Chrome 138 or newer.

What happens after you install Pricing What it cannot do