FluxSub

Two subtitles.
In the language you want.

Watch Netflix, Disney+, Coupang Play, TVING, and Wavve with two subtitle lines at once. If a language is missing, translate it.

Add to Chrome How it works

Chrome Extension · Current Version v1.0.0

The Chrome Web Store listing is being prepared.

If the subtitle you want is missing,
FluxSub fills it in.

If the language exists on the service, FluxSub uses that track. If it does not, the engine you chose writes the second line. Both sit on screen together.

Original

I thought you weren't coming.

Second subtitle

안 오는 줄 알았어.

If the language exists on the OTT, that subtitle is used. If not, the selected translation engine creates it. DRM is not bypassed. Only tracks already available in your logged-in session are fetched.

Built to stay out of the way.

The panel opens small over the player. Position and appearance can be set per subtitle.

You can choose how translation works.

Pick an engine in settings. Auto uses on-device Translator, then Google, then DeepL.

Chrome Translator

On-device

Fast local translation

Runs on your device. Subtitle text is not sent to a FluxSub server.

Google Cloud Translation

Cloud

Cloud translation with your Google API key

Uses your own API key from Options. The key stays on this device. Subtitle text is sent to Google.

DeepL

Cloud

Cloud translation with your DeepL API key

Free and Pro keys both work. Subtitle text is sent to DeepL.

Current version

v1.0.0 Released · 2026.09.05

Added

Dual subtitles on Netflix, Disney+, Coupang Play, TVING, and Wavve

Added

Chrome Translator, Google Cloud Translation, and DeepL

Added

Per-slot language, sync offset, and subtitle appearance

View all changes

FAQ

Is FluxSub free?

The extension is free. Chrome Translator has no extra cost. Google Cloud and DeepL need your own API keys.

Which services are supported?

Netflix, Disney+, Coupang Play, TVING, and Wavve. Only subtitle tracks already available in your logged-in session are used.

What if the language I want is missing?

If that language track exists, FluxSub uses it. If not, FluxSub translates into that language with the selected engine. You can also pick a translated language in the subtitle list.

Is translated text sent to a server?

Chrome Translator stays on your device. Google or DeepL send subtitle text to those APIs. Feedback you submit on this site is stored by FluxSub.

Does it work outside Chrome?

Official support is Chrome 116 or later. The built-in Translator usually needs a newer Chrome. Safari and Firefox are not supported.