Japanese Twitch streams with English subtitles, even in fullscreen

Published: 2026-09-16 ・ Updated: 2026-11-03

Works in Chrome or Edge on a computer (Firefox: through a microphone or audio input; the add-on covers YouTube and Twitch; not on phones). Japanese ⇄ English only.

Japanese Twitch has a lot going on: game streams, chatting streams, late-night talk, collabs. But while a stream is live there are no English subtitles.

Translation extensions cannot help either, because they translate captions that a video already has. A live stream has none.

This guide shows how to get live English subtitles on a Japanese Twitch stream, for free, in your browser, without installing anything. The streamer does not need to set anything up, so it works on any stream.

In short: add the free LiveSub extension for Chrome or Edge on your computer, press its icon on the Twitch stream's tab, and set “Translate from / to” to Japanese → English in the LiveSub tab that opens. The streamer's Japanese appears as English subtitles over the video, about one to two seconds behind, with no sharing dialog. Without the extension, open LiveSub in another tab and share the stream's tab instead. Chat and on-screen text are not translated.

Open LiveSub and try it

What you need

• Chrome or Microsoft Edge on a computer. In Firefox, LiveSub listens through a microphone or a loopback audio input (such as Windows Stereo Mix); on YouTube and Twitch, LiveSub for Firefox turns the video's audio into subtitles directly. Safari uses the same input method but is untested
• Not a phone or tablet. Mobile browsers cannot share tab audio
• Twitch open in the browser, not in a desktop app. The stream's sound has to be playing in a browser tab
• A one-time download of the speech recognition model. For Japanese, the Balanced setting is about 670MB; after the first time, it is loaded from your browser's storage

No account, no extension, no payment, and no time limit.

What gets subtitled

LiveSub is a website. You share one browser tab's audio with it. It recognises the Japanese speech on your own computer, translates it with Chrome's built-in on-device translator, and shows the Japanese and the English as subtitles. Your audio is never uploaded anywhere.

Because it works from sound, only sound is translated:

• Chat is not translated. It is text, not audio
• Text on screen is not translated either: game menus, overlays, on-screen captions
• Anyone you can hear is subtitled: the streamer, guests on a call, and characters speaking in the game

Think of it as a tool for following what the streamer is saying.

Step by step

1. Check it works before the stream starts

Open LiveSub in Chrome. Under "Translate from / to", choose Japanese → English. Japanese uses a different recognition model, and if you leave it on English → Japanese you get garbled text instead of subtitles.

Then press "Try the how-to video (no sharing)". It plays a short how-to video in Japanese and shows subtitles without sharing any tab, and it gets the one-time download out of the way. Do this before the stream you actually want to watch goes live.

2. Choose a recognition setting

Under "Recognition setting", Balanced is the recommended starting point for Japanese. It keeps up with live speech and handles names reasonably well.

If subtitles fall behind, choose Lighter. You can switch settings while the stream is running.

3. Open the stream and share its tab

Open the Twitch stream in another tab. Back in LiveSub, press "Start (share a tab)". In Chrome's sharing dialog:

1. Pick the "Chrome Tab" section at the top
2. Choose the tab playing the stream
3. Tick "Also share tab audio" at the bottom left
4. Press Share

4. Read the subtitles

When the streamer talks, the Japanese and the English appear about one to two seconds later. On the first run, they start once the model has finished loading.

Reading over a fullscreen stream

In the LiveSub tab you cannot see the stream. Press "Show in a floating window". The subtitles move into a small window that stays on top of everything else, so you can put the stream in fullscreen and still read them.

A layout that works:

1. Press "Show in a floating window" in LiveSub
2. Go back to Twitch and make the stream fullscreen
3. Drag the window somewhere it does not cover the action, such as the bottom edge

You can resize the window and scroll back to earlier lines. If you want it small, switch the display to "Translation only" so each line takes less space. If you want to keep chat visible, use Twitch's theater mode instead of fullscreen and put the window in the space next to it.

With the optional extension, the subtitles sit over the video instead.

Using Firefox? Firefox cannot share a tab's audio, so LiveSub listens through a microphone or an audio input instead. Open LiveSub in Firefox, play the video in another tab, and press "Start (mic or audio input)" on the LiveSub page. Allow microphone access when the browser asks. If your computer has a loopback input (such as Windows Stereo Mix), LiveSub picks it automatically; otherwise it listens through the microphone to the sound from your speakers (headphones will not work). There is no sharing dialog. On YouTube and Twitch, LiveSub for Firefox turns the video's audio into subtitles directly: press "Add to Firefox — it's free" to install it, play the video in another tab, and press "Start (YouTube / Twitch tab)"; the subtitles appear over the video. (More on YouTube and Twitch in Firefox: English subtitles for Japanese YouTube and Twitch streams in Firefox.)

Tips for Twitch

Add names to the word list

Speech recognition is bad at names, and Twitch streams are full of them: the streamer's nickname, regular viewers, game titles, characters, in-joke vocabulary.

Open "Word list" and add the correct spellings, one per line. Japanese entries need at least 3 characters, English ones 4. Anything recognition mishears is corrected to your spelling. To choose how a name appears in the translation too, write it as "たなか = Tanaka".

Collabs and game audio are harder

When two or more people talk at the same time, the overlapping parts come out wrong or get dropped. A stream with one person speaking at a time is the best case.

Loud music and sound effects also reduce accuracy. Chatting segments will be more accurate than boss fights.

If you are gaming on the same computer

Tick "Don't use the GPU (if games or video stutter)". Recognition gets a little slower, but it stops competing with your game for the GPU.

Long streams are fine

There is no time limit, because nothing runs on a server. "Download transcript" saves the whole session as a text file with timestamps, the Japanese and the English side by side, so you can go back and check something you missed.

Honest limits

• About one to two seconds of delay. This is not simultaneous interpretation
• It is machine translation. You get the gist; slang, jokes and wordplay often do not survive
• The Japanese can be misheard too, especially names. The word list helps, but it is not perfect
• Music, sound effects and overlapping voices reduce accuracy
• Chat and on-screen text are not translated. Only the audio is
• Computer only. It needs Chrome or Edge on a desktop or laptop (Firefox: through a microphone or audio input)

Wrapping up

Any Japanese Twitch stream you can play in your browser can get English subtitles, with nothing for the streamer to set up. Put the floating window at the bottom edge, or next to chat in theater mode, and follow along.

Open the Japanese stream you have been meaning to watch, then open LiveSub on your computer and press "Try the how-to video (no sharing)" first.

About this guide: written by the maker of LiveSub. Steps, button names and figures are checked against the LiveSub app as of the date above. If something is wrong, please tell us through the contact page.

Open LiveSub and try it