Live Stream Translation — Real-Time Subtitles for Any Stream

StreamTranslate converts your spoken audio into translated subtitles on screen, in real time, during a live broadcast — with 1.5–2.5 second latency and support for 50+ source languages.

What Is Live Stream Translation?

Live stream translation converts spoken audio into written subtitles in a different language, in real time, during a live broadcast. Unlike pre-recorded video subtitles — which can be manually reviewed and corrected before publishing — live streams happen in the moment. The translation system must process speech, convert it to text, translate it, and display it on screen within 1–3 seconds.

StreamTranslate does exactly this via a browser source overlay that loads inside OBS, Streamlabs, or any broadcasting software that supports browser sources. There's no separate application to run, no audio routing workarounds, and no post-processing step. The subtitles appear live, on your stream, as you speak.

This technology matters because language is the single biggest barrier to building a global audience. A streamer with 10,000 English-speaking viewers might have 500,000 potential viewers in Brazil or Japan who can't follow the content. Live translation removes that barrier without requiring the streamer to speak a second language.

How It Works

The process runs in four steps, each happening within a fraction of a second:

1. Audio capture: StreamTranslate captures your microphone or desktop audio through the browser source, which has access to the audio context in your broadcasting software.
2. Speech-to-text: The audio is sent to a speech recognition engine that transcribes what you said into text in your source language.
3. Translation: If you've selected a target language different from your source, the transcript is passed through a translation engine that converts it to the target language in real time.
4. Subtitle display: The translated text appears in the browser source overlay, positioned on your stream canvas however you've customized it — lower third, top bar, or anywhere else.

Total end-to-end delay: 1.5–2.5 seconds from when you finish a phrase to when the subtitle appears on screen. That's low enough that viewers can follow a natural conversation without the subtitle feeling like it belongs to a different moment.

Platforms Supported

StreamTranslate works on any live streaming platform where you use OBS Studio or Streamlabs as your broadcast software. The overlay is just a browser source — the destination platform is irrelevant to how it functions.

• Twitch
• YouTube Live
• Kick
• Facebook Gaming
• TikTok Live
• X (Twitter) Live
• Any RTMP destination

If you can add a browser source in your streaming software and go live, StreamTranslate will work with it.

Languages Supported

StreamTranslate supports 50+ languages for speech recognition (source language detection) and 100+ languages for translation output. The most commonly used language pairs include:

• English → Spanish, Portuguese, French, German, Japanese, Korean, Arabic
• Spanish → English
• Japanese → English
• Korean → English
• Portuguese → English, Spanish
• French → English, Spanish
• Arabic → English

In practice, any combination of the 50+ source languages and 100+ target languages is available. If you speak a language and want to subtitle in a different language, it's very likely supported.

Who Uses Live Stream Translation

The use cases span different types of streamers and different goals:

• English-speaking streamers reaching international audiences: Adding Spanish or Portuguese subtitles dramatically increases discoverability and watch time from Latin America, Brazil, and Spain — markets that are growing faster than English-language streaming.
• Japanese or Korean streamers building Western audiences: English subtitles allow clips to spread on social media and VOD platforms where English-speaking viewers will encounter them.
• Multilingual streamers: Switch languages mid-stream or run subtitles in a third language your audience uses while you speak in another.
• Accessibility: Viewers who are deaf or hard of hearing benefit from same-language captions. Setting source and target to the same language gives you real-time captions without translation.
• Educational and instructional content: Complex terminology, tutorials, and explainers are easier to follow when viewers can read the words in their native language even while they're also hearing them.

Setup Overview

Getting live stream translation running takes under 5 minutes:

1. Create a free account at streamtranslate.live.
2. Create a room, set your source and target languages.
3. Copy the room URL.
4. In OBS, add a Browser source, paste the URL, set dimensions to 1280×720.
5. Go live — subtitles appear automatically.

The full setup walkthrough with screenshots is available at /setup.

How StreamTranslate Compares to Alternatives

Manual human translators are the gold standard for accuracy but are cost-prohibitive for live streaming at scale. YouTube's built-in auto-translation only works on recorded VODs, not live broadcasts. OBS caption plugins provide captions in the source language only — no translation. StreamTranslate is the only option that combines real-time performance, multi-language translation, and a stream-native overlay in one tool.

Pricing

StreamTranslate offers a free tier that lets you start adding translated subtitles immediately — no credit card required. Paid plans unlock unlimited streaming hours, additional customization options, and priority support. Full pricing details are at /pricing.

Frequently Asked Questions