TikTok's built-in caption support is limited and viewer-controlled. Here's how to add your own caption overlay to TikTok Live streams using OBS and StreamTranslate.
Start Free TrialTikTok has rolled out auto-captions on the platform, but for Live streaming specifically, the implementation is limited. As of 2026, TikTok's live caption feature is viewer-controlled (viewers turn it on themselves), English-centric, not available in all regions, and not configurable by the streamer. You have no control over the caption appearance, accuracy, or language options — it's entirely on TikTok's backend and the viewer's device.
For a creator who wants to actively provide accessible, high-quality captions on their TikTok Live — captions that appear in the stream itself, not just optionally for some viewers — you need to add your own caption overlay. That's exactly what StreamTranslate does.
On mobile, TikTok Live is straightforward — you go live directly from the TikTok app. But most serious TikTok Live streamers use PC-based streaming via OBS, especially for gaming content, talk shows, or production setups with multiple cameras and overlays. TikTok provides an RTMP streaming key (via Live Studio or through third-party tools) that you paste into OBS. This is how you get StreamTranslate into a TikTok Live stream.
If you stream TikTok Live via mobile only, StreamTranslate is not currently applicable — it requires an OBS-based setup. For mobile TikTok Live, your options are limited to the platform's native caption feature.
In your TikTok creator dashboard or Live Studio app, find your RTMP server URL and stream key. Enter these in OBS Settings → Stream → Custom RTMP. This connects OBS to your TikTok Live channel.
Go to streamtranslate.live/setup and start your free trial. This takes about 60 seconds.
After setting up your StreamTranslate account, you'll receive a unique browser source URL. Copy this URL — you'll paste it into OBS.
In OBS, in your scene, click the + button, select "Browser Source," name it "StreamTranslate Captions," paste your URL, and set the width and height to match your stream resolution. Position the browser source at the bottom of your frame.
Click "Start Streaming" in OBS. Your TikTok Live is now active with captions appearing as part of the video — visible to all viewers on any device, without any viewer action required.
Unlike platform-generated captions that require viewer action to enable, burned-in caption overlays via StreamTranslate appear automatically for everyone. On TikTok specifically, where viewers scroll rapidly and default to muted playback, having captions already in the video dramatically increases the chance that a passing viewer stops and watches.
This is especially important for TikTok's mobile-first audience. Many viewers are in public, on commutes, or in environments where they can't use audio. A TikTok Live stream with visible captions retains these viewers; a stream without captions loses them immediately.
TikTok's audience is among the most internationally diverse of any platform. With StreamTranslate, you can translate your English TikTok Live captions into Spanish, Portuguese, Japanese, Korean, or any of 50+ languages. This is particularly powerful for TikTok, where content regularly goes viral in unexpected international markets. If your TikTok Live blows up in Brazil, Spanish-speaking viewers can follow it — if you have StreamTranslate translation active.
TikTok Live from OBS is typically streamed at 1080x1920 (vertical/portrait) for the mobile viewer experience. Configure your OBS canvas to 1080x1920 and size your StreamTranslate browser source accordingly. Position captions at the bottom of the vertical frame — approximately in the bottom 20% of the 1920px height. Font size should be large enough to be readable on a mobile screen (equivalent to 30-40pt at 1080px width).
TikTok has viewer-side auto-captions in some regions, but they're not controllable by the streamer and aren't available to all viewers. For captions burned into your stream video, use OBS + StreamTranslate.
StreamTranslate requires OBS, which is a desktop application. Mobile TikTok Live doesn't support OBS-based overlays. For mobile TikTok Live, you're limited to TikTok's native viewer-side caption feature.
TikTok Live is consumed on mobile in portrait format. Set your OBS canvas to 1080x1920 and position your caption browser source in the bottom 20% of the frame for best mobile readability.
Yes. StreamTranslate captions are part of the video output from OBS — they appear for every viewer on every device, without any viewer-side action required. This is different from TikTok's own optional caption feature.
Yes. StreamTranslate translates into 50+ languages in real time. Spanish and Portuguese are both supported — ideal for TikTok's large Latin American viewer base.
In your TikTok Creator tools or the TikTok Live Studio app, find your stream settings. The RTMP server URL and stream key are typically in the Live Studio settings or through TikTok's live creator support tools.