What it does
- Turn microphone speech into live captions, up to three translations, and a movable chroma-key overlay for OBS.
- Available results: live captions, up to three translations, and an OBS overlay.
Realtime caption translator
Create live microphone captions and an OBS-friendly chroma key subtitle screen.
Files are not uploaded to a server. Selected files and results are processed only inside your browser.
Chroma key caption screen
Use the green background as a chroma key in OBS Browser Source and show only the captions.
Recognized speech captions will appear here.
ReadyPress Start microphone to begin speech recognition.
Speech and translation
Speech recognition uses the browser Web Speech API. Translation runs in the browser when Chrome's built-in Translator API is available.
Browser readiness check
Check the browser features required before a live session.
Secure HTTPS contextChecking
Speech recognition APIChecking
Microphone access APIChecking
Built-in Translator APIChecking
Word replace and sentence handling
Enter 0 to disable auto-clear or silence-based sentence splitting. Defaults are clear 8000ms and split 900ms.
Caption style
Caption session history
Finalized captions are kept in this tab and can be exported as subtitle files.
Finalized captions will appear here after speech recognition starts.
Save settings and create launch files
About Realtime caption translator
This workspace is focused on one concrete browser task rather than a generic converter.
Recommended workflow
- Start with a permitted microphone and selected languages and keep the original separately.
- Review the preview, dimensions, page count, timing, or file size shown by this tool before downloading.
Known browser limits
- Recognition and translation depend on browser APIs, microphone permission, language support, and sometimes network services.
Where processing happensThe input is handled by the browser's speech-recognition and translation APIs. FreeToolHub does not send the selected files, names, captions, or values to its own upload server.
Practical Tool Guides
Short guides for common browser-based file, image, GIF, PDF, and privacy workflows.
What browser-only tools can and cannot keep private
A practical privacy guide for local file tools, browser permissions, and third-party browser services.
How to set up live translated captions for OBS
A practical setup sequence for microphone recognition, translated caption lines, chroma key, Browser Source, and subtitle exports.
Set up a browser broadcast overlay in OBS
Prepare lower thirds, tickers, timers, and scores in FreeToolHub, then capture the overlay window cleanly in OBS.
Realtime caption translator questions
Answers about this tool's real output, limitations, and local processing.
What is Realtime caption translator designed to do?
Turn microphone speech into live captions, up to three translations, and a movable chroma-key overlay for OBS.
What can Realtime caption translator produce?
Available results: live captions, up to three translations, and an OBS overlay.
What can prevent Realtime caption translator from working?
Recognition and translation depend on browser APIs, microphone permission, language support, and sometimes network services.
Where does Realtime caption translator process the input?
The input is handled by the browser's speech-recognition and translation APIs. FreeToolHub does not send the selected files, names, captions, or values to its own upload server.
Related tools
More tools built around the same local-processing approach.
Utility ToolsAvailable
Broadcast control studio
Run overlays, match scoreboards, cue logs, and optional local OBS scene control in one workspace.
Utility ToolsAvailable
Live stream roulette picker
Run a visible marble-style winner draw for streams, events, and giveaways.
Social Media ToolsAvailable
Thumbnail studio
Design YouTube, Open Graph, Instagram, story, and social thumbnails with templates, images, and text effects.