Last updated: March 2026
How Auto Subtitles Work
Upload your video and the tool uses your browser's built-in speech recognition engine to transcribe the audio in real time. The transcription is automatically split into subtitle segments with timestamps. Edit any errors in the inline editor — click any segment to jump to that point in the video. When you're happy with the results, download as SRT for video editors or VTT for web players.
Frequently Asked Questions
How accurate is auto-transcription?
The Web Speech API provides 85-95% accuracy for clear English speech in quiet environments. Heavy accents, background music, or multiple speakers may reduce accuracy. Use the inline editor to fix any errors.
Which browsers support auto-transcription?
Chrome and Edge support the Web Speech API for auto-transcription. Firefox and Safari users can use the manual subtitle editor to type subtitles while watching the video.
What subtitle formats can I download?
SRT (SubRip — works with Premiere, Final Cut, DaVinci Resolve, YouTube), VTT (WebVTT — for HTML5 web video), and plain text transcripts without timestamps.
Can I edit subtitle timing?
Yes. Each subtitle segment has editable start and end times. You can split segments, merge adjacent ones, and add new segments at any point in the video.
Is my video uploaded anywhere?
No. All processing happens in your browser — the video never leaves your device. Speech recognition runs locally through the Web Speech API.