Key Statistics
Whisper model - 95%+ transcription rate AI accuracy
SRT & VTT with timestamps Export formats
YouTube, TikTok, HTML5 video compatible Platform support
Generate Subtitles with AI — Free SRT & VTT Export
Upload a video or audio file to automatically generate timestamped subtitles using OpenAI's Whisper AI. Choose from 10+ languages, then export as SRT for video editors or VTT for web players. Preview subtitles synced with video playback. All processing runs in your browser—your media never uploads to any server.* Uses Whisper AI - runs entirely in your browser
* First use downloads ~150MB model (cached after)
* SRT format for video editors, VTT for web players
What is Subtitle Generator?
Subtitle Generator is a free browser-based tool that creates timestamped subtitles from video or audio files using OpenAI's Whisper AI. It outputs industry-standard SRT and VTT formats compatible with all major video players and editing software. The AI runs entirely on your device for complete privacy.
Perfect for creating captions for YouTube videos, adding subtitles to presentations, or making content accessible to deaf and hard-of-hearing viewers.
How does Subtitle Generator work?
- 01 Drag and drop a video or audio file (MP4, WebM, MOV, MP3, WAV, M4A)
- 02 Select the language of the spoken content
- 03 Click "Generate Subtitles with AI" to begin processing
- 04 Preview the subtitles synced with video playback (for video files)
- 05 Download as SRT for video editors or VTT for web players
Why use a browser-based tool?
- Complete privacy: Media never leaves your device—AI runs locally
- Industry formats: Export SRT (universal) or VTT (web standard)
- Live preview: See subtitles synced with video before downloading
- Multi-language: Supports English, Spanish, French, German, and more
- No limits: Generate subtitles for as many files as you want
Common Questions
What is the difference between SRT and VTT formats?
SRT (SubRip) is the most widely supported format, compatible with virtually all video editors and players. VTT (WebVTT) is the web standard used by HTML5 video players and supports additional styling. For YouTube uploads, use SRT. For websites, use VTT.
How accurate are the generated subtitles?
Accuracy depends on audio clarity. Clear speech with minimal background noise achieves 90%+ accuracy. The Whisper model handles accents well but may need manual corrections for heavy noise, overlapping speakers, or technical terminology.
Can I edit the subtitles after generation?
Currently, subtitles cannot be edited directly in the tool. Download the SRT or VTT file and edit it in any text editor—the format is human-readable. You can adjust timing and text as needed.
Why is the first generation slow?
The first use downloads the Whisper Tiny AI model (~150MB). This is cached by your browser for future use. Subsequent generations start much faster. Longer media files also require more processing time.
What languages are supported for subtitle generation?
English, Spanish, French, German, Italian, Portuguese, Chinese, Japanese, Korean, and Russian are currently supported. The AI automatically transcribes speech in the selected language.