AI Speech to Text — Video & Audio Transcription
This tool transforms any video or audio file into accurate text transcriptions with precise timestamps, generating professional SRT subtitle files — all processed locally in your browser with zero uploads to any server.
Why Use a Local Transcription Tool?
Uploading a 2GB video to cloud-based AI tools wastes bandwidth and time. Our tool reads files directly from your device's storage, making it significantly faster. Your media never leaves your computer, ensuring complete privacy for sensitive content like business meetings, legal recordings, or personal videos.
Key Features
- No file size limit — Process videos of any size directly from your device
- SRT/VTT subtitle generation — Create timestamped subtitle files compatible with YouTube, social media, and video editors
- Dual AI models — Choose Tiny (~75MB) for speed or Small (~250MB) for higher accuracy
- 99 language support — Auto-detect or manually select from Arabic, English, Spanish, Chinese, and more
- Bulk processing — Transcribe up to 20 files per batch with individual progress tracking
- Zero browser freeze — AI runs in a Web Worker on a separate thread
- Multiple output formats — SRT, VTT, or plain text
How It Works
The tool uses a two-stage pipeline:
- Audio extraction — FFmpeg.wasm extracts the audio track from your video file and converts it to 16kHz mono WAV format, optimized for speech recognition.
- AI transcription — OpenAI's Whisper model (running via Transformers.js in a Web Worker) analyzes the audio and produces timestamped text segments, which are formatted into your chosen output format.
Use Cases
- Content creators — Generate SRT subtitles for YouTube videos, TikTok, Instagram Reels, and podcasts
- Journalists — Transcribe interviews and press conferences for articles
- Students — Convert lecture recordings into searchable text notes
- Businesses — Transcribe meetings, webinars, and training videos
- Accessibility — Create captions for deaf and hard-of-hearing viewers
Supported Formats
Video: MP4, MKV, MOV, AVI, WebM, FLV. Audio: MP3, WAV, OGG, FLAC, AAC, M4A. The tool accepts any format that FFmpeg can process.
Privacy & Security
This tool runs entirely in your browser using WebAssembly technology. No video or audio data is sent to any server. The AI model downloads once and is cached locally for future visits. Your files stay on your device at all times.
Browser Compatibility
Works in all modern browsers: Chrome, Firefox, Edge, Safari, Opera, and Brave. Mobile browsers are supported but desktop is recommended for processing large files. WebAssembly and Web Workers are required (supported by 97%+ of browsers globally).
Tips for Best Results
- Use the Small model for non-English audio or recordings with background noise
- Select the language manually if auto-detect picks the wrong language
- For very long videos (1+ hours), processing may take several minutes — the browser tab must stay open
- Clear audio with minimal background noise produces the most accurate transcriptions