Auto Subtitle Generator

About Auto Subtitle Generator

This tool automatically generates subtitles from video files using AI-powered speech recognition. It runs entirely in your browser using WebAssembly technology, ensuring your videos remain private and never leave your device.

How does it work?

The tool extracts audio from your video, then uses OpenAI's Whisper AI model (running locally in your browser via WebAssembly) to transcribe speech into text with timestamps. Finally, it formats the transcription into industry-standard SRT or VTT subtitle files.

What video formats are supported?

MP4, WebM, and MOV video formats are supported. The maximum file size is 500MB to ensure smooth processing in the browser.

Which AI model should I choose?

Tiny is fastest and works well for clear speech. Base offers a good balance of speed and accuracy. Small is most accurate but slower and requires more memory. Start with Tiny for testing.

What's the difference between SRT and VTT?

SRT (SubRip) is the most widely supported format, compatible with most video players and platforms. VTT (WebVTT) is the web standard, used for HTML5 video and supports advanced styling. Both contain the same timing and text information.

Is my video uploaded to a server?

No. All processing happens locally in your browser using WebAssembly. Your video never leaves your device, ensuring complete privacy.