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About Auto Subtitle Generator
Auto Subtitle Generator — free, private, browser-based subtitle tool
Turn any video or audio into subtitles (SRT/VTT) automatically — in your browser. It takes MP4, WEBM, MPEG, WAV, MP4, OGG and gives you X-SUBRIP, VTT. It runs in your browser, so the file is processed on your own device.
Why use Auto Subtitle Generator
- ·Files stay on your device — nothing is uploaded
- ·No signup needed
- ·Works in any modern browser, on any OS
- ·Free daily use; Pro removes limits and watermarks
How to use it
- 1Drop a MP4, WEBM, MPEG, WAV, MP4, OGG file on the page, or click to choose one.
- 2Pick the options you want.
- 3Download the X-SUBRIP, VTT file.
What Auto Subtitle Generator does
Turn any video or audio into subtitles (SRT/VTT) automatically — in your browser. The result is a X-SUBRIP, VTT file you download directly.
How it works
Whisper via transformers.js with quantized models that fit the on-device budget; ffmpeg.wasm for burn-in. The processing code runs inside the page, so your file is not uploaded to a server — you can confirm this in your browser's DevTools → Network tab.
Frequently asked questions
Does Auto Subtitle Generator upload my files?+
No. Auto Subtitle Generator runs in your browser and processes the file on your device. Nothing is sent to our servers.
Is Auto Subtitle Generator free?+
Yes, with a daily free allowance and no signup. Xonvert Pro ($4.99/month) removes the daily limits and the watermark on exported files.
Do I need to install anything?+
No. It works in any modern browser on Windows, macOS, Linux, ChromeOS, Android and iPad.
Related subtitle tools
Character Counter
Count characters per line and per second — flag cues that read too fast.
Clean & Normalize
Strip music notes, normalize quotes, fix common subtitle clutter.
FPS Converter
Re-time subtitles when the video frame rate changes — 23.976 ↔ 25, etc.
Merge
Combine two subtitle files end-to-end with optional offset.
Split at Time
Cut a subtitle file in two at a chosen timestamp.
Style Editor
Add bold, italic, or color tags to every cue at once.