Subtitle Converter — SRT/VTT/SBV 作成者: BitBleep

Convert subtitle files right in your browser — no upload, no sign-up, no data collection.

What it does:
- Convert between SRT (.srt), WebVTT (.vtt), SBV (.sbv, YouTube captions) and plain-text transcripts
- Auto-detects the input format
- Shift all timestamps by any number of seconds to fix out-of-sync subtitles
- Strip formatting/positioning tags
- Remove empty cues
- Drop in multiple files and download them all as a ZIP

Private by design:
Everything runs locally inside the popup. The extension requests no permissions, makes no network requests, and collects no data. Your subtitle files never leave your device — it even works with your Wi-Fi off.

Under the hood: the conversion engine is plain, auditable JavaScript — open the popup source and read it yourself.

More free browser tools: https://prayert.github.io/subtitle-tools/