Every subtitle tool you need, in one focused app
From offline AI speech-to-text to automatic re-timing — built specifically for movie and TV content.
Whisper AI transcription in 90+ languages
Generate subtitles from any video's audio using state-of-the-art Whisper speech recognition, running fully offline. Accurate word timing, punctuation and speaker-friendly line breaks — English, Spanish, German, French, Dutch, Turkish, Japanese and 80+ more languages.
AI translation that keeps timing
Translate SRT and ASS/SSA files or embedded tracks into 25+ languages with DeepSeek AI, without touching the timestamps. Styling and positioning in ASS subtitles are preserved. Requires your own free DeepSeek API key and an internet connection.
Sync Subtitles — automatic synchronization
Downloaded subtitles that drift or start too late? Offline acoustic alignment matches every cue against the actual audio track, fixing linear offsets and framerate mismatches automatically.
Batch processing for entire seasons
Point the app at a folder of episodes and process them all: extract embedded tracks, transcribe missing languages, sync and export — unattended.
Embedded track extraction & OCR
Detects subtitle tracks with FFprobe, extracts them with FFmpeg or mkvextract, and converts image-based subtitles (Blu-ray SUP, DVD SUB/IDX) to editable text with OCR.
Convert between subtitle formats
Convert SRT, ASS/SSA and WebVTT to and from each other, plus 30+ legacy formats — TTML/DFXP, SAMI, MicroDVD, SubViewer, SCC, MPL2 and more — with automatic character-encoding detection so old subtitle packs come out as clean UTF-8.
Automatic cleanup & repair
Fix character-encoding mojibake, strip SDH/hearing-impaired annotations, correct common OCR mistakes and repair malformed subtitle files in a single, instant, fully offline pass.
Built-in subtitle editor
Edit text and timing side by side with video preview, then export to SRT, ASS/SSA or WebVTT for any player or device.
Private & offline by default
No cloud uploads, no accounts, no per-minute costs. Transcription, syncing, extraction and cleanup run entirely on your own hardware on Windows and macOS (Apple Silicon & Intel) — only the optional AI translation feature calls the cloud, using your own API key.
Supported formats
| Text subtitles | SRT (SubRip), ASS/SSA (Advanced SubStation, styling preserved), WebVTT, plus 30+ legacy formats (TTML/DFXP, SAMI, MicroDVD, SubViewer, SCC, MPL2 and more) — all convertible to and from SRT |
|---|---|
| Image subtitles | Blu-ray SUP, DVD SUB/IDX — extracted and OCR-converted to SRT |
| Video containers | MKV, MP4, AVI, MOV and anything else FFmpeg can read |
| Languages | 90+ languages for transcription (offline), 25+ languages for AI translation (DeepSeek, cloud) |
| Platforms | Windows 10/11 · macOS (Apple Silicon & Intel) |