SubForge — Auto Subtitle Generator

Generate subtitles without uploading your files anywhere.

SubForge is a free Windows desktop tool that automatically generates subtitles from any video or audio file using Whisper AI — fully offline, no account required, no watermark.

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Features

AI transcription — three models
Whisper Base (CPU, fastest) · Whisper Medium (balanced) · Whisper Large-v3 (best accuracy)
All models run locally. Your files never leave your machine.

Batch queue
Add multiple files and process them in sequence. MP4, MKV, AVI, MOV, MP3, WAV, FLAC, AAC supported.

Subtitle editor
Edit any segment inline. Waveform visualization with playhead. Merge, split, search. Confidence score per segment.

Export formats
SRT · VTT · ASS/SSA · TXT
Compatible with DaVinci Resolve, Premiere Pro, Final Cut Pro, YouTube.

99+ languages
Auto-detect or select manually. Optional auto-translate to English.

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Why desktop

Cloud subtitle tools upload your videos to someone else's server. SubForge transcribes everything locally — interviews, client work, private recordings stay on your machine. No file size limits, no processing timeouts, no monthly fee.

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System requirements

Windows 10 / 11 (64-bit)
4 GB RAM minimum · 8 GB recommended
GPU optional — Whisper Base runs on CPU
2 GB+ VRAM for Medium · 4 GB+ for Large-v3
~2 GB storage for models

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Free to download and use. Tips help keep it updated as new Whisper models release.