SubStudio: Free Open-Source AI Subtitle Generator With Whisper and 6 Preset Styles

GitHub·low signal

Hassan (Nutlope) released SubStudio, a free open-source tool that generates and embeds subtitles into any video in seconds using Together AI's Whisper Large v3 model with word-level timestamps. It auto-merges short intervals into readable subtitle blocks, offers 6 preset styling options with real-time preview, and exports as .srt, .vtt, or burned-in .mp4. Built with FFmpeg via fluent-ffmpeg, it requires only a Together AI key to run — no subscriptions or per-video fees.