About
Captions for every creator, in every language.
SubFlow Studio is a free online tool that turns the speech in your videos into styled, perfectly-timed captions — and translates them so your content can reach audiences around the world.
What SubFlow does
- Automatically detects the spoken language and transcribes your video with word-level timing using OpenAI Whisper.
- Translates captions into 118+ languages with AI while keeping the original timing.
- Offers six caption styles — Bold Pop, Karaoke, Cyber Neon, Boxed, Classic and Minimal — plus full control over fonts, colours, size and position.
- Exports a finished MP4 with captions burned in, or SRT / VTT subtitle files for YouTube, Vimeo and editing software.
Why we built it
Most people watch social videos with the sound off, and billions of viewers don't speak the language a video was recorded in. Captions fix both problems — but making them by hand is slow. SubFlow makes it a one-minute job, without needing an account or editing software.
How it's funded
SubFlow is free to use. It's supported by advertising from Google AdSense.