How to Auto-Generate Subtitles with AI (Under 2 Minutes)

Subtitling used to mean typing while scrubbing a timeline. Now AI transcription does in seconds what took an hour — here's exactly how the process works and how to get the cleanest results from it.

What happens under the hood

1. Transcription. A speech-to-text model converts your audio into text — modern models handle accents, fast speech and multiple languages.
2. Word-level timestamps. The important part: each word gets its own start and end time, not just each sentence. This is what makes karaoke-style highlights possible.
3. Styling & rendering. The tool lays the words out in a caption style (font, colors, animation, emojis) and burns them into the video frame by frame.

Doing it with Subsio

1. Open the create page and drag in your MP4/MOV (vertical 9:16 is ideal).
2. The AI transcribes and syncs every word automatically.
3. Pick a style, adjust size/position if you like, and preview it live.
4. Download the finished video — typically under 2 minutes end to end.

Tips for maximum accuracy

• Clean audio in, clean captions out. Loud background music mixed over quiet speech is the #1 cause of transcription errors.
• Speak naturally, not fast. Rapid-fire mumbling challenges any model.
• Skim the result. AI gets names and niche jargon wrong sometimes — a 20-second read-through catches it.

Languages

Subsio supports English, Polish, Spanish, French and more — upload in the language you speak and the captions come back in it.

Try it now

The free plan includes 5 videos a month. Upload a clip and you'll have a captioned version before your coffee cools.