An AI subtitle generator listens to a video and writes time-coded captions for it automatically. Vivideo detects the speech, transcribes it, splits it into readable on-screen lines, and times each one to the audio — so you get clean subtitles to burn in or download as SRT/VTT in minutes, across 30+ languages, free to start.
How to add subtitles
Upload your video
Any format, any length — or paste a link.
AI writes the captions
Speech is transcribed and split into clean lines.
Lines are auto-timed
Each caption is timed to the audio precisely.
Burn in or export
Style and burn captions, or download SRT/VTT.
What the subtitle generator does
Readable captions, timed for you.
| Capability | What it does |
|---|---|
| Auto-timed lines | Every caption is synced to the speech automatically. |
| 30+ languages | Caption in dozens of languages, auto-detected. |
| Burn-in or file | Style captions onto the video, or export SRT/VTT. |
| Readable splits | Long sentences are split into clean, skimmable lines. |
| Free, no watermark | Start free; captions ready for any platform. |
How AI subtitle generation works
An AI subtitle generator turns the speech in a video into time-coded captions automatically. It transcribes the audio, breaks the text into short on-screen lines, and times each line to when the words are actually spoken — replacing the slow, manual job of typing and syncing captions by hand.
Vivideo gives you both outputs: burn-in captions you can style (font, size, colour, position) directly onto the video, and a downloadable SRT or VTT file for platforms that take their own subtitle uploads. It captions in 30+ languages with auto-detection, and the lines are split for readability rather than dumped as one long block.
Captions are no longer optional. The majority of social video is watched on mute, so subtitles are what keep viewers from scrolling past. Creators caption every reel and short, marketers caption ads for silent autoplay feeds, and teams add captions for accessibility — all from a single upload, in minutes.
For the cleanest result, start with clear audio and skim the captions before exporting; the odd proper noun or homophone is worth a quick fix. Then burn them in for social, or export the SRT to keep captions as a separate track you can edit later.
Frequently asked questions
Is the subtitle generator free?
Yes — caption your videos free to start, in your browser.
Can I download an SRT file?
Yes — export as SRT or VTT, or burn the captions straight onto the video.
How accurate are the captions?
Very accurate on clear audio; you can fix any word before exporting.
What languages can it caption?
30+ languages, auto-detected — English, Spanish, Hindi, Arabic, Japanese and more.
Can I style the captions?
Yes — choose fonts, size, colour and position before you burn them in.
Will there be a watermark?
No — your captioned exports are clean, ready to publish.
