AI video caption
generator.
Upload a video, get word-level AI timing, fix the transcript, and export captions that are ready for the feed or the player.
5 minutes free · No credit card · Word-level timing
Upload
Drop in an MP4, MOV, or supported video file.
Edit
Correct names, numbers, and timing in the transcript.
Export
Download a styled MP4 or a timed SRT/VTT file.
One transcript, two caption deliveries
The best workflow is to generate captions once, then choose the delivery that matches the destination. Use a burned-in MP4 when every viewer needs to see the words immediately. Use SRT or VTT when the player should let viewers toggle captions, change language, or adjust the text.
| Export | Best for | Trade-off |
|---|---|---|
| Burned-in MP4 | TikTok, Reels, Shorts, X, LinkedIn | Always visible, but not toggleable |
| SRT / VTT | YouTube, Vimeo, courses, web players | Accessible and flexible, but player support varies |
Captions that survive the feed.
- Word-level timing instead of slow sentence blocks
- Readable presets for bright, busy, and vertical video
- Burned-in MP4 export that works after cross-posting
- Transcript editing before you publish
Start with your destination.
Frequently asked
What is an AI video caption generator?+
It transcribes the speech in a video, syncs each word to the audio, and turns the transcript into captions you can edit and export. SoCaptions can render captions into an MP4 for social video or keep them as an SRT/VTT sidecar file.
Can I add captions to an MP4 online?+
Yes. Upload the MP4, review the generated transcript, choose a caption style, and export a new MP4 with the captions permanently rendered into the video. Keep the original file so you can make another language or style later.
Does SoCaptions export SRT files too?+
Yes. Use the editor to review the word-level transcript and export a timed caption file when you need YouTube, Vimeo, course, or accessibility captions. Use the burned-in MP4 for feeds where captions need to be visible immediately.
Is the video caption generator free?+
You can try SoCaptions with five free minutes of transcription and no credit card. The free tier lets you test the workflow; paid plans add more transcription time and exports.
Can I use it for TikTok, Reels, and YouTube Shorts?+
Yes. Export a vertical MP4 with readable burned-in captions, then preview the result against each platform's safe zone. SoCaptions is designed for TikTok, Instagram Reels, YouTube Shorts, LinkedIn, and other short-form feeds.
Are burned-in captions the same as closed captions?+
No. Burned-in or open captions are pixels in the video and cannot be toggled off. Closed captions are a separate SRT, VTT, or platform-native track. For accessibility workflows, deliver the separate caption track as well as a burned-in social version when appropriate.
Turn your next video into a captioned MP4.
Try the full workflow with five free minutes. No card and no complicated editor.
Open the editor