youtube shorts caption generator

Generate captions for YouTube Shorts videos

Turn speech into timed, styled subtitles for vertical Shorts and podcast clips. Use SubtitleRocket to caption vertical clips for Shorts-style viewing in a browser editor. Review each caption line, try a visual template, and export captioned MP4 clips with social subtitle templates. You can download a watermarked result for free before choosing Pro or Max.

Open the editorBrowse tools

Drop a video here

MP4, MOV, or WebM · up to 15 min free

Your video stays in the browser. Only the extracted audio is sent for transcription.

Free: 720p MP4 with a small watermark, 90 transcription minutes/month, no signup to start. Pro from $7/month: clean 1080p, SRT/VTT export. Your video file never leaves the browser - only the extracted audio is sent for transcription.

Best for
  • podcast highlights
  • educational Shorts
  • quick republishing from longer videos
Not built for
  • writing YouTube titles or descriptions
  • YouTube channel management
  • automatic uploads
How it works
Inputs: MP4 video, MOV video, WebM video, spoken audio inside the uploaded clip.
Outputs: captioned MP4 clips with social subtitle templates, editable caption segments, free 720p watermarked download, 1080p clean export with a membership.
  1. Upload an MP4, MOV, or WebM file. The editor opens without forcing an account first.
  2. Use SubtitleRocket to caption vertical clips for Shorts-style viewing, then review the generated caption lines.
  3. Adjust wording, timing, and visual style before exporting.
  4. Download captioned MP4 clips with social subtitle templates. Free exports include a small watermark; clean exports need a membership.

Before exporting a vertical clip, check the YouTube Shorts caption safe zone.

What you get
Concrete inputs, outputs, and export limits for this workflow.
AreaDetails
InputMP4 video, MOV video, WebM video, spoken audio inside the uploaded clip
Editable resultGenerated caption segments that can be corrected before export
Free export720p captioned MP4 with a small watermark
Clean export1080p no-watermark MP4 with a Pro or Max membership
Best format fitcaptioned MP4 clips with social subtitle templates

FAQ

You can open the editor, generate captions, edit text, preview styles, and export with a watermark for free. A clean no-watermark 1080p export needs a Pro or Max membership.

No. You can start in the editor first. Sign in with a one-time email code when you want a membership, account recovery, or a clean export.

SubtitleRocket is built for MP4, MOV, and WebM short clips up to 15 minutes. The workflow is tuned for TikTok, Reels, Shorts, podcast clips, and talking-head videos.

Yes. Generated caption lines are editable, and you can switch visual templates before downloading the final video.

It generates timed subtitles that appear inside the video. It does not write the Short title, post description, or hashtags. You can edit the spoken words, choose a caption style, and export the finished vertical MP4.

Upload the vertical clip, generate captions from the speech, correct any names or numbers, keep the text clear of YouTube interface controls, then export the captioned MP4 and upload it to Shorts.

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