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Generate Viral Subtitles in Minutes

Upload your video, get AI-powered animated captions, and download instantly.
100% free, no watermarks.

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Step 1: Upload Video

Drop your video here or click to browse

Supports MP4, MOV, AVI, WebM, FLV (max 500MB)

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100% Free

No hidden fees, no watermarks

AI-Powered

Automatic transcription with OpenAI

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Get your video in minutes

Free Online Subtitle Generator — Add Captions to Your Video Fast

Need subtitles for TikTok, Reels, Shorts, or YouTube? ShortGen’s free subtitle generator lets you upload a video, auto-transcribe speech to text, and export a subtitled video with viral, animated captions. It works in the browser, supports popular formats (MP4, MOV, WEBM), and delivers clean results without watermarks.

Subtitles improve watch time, accessibility, and engagement. With our AI-powered transcription and multiple subtitle styles, you can highlight key words, match your brand, and keep viewers hooked — all in minutes.

Why creators use ShortGen

  • Automatic speech-to-text powered by AI (fast and accurate)
  • Viral styles (TikTok karaoke, colored words, animated backgrounds)
  • No watermarks — download-ready videos for any platform
  • Works with common video formats and short-form dimensions
  • Free usage with fair daily limits (more when signed in)

How to add subtitles to a video

  1. Upload your clip (MP4, MOV, or WEBM).
  2. Click “Upload & Transcribe” to generate captions automatically.
  3. Edit any lines of text directly if needed.
  4. Choose your favorite subtitle style.
  5. Render and download your video with captions.

FAQ

Is this subtitle tool really free?

Yes. It’s free with a daily limit per IP. Sign in to increase your daily allowance.

Are there watermarks?

No watermarks. Your exported video is ready for TikTok, Reels, or Shorts.

Which video formats are supported?

MP4, MOV, and WEBM work great. Keep clips under ~10 minutes for best results.

Pro tips

  • Use bold, high-contrast captions to boost retention.
  • Keep lines short (3–5 words) for mobile readability.
  • Match your brand colors with our subtitle styles.
Try ShortGen video toolsLearn more on our blog