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Watch the quick demo, then follow the steps below.

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Quick start: See how to add original, translated, or bilingual subtitles to a video.

Add Subtitles to Video with AI: Original, Translated & Bilingual Subtitles

Add original, translated, or bilingual subtitles to your video in one workflow. QuantumSubtitle combines AI speech recognition, translation, and customizable subtitle styling, then exports a share-ready subtitled video.

How to Add Subtitles to a Video with AI​

Upload a video or audio file, choose the source and target languages, and select bilingual or translated-only subtitles. The tool generates and styles the subtitles together, then exports a subtitled video ready to share.

Perfect for:

  • Content Creators: Add subtitles to YouTube videos, social media content
  • Educators: Create multilingual educational materials
  • Businesses: Localize training videos and presentations
  • Entertainment: Add subtitles to movies, shows, and documentaries

Key Features​

  • Bilingual or translation-only subtitles in a single pass
  • Works with video and audio (audio inputs are exported as a subtitled video)
  • Auto-detect source language, or set it manually
  • Customizable subtitle style: size, color, and on-screen position
  • Professional output: High-quality subtitled videos ready for sharing

How it works​

Follow these simple steps to create subtitled videos:

  1. Upload your file: Select the video or audio you want to subtitle. Supported formats include MP4, AVI, MOV, MP3, WAV, and more.

  2. Choose the source language: Keep "Auto Detect" in most cases for automatic language identification, or manually select the source language for better accuracy.

  3. Pick the target language: Select your desired target language for translation. We support over 100 languages worldwide.

  4. Adjust subtitle settings (optional):

    • Customize subtitle size, color, and position
    • Choose between bilingual or translation-only subtitles
    • Set subtitle timing and appearance preferences

  5. Start and download: Click "Start/Generate" to begin processing. Wait for completion, then download your professionally subtitled video.

Tips for best results​

  • Clear Audio Quality: Use clear, high-quality audio to improve recognition accuracy
  • Single Language: For optimal results, use content primarily in one language
  • Appropriate Volume: Ensure speech volume is adequate for recognition
  • File Format: Use common video formats (MP4, AVI, MOV) for best compatibility
  • Subtitle Positioning: Adjust subtitle position to avoid covering important visual content

Start adding subtitles​

Use the production tool here: Add subtitles to video online.

Related reading: How to add bilingual subtitles to a video online.